阅读说明：本技术 一种有机酸清洗剂及其制备方法 (Organic acid cleaning agent and preparation method thereof ) 是由 余莉 周林超 艾山·玉素莆 于 2020-12-25 设计创作，主要内容包括：本发明提供了一种有机酸清洗剂及其制备方法,有机酸清洗剂主要由按重量份数计的以下原料制得：柠檬酸20-25份、羟基乙酸4-6份、甲酸2-3份、缓蚀剂1-2份、清洗促进剂0.5-2份、螯合剂0.1-1份、渗透剂0.2-0.6份和适量去离子水。本发明的清洗剂适用于化工设备表面上的污垢,通过使用本发明中的有机酸清洗剂将设备表面的污层剥离、浸润、分散、溶解、螯合至清洗液中,以达到清洗的目的,本发明有机酸清洗剂是一种弱酸清洗剂,对化工设备及管道腐蚀性小同时能够有效去除锈蚀产物,安全环保,保证设备的传热效果,延长设备的使用寿命,清洗后能够保证设备长时间运行且不会结垢。(The invention provides an organic acid cleaning agent and a preparation method thereof, wherein the organic acid cleaning agent is mainly prepared from the following raw materials in parts by weight: 20-25 parts of citric acid, 4-6 parts of glycolic acid, 2-3 parts of formic acid, 1-2 parts of corrosion inhibitor, 0.5-2 parts of cleaning promoter, 0.1-1 part of chelating agent, 0.2-0.6 part of penetrating agent and a proper amount of deionized water. The organic acid cleaning agent is a weak acid cleaning agent, has small corrosivity on chemical equipment and pipelines, can effectively remove corrosion products, is safe and environment-friendly, ensures the heat transfer effect of the equipment, prolongs the service life of the equipment, and can ensure long-time operation of the equipment after cleaning without scaling.)

1. The organic acid cleaning agent is characterized by being mainly prepared from the following raw materials in parts by weight: 20-25 parts of citric acid, 4-6 parts of glycolic acid, 2-3 parts of formic acid, 1-2 parts of corrosion inhibitor, 0.5-2 parts of cleaning promoter, 0.1-1 part of chelating agent, 0.2-0.6 part of penetrating agent and a proper amount of deionized water.

2. The organic acid cleaning agent according to claim 1, wherein the cleaning agent comprises 21 to 24 parts of citric acid, 4.5 to 5.5 parts of glycolic acid, 2.2 to 2.8 parts of formic acid, 1.2 to 1.8 parts of corrosion inhibitor, 0.6 to 1.8 parts of cleaning accelerator, 0.3 to 0.8 part of chelating agent and 0.2 to 0.6 part of penetrating agent.

3. The organic acid cleaning agent according to claim 1, wherein the cleaning agent comprises 22 to 23.5 parts of citric acid, 4.8 to 5.2 parts of glycolic acid, 2.4 to 2.6 parts of formic acid, 1.4 to 1.6 parts of corrosion inhibitor, 0.8 to 1.2 parts of cleaning accelerator, 0.4 to 0.6 part of chelating agent and 0.3 to 0.5 part of penetrating agent.

4. The organic acid cleaning agent according to claim 1, wherein the cleaning agent comprises 23 parts of citric acid, 5 parts of glycolic acid, 2.5 parts of formic acid, 1.5 parts of corrosion inhibitor, 1 part of cleaning accelerator, 0.5 part of chelating agent and 0.4 part of penetrating agent.

5. The organic acid cleaning agent according to any one of claims 1 to 4, wherein the cleaning accelerator is one or both of sodium fluoride and potassium fluoride.

6. The organic acid cleaning agent according to any one of claims 1 to 4, wherein the chelating agent is one or both of ethylenediaminetetraacetic acid and nitrilotriacetic acid.

7. The organic acid cleaning agent according to any one of claims 1 to 4, wherein the penetrating agent is one or more of ammonium citrate, sodium dodecyl sulfonate and dodecyl betaine.

8. The organic acid cleaning agent according to any one of claims 1 to 4, wherein the corrosion inhibitor is mainly prepared from the following raw materials: 30-50 parts of oleoyl sarcosine sodium, 20-30 parts of 2-mercaptobenzothiazole, 15-30 parts of ethylene glycol, 5-15 parts of initiator, 20-30 parts of deionized water, 15-25 parts of polyethylene polyamine, 5-15 parts of acrylic acid and 3-6 parts of iron ion stabilizer.

9. The organic acid cleaning agent according to claim 8, wherein the initiator is one or two of potassium persulfate and ammonium persulfate, and the polyethylene polyamine is one or more of diethylenetriamine, tetraethylenepentamine and hexaethyleneheptamine.

10. A method for producing an organic acid cleaning agent according to any one of claims 1 to 9, comprising the steps of:

(A) mixing and stirring citric acid, glycolic acid and formic acid uniformly to obtain a first mixture;

(B) stirring the first mixture and a chelating agent, and fully dissolving to obtain a second mixture;

(C) adding the corrosion inhibitor, the cleaning accelerant and the penetrating agent into the second mixture, and uniformly stirring.

Technical Field

The invention relates to the technical field of water treatment agents, in particular to an organic acid cleaning agent and a preparation method thereof.

Background

In the running process of the circulating water cooling system, although conventional treatment is carried out, due to the difference of field conditions and system characteristics, the conditions of system scaling, oil stain, microorganism breeding and the like still commonly exist in cooling equipment and pipelines, so that insoluble scale substances are formed, the structures of the substances are compact and hard, and if the substances are not removed, on one hand, the heat conductivity coefficient of chemical equipment is reduced, the heat transfer effect is seriously influenced, and the energy waste is caused; on the other hand, the scale-insoluble substances can reduce the size of the heat exchanger and the system pipeline, reduce the water flux and increase the water flow resistance, so that the cooling effect of the system is reduced, and unnecessary loss is caused to the production. Therefore, the research on the descaling of the heat exchange equipment is increasingly paid attention by people. The descaling of the heat exchange equipment can be divided into physical descaling and chemical descaling according to the principle. The current physical descaling technology cannot well remove the dirt on the heat exchange surface, particularly the scale and rust; compared with physical descaling, the descaling rate of the chemical cleaning technology is higher.

However, the chemical cleaning agents currently on the market mainly have the following disadvantages:

1. the corrosiveness of the inorganic acid to metal materials is still large;

2. inorganic acid generates a large amount of acid mist in the cleaning process, so that the environment is polluted, and some types of inorganic acid have toxicity and great harm to human bodies;

3. most of the organic acid is weak acid, has obvious cleaning effect on dirt substances in a low pH range, has low corrosion rate on heat exchange equipment, and has limited effect on removing metal oxides.

In view of the above, the present invention is particularly proposed.

Disclosure of Invention

The first purpose of the invention is to provide an organic acid cleaning agent, which is suitable for dirt on the surface of chemical equipment, and the purpose of cleaning is achieved by stripping, infiltrating, dispersing, dissolving and chelating a dirt layer on the surface of the equipment into the cleaning agent through the organic acid cleaning agent.

The second invention aims to provide the preparation method of the organic acid cleaning agent, the preparation method is simple to operate and low in cost, and the prepared organic acid cleaning agent has the advantages of being mild, free of pollution, free of three-waste discharge, environment-friendly, safe, efficient and the like.

In order to achieve the technical purpose of the invention, the following technical scheme is adopted:

the invention provides an organic acid cleaning agent which is mainly prepared from the following raw materials in parts by weight: 20-25 parts of citric acid, 4-6 parts of glycolic acid, 2-3 parts of formic acid, 1-2 parts of corrosion inhibitor, 0.5-2 parts of cleaning promoter, 0.1-1 part of chelating agent, 0.2-0.6 part of penetrating agent and a proper amount of deionized water.

Preferably, in order to further improve the quality of the product, the organic acid cleaning agent is mainly prepared from the following raw materials in parts by weight: 21-24 parts of citric acid, 4.5-5.5 parts of glycolic acid, 2.2-2.8 parts of formic acid, 1.2-1.8 parts of corrosion inhibitor, 0.6-1.8 parts of cleaning accelerator, 0.3-0.8 part of chelating agent, 0.2-0.6 part of penetrating agent and a proper amount of deionized water.

Preferably, in order to further improve the quality of the product, the organic acid cleaning agent is mainly prepared from the following raw materials in parts by weight: 22-23.5 parts of citric acid, 4.8-5.2 parts of glycolic acid, 2.4-2.6 parts of formic acid, 1.4-1.6 parts of corrosion inhibitor, 0.8-1.2 parts of cleaning accelerator, 0.4-0.6 part of chelating agent, 0.3-0.5 part of penetrating agent and a proper amount of deionized water.

Preferably, in order to further improve the quality of the product, the organic acid cleaning agent is mainly prepared from the following raw materials in parts by weight: 23 parts of citric acid, 5 parts of glycolic acid, 2.5 parts of formic acid, 1.5 parts of corrosion inhibitor, 1 part of cleaning accelerator, 0.5 part of chelating agent, 0.4 part of penetrating agent and a proper amount of deionized water.

In the raw materials, the citric acid is weak acid, non-toxic and stable in chemical property, does not contain chloride ions per se, does not cause stress corrosion of equipment, has good solubility on indissolvable iron scale, generates an easily soluble complex, and has almost unchanged pH value from the beginning to the end of conversion into the complex, so that waste liquid is easy to treat.

The glycolic acid does not contain chloride ions, can react with iron corrosives, has extremely low corrosivity on equipment materials, does not generate organic acid iron precipitate, is particularly suitable for cleaning steel equipment, and has volatile decomposition products, no toxicity, no odor and excellent safety performance; meanwhile, the glycolic acid contains a special structure of hydroxyl and carboxyl, and can form a hydrophilic chelate with metal cations through a coordination bond, so that the compound has an obvious inhibiting effect on the growth of iron-oxidizing bacteria.

The formic acid is colorless, but has pungent odor and strong acidity, and the aqueous solution of the formic acid can react with various metals, metal oxides and metal hydroxides to generate soluble formate; the cleaning agent does not contain chloride ions, is volatile, is easy to remove residues after cleaning, and is harmless to human bodies and the environment; is suitable for cleaning stainless steel equipment and has special effect of removing some special insoluble metal oxide scales.

The corrosion inhibitor is a high-temperature acidification resistant corrosion inhibitor, and can effectively prevent or slow down the corrosion of the cleaning agent to equipment.

The cleaning accelerant shortens the time for removing oxide skin, can effectively remove silica scale, and has a special corrosion inhibition effect on magnesium-aluminum alloy.

The chelating agent is used for complexing metal and oxide scales and salt scales thereof, so that insoluble scales are converted into soluble compounds, and particularly, organic acid and the chelating agent are compounded, so that the using amount of the organic acid is effectively reduced, the corrosion rate of metal parts is reduced, and the scale removal rate is improved.

The penetrant is easy to dissolve in water, easy to wash off various greasy dirt and has excellent permeability.

As for the cleaning agent of the invention, the prior art mostly adopts inorganic acid cleaning agent, and has the defects of high corrosivity to metal, generation of a large amount of acid mist in the cleaning process and environmental pollution, and the prior art partially adopts organic acid cleaning agent, and has the defects of limited removal effect to metal oxide and poor cleaning effect, the main agent of the invention adopts citric acid, hydroxyacetic acid and formic acid, the three weak acids are nontoxic and stable in chemical property, and can effectively protect the environment, and the three types of cleaning agent can improve the cleaning effect of the pickling agent after being matched, but the defect is that the main agent adopts citric acid, hydroxyacetic acid and formic acid, and the weak acidity of the main agent, so that more stubborn stains on equipment are difficult to clean, the cleaning time is long, manpower and material resources are wasted, but a large amount of practices discover that the organic compound of the three types of cleaning agent can not only achieve good pickling effect, and the equipment is not damaged, and other weak acids are adopted for compounding in the practical process, but the effect is not as obvious as that of the three acids mixed in the invention.

In a word, the corrosion inhibitor, the cleaning accelerant, the chelating agent, the penetrating agent and the main agent are compounded, so that the effect of removing metal and metal oxide is improved, and the cleaning effect of the organic acid cleaning agent is improved.

Preferably, the corrosion inhibitor is mainly prepared from 30-50 parts of oleoyl sarcosine sodium, 20-30 parts of 2-mercaptobenzothiazole, 15-30 parts of ethylene glycol, 5-15 parts of initiator, 20-30 parts of deionized water, 15-25 parts of polyethylene polyamine, 5-15 parts of acrylic acid and 3-6 parts of iron ion stabilizer.

Preferably, the initiator is one or two of potassium persulfate and ammonium persulfate, and the polyethylene polyamine is one or more of diethylenetriamine, tetraethylenepentamine and hexaethyleneheptamine. Potassium persulfate and ammonium persulfate are soluble in water and are used for aqueous solution polymerization and emulsion polymerization, thereby increasing the reaction rate.

Preferably, the cleaning promoter is one or two of sodium fluoride and potassium fluoride. Under the acidic condition, the fluoride is converted into hydrofluoric acid, so that silicon scale is effectively removed, the fluoride has a special corrosion inhibition effect on the magnesium-aluminum alloy, and the cleaning effect of the cleaning agent is improved.

Preferably, the chelating agent is one or two of ethylenediamine tetraacetic acid and nitrilotriacetic acid. The organic acid dissolves the metal and the oxide dirt thereof, the chelating agent complexes the metal and the oxide dirt thereof and the salt dirt thereof, so that the indissolvable dirt is converted into a soluble compound, and particularly, the organic acid and the chelating agent are compounded, so that the using amount of the organic acid is effectively reduced, the corrosion rate of metal parts is reduced, and the descaling rate is also improved.

Preferably, the penetrant is one or more of ammonium citrate, sodium dodecyl sulfate and dodecyl betaine, and the addition of the penetrant can make the solution surface of the cleaning agent of the present invention oriented and make the surface tension significantly reduced, thereby prolonging the reaction time.

In addition, the invention also provides a preparation method of the organic acid cleaning agent, which comprises the following steps:

(A) mixing citric acid, glycolic acid and formic acid, adding into a stirrer, and uniformly stirring to obtain a first mixture;

(B) adding water in the proportion in the formula of the organic acid cleaning agent into the cleaning agent, adding the prepared first mixture and the chelating agent, and stirring to fully dissolve the mixture to obtain a second mixture;

(C) and finally, adding the corrosion inhibitor, the cleaning accelerant and the penetrating agent into the prepared second mixture, and fully and uniformly stirring to obtain the environment-friendly composite organic acid cleaning agent.

Compared with the prior art, the invention has the beneficial effects that:

(1) the product is organic weak acid, has small corrosivity on equipment, avoids the danger of adding inorganic acid, and is safe and environment-friendly.

(2) The product does not contain chloride ions, does not cause equipment cavitation corrosion and stress corrosion, and is suitable for large-scale equipment such as a circulating water cooling system.

(3) The product has excellent descaling effect and corrosion inhibition effect on metals and metal oxides thereof.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.

Example 1

The embodiment provides an organic acid cleaning agent, which comprises the following raw materials in parts by weight: 20 parts of citric acid, 6 parts of glycolic acid, 2 parts of formic acid, 2 parts of corrosion inhibitor, 0.5 part of cleaning promoter, 1 part of chelating agent, 0.2 part of penetrating agent and a proper amount of deionized water.

The initiator in the corrosion inhibitor is ammonium persulfate, and the polyethylene polyamine is diethylenetriamine.

The cleaning accelerator is sodium fluoride.

The chelating agent is ethylenediamine tetraacetic acid.

The penetrant is ammonium citrate.

The preparation method of the organic acid cleaning agent comprises the following steps:

(A) weighing the citric acid, the glycolic acid, the formic acid, the corrosion inhibitor, the sodium fluoride, the ethylene diamine tetraacetic acid and the ammonium citrate in parts by weight for later use;

(B) mixing the citric acid, the glycolic acid and the formic acid according to the proportion, and then adding the mixture into a variable speed stirrer to be uniformly stirred to obtain a first mixture;

(C) adding the water in the proportion into a cleaning agent preparation container, adding the prepared first mixture and the diamine tetraacetic acid in the proportion, and stirring for 2 hours to fully dissolve the mixture to obtain a second mixture;

(D) and adding the corrosion inhibitor, the sodium fluoride and the ammonium citrate in the proportion into the prepared second mixture, and fully and uniformly stirring to obtain the organic acid cleaning agent.

Experimental example 2

The embodiment provides an organic acid cleaning agent, which comprises the following raw materials in parts by weight: 25 parts of citric acid, 4 parts of glycolic acid, 3 parts of formic acid, 1 part of corrosion inhibitor, 2 parts of cleaning agent promoter, 0.1 part of chelating agent, 0.6 part of penetrating agent and a proper amount of deionized water.

The initiator in the corrosion inhibitor is ammonium persulfate, and the polyethylene polyamine is tetraethylenepentamine.

The cleaning agent accelerator is potassium fluoride.

The chelating agent is nitrilotriacetic acid.

The penetrant is sodium dodecyl sulfate.

The preparation method of the organic acid cleaning agent comprises the following steps:

(A) weighing the citric acid, the glycolic acid, the formic acid, the corrosion inhibitor, the potassium fluoride, the nitrilotriacetic acid and the sodium dodecyl sulfate in parts by weight for later use;

(B) mixing the citric acid, the glycolic acid and the formic acid according to the proportion, and then adding the mixture into a variable speed stirrer to be uniformly stirred to obtain a first mixture;

(C) adding the water in the proportion into a cleaning agent preparation container, adding the prepared first mixture and the nitrilotriacetic acid in the proportion, and stirring for 2 hours to fully dissolve the mixture to obtain a second mixture;

(D) adding the corrosion inhibitor, the potassium fluoride and the sodium dodecyl sulfate into the prepared second mixture according to the proportion, and fully and uniformly stirring to obtain the organic acid cleaning agent.

Example 3

The embodiment provides an organic acid cleaning agent, which comprises the following raw materials in parts by weight: 21 parts of citric acid, 5.5 parts of glycolic acid, 2.2 parts of formic acid, 1.8 parts of corrosion inhibitor, 0.6 part of cleaning accelerator, 0.8 part of chelating agent, 0.2 part of penetrating agent and a proper amount of deionized water.

The initiator in the corrosion inhibitor is ammonium persulfate, and the polyethylene polyamine is hexaethyleneheptamine.

The cleaning accelerator is sodium fluoride.

The chelating agent is ethylenediamine tetraacetic acid.

The penetrant is ammonium citrate.

The preparation method of the organic acid cleaning agent comprises the following steps:

(A) weighing the citric acid, the glycolic acid, the formic acid, the corrosion inhibitor, the sodium fluoride, the ethylene diamine tetraacetic acid and the ammonium citrate in parts by weight for later use;

(B) mixing the citric acid, the glycolic acid and the formic acid according to the proportion, and then adding the mixture into a variable speed stirrer to be uniformly stirred to obtain a first mixture;

(C) adding the water in the proportion into a cleaning agent preparation container, adding the prepared first mixture and the ethylenediamine tetraacetic acid in the proportion, and stirring for 2 hours to fully dissolve the mixture to obtain a second mixture;

(D) and adding the corrosion inhibitor, the sodium fluoride and the ammonium citrate in the proportion into the prepared second mixture, and fully and uniformly stirring to obtain the organic acid cleaning agent.

Example 4

The embodiment provides an organic acid cleaning agent, which comprises the following raw materials in parts by weight: 24 parts of citric acid, 4.5 parts of glycolic acid, 2.8 parts of formic acid, 1.2 parts of corrosion inhibitor, 1.8 parts of cleaning accelerator, 0.3 part of chelating agent, 0.6 part of penetrating agent and a proper amount of deionized water.

The initiator in the corrosion inhibitor is potassium persulfate, and the polyethylene polyamine is diethylenetriamine.

The cleaning accelerator is potassium fluoride.

The chelating agent is nitrilotriacetic acid.

The penetrant is dodecyl betaine.

The preparation method of the organic acid cleaning agent comprises the following steps:

(A) weighing the citric acid, the glycolic acid, the formic acid, the corrosion inhibitor, the sodium fluoride, the potassium fluoride, the nitrilotriacetic acid and the dodecyl betaine according to the parts by weight for later use;

(B) mixing the citric acid, the glycolic acid and the formic acid according to the proportion, and then adding the mixture into a variable speed stirrer to be uniformly stirred to obtain a first mixture;

(C) adding the water in the proportion into a cleaning agent preparation container, adding the prepared first mixture and the nitrilotriacetic acid in the proportion, and stirring for 2 hours to fully dissolve the mixture to obtain a second mixture;

(D) adding the corrosion inhibitor, the sodium fluoride, the potassium fluoride and the dodecyl betaine into the prepared second mixture according to the proportion, and fully and uniformly stirring to obtain the organic acid cleaning agent.

Example 5

The embodiment provides an organic acid cleaning agent, which comprises the following raw materials in parts by weight: 22 parts of citric acid, 5.2 parts of glycolic acid, 2.4 parts of formic acid, 1.6 parts of corrosion inhibitor, 0.8 part of cleaning accelerator, 0.6 part of chelating agent, 0.3 part of penetrating agent and a proper amount of deionized water.

The initiator in the corrosion inhibitor is potassium persulfate, and the polyethylene polyamine is diethylenetriamine.

The cleaning accelerator is potassium fluoride.

The chelating agent is nitrilotriacetic acid.

The penetrant is dodecyl betaine.

The preparation method of the organic acid cleaning agent comprises the following steps:

(A) weighing the citric acid, the glycolic acid, the formic acid, the corrosion inhibitor, the sodium fluoride, the potassium fluoride, the nitrilotriacetic acid and the dodecyl betaine according to the parts by weight for later use;

(B) mixing the citric acid, the glycolic acid and the formic acid according to the proportion, and then adding the mixture into a variable speed stirrer to be uniformly stirred to obtain a first mixture;

(C) adding the water in the proportion into a cleaning agent preparation container, adding the prepared first mixture and the nitrilotriacetic acid in the proportion, and stirring for 2 hours to fully dissolve the mixture to obtain a second mixture;

(D) adding the corrosion inhibitor, the sodium fluoride, the potassium fluoride and the dodecyl betaine into the prepared second mixture according to the proportion, and fully and uniformly stirring to obtain the organic acid cleaning agent.

Example 6

The embodiment provides an organic acid cleaning agent, which comprises the following raw materials in parts by weight: 23.5 parts of citric acid, 4.8 parts of glycolic acid, 2.6 parts of formic acid, 1.4 parts of corrosion inhibitor, 1.2 parts of cleaning promoter, 0.4 part of chelating agent, 0.5 part of penetrating agent and a proper amount of deionized water.

The initiator in the corrosion inhibitor is potassium persulfate, and the polyethylene polyamine is diethylenetriamine.

The cleaning accelerator is potassium fluoride.

The chelating agent is nitrilotriacetic acid.

The penetrant is dodecyl betaine.

The preparation method of the organic acid cleaning agent comprises the following steps:

(A) weighing the citric acid, the glycolic acid, the formic acid, the corrosion inhibitor, the sodium fluoride, the potassium fluoride, the nitrilotriacetic acid and the dodecyl betaine according to the parts by weight for later use;

(B) mixing the citric acid, the glycolic acid and the formic acid according to the proportion, and then adding the mixture into a variable speed stirrer to be uniformly stirred to obtain a first mixture;

(C) adding the water in the proportion into a cleaning agent preparation container, adding the prepared first mixture and the nitrilotriacetic acid in the proportion, and stirring for 2 hours to fully dissolve the mixture to obtain a second mixture;

(D) adding the corrosion inhibitor, the sodium fluoride, the potassium fluoride and the dodecyl betaine into the prepared second mixture according to the proportion, and fully and uniformly stirring to obtain the organic acid cleaning agent.

Example 7

The embodiment provides an organic acid cleaning agent, which comprises the following raw materials in parts by weight: 23 parts of citric acid, 5 parts of glycolic acid, 2.5 parts of formic acid, 1.5 parts of corrosion inhibitor, 1 part of cleaning accelerator, 0.5 part of chelating agent, 0.4 part of penetrating agent and a proper amount of deionized water.

The initiator in the corrosion inhibitor is potassium persulfate, and the polyethylene polyamine is diethylenetriamine.

The cleaning accelerator is potassium fluoride.

The chelating agent is nitrilotriacetic acid.

The penetrant is dodecyl betaine.

The preparation method of the organic acid cleaning agent comprises the following steps:

(A) weighing the citric acid, the glycolic acid, the formic acid, the corrosion inhibitor, the sodium fluoride, the potassium fluoride, the nitrilotriacetic acid and the dodecyl betaine according to the parts by weight for later use;

(B) mixing the citric acid, the glycolic acid and the formic acid according to the proportion, and then adding the mixture into a variable speed stirrer to be uniformly stirred to obtain a first mixture;

(C) adding the water in the proportion into a cleaning agent preparation container, adding the prepared first mixture and the nitrilotriacetic acid in the proportion, and stirring for 2 hours to fully dissolve the mixture to obtain a second mixture;

(D) adding the corrosion inhibitor, the sodium fluoride, the potassium fluoride and the dodecyl betaine into the prepared second mixture according to the proportion, and fully and uniformly stirring to obtain the organic acid cleaning agent.

Example 8

This example differs from example 7 only in that the cleaning promoter is sodium fluoride.

Example 9

This example differs from example 7 only in that the chelating agent is ethylenediaminetetraacetic acid.

Comparative example 1

This example differs from example 7 only in that the amount of citric acid is 20 parts.

Comparative example 2

This example differs from example 7 only in that the amount of glycolic acid used is 3 parts.

Comparative example 3

This example differs from example 7 only in that the amount of formic acid is 1 part.

Comparative example 4

This example differs from example 7 only in that the amount of corrosion inhibitor is 5 parts.

Comparative example 5

The other steps of this comparative example were identical to those of example 7, except that formic acid and glycolic acid were not added, and only citric acid was used.

Comparative example 6

The other steps of this comparative example were identical to those of example 7, except that formic acid was replaced by acetic acid and the parts were unchanged.

Comparative example 7

The other steps of this comparative example were identical to those of example 7, except that no formic acid was added.

Comparative example 8

The other steps of this comparative example were identical to those of example 7, except that no glycolic acid was added.

Comparative example 9

The other steps of this comparative example were identical to those of example 7 except that no chelating agent was added.

Comparative example 10

The other steps of this comparative example were identical to those of example 7, except that the corrosion inhibitor was selected from commercially available products: TH-619B type corrosion and scale inhibitor.

Comparative example 11

In order to prove that the organic acid cleaning agent of the present invention is superior to the conventional cleaning agent, the conventional inorganic acid cleaning agent (hydrochloric acid content 10%) was added as a comparative example.

Comparative example 12

To demonstrate that the organic acid cleaner of the present invention is superior to the conventional cleaner, a conventional organic acid cleaner (sulfamic acid content 90%) was added as a comparative example.

Test results

The raw materials of the components of the above examples are all commercial industrial products.

The conventional inorganic acid cleaning agent of the above examples 1-9, the conventional inorganic acid cleaning agent of the comparative examples 1-10 and the conventional organic acid cleaning agent of the comparative example 11 and the conventional organic acid cleaning agent of the comparative example 12 are compared, and the evaluation standard refers to the chemical cleaning quality standard of HG-T2387-2007 industrial equipment, and the comparison result is as follows:

it is clear from the above experimental data that the performance of the organic acid cleaning agent of the present invention is superior to that of the inorganic acid cleaning agent and the organic acid cleaning agent of comparative examples 11 to 12, and the improvement is very significant, and the effect produced by the formulation used in example 7 of the present invention is most excellent.

As can be seen from the experimental data, the cleaning time of the embodiment provided by the invention is 2h, and compared with the comparative examples 11-12, the cleaning efficiency is improved, and meanwhile, the corrosion to the system is reduced; the test results of the descaling rate and the corrosion rate prove the excellent performance of the organic acid cleaning agent.

By comparing the above table with comparative example 5 and example 7, the addition of only citric acid, not formic acid and glycolic acid, reduces the descaling rate of the present invention under the same amount of other components, and thus it can be seen that the optimum descaling effect can be achieved only when the three weak acids are compounded.

By comparing the above comparative example 6 with the example 7, the scale removal rate of the invention is reduced when the amount of the other components is the same as that of the formic acid, and when the amount of the acetic acid is the same as that of the formic acid, the three weak acids of the formic acid, the citric acid and the glycolic acid are compounded to achieve the optimal scale removal effect, and the scale removal effect of the invention is influenced when one of the three weak acids is replaced.

By comparing the above comparative example 1 and example 7, the addition amount of citric acid affects the scale removal rate of the present invention under the same amount of other components, so it can be seen that the citric acid should be controlled within a reasonable range to ensure the good scale removal rate of the present invention. By comparing the above comparative example 2, comparative example 8 and example 7, the addition amount of glycolic acid affects the scale removal rate of the present invention under the condition that the other components are used in the same amount, especially, the scale removal rate of the present invention is obviously reduced because glycolic acid is not added in the comparative example 8, so that it can be seen that glycolic acid should be controlled within a reasonable range to ensure that the present invention has good scale removal rate. By comparing the above comparative example 3, comparative example 7 and example 7, the addition amount of formic acid affects the scale removal rate of the present invention under the condition that the other components are used in the same amount, and particularly, the scale removal rate of the present invention is obviously reduced because no formic acid is added in the comparative example 7, so that it can be seen that the formic acid should be controlled within a reasonable range to ensure that the good scale removal rate of the present invention is achieved.

By comparing example 10, example 11, comparative example 9 and example 7 above, the corrosion rates of the present invention are affected by the different selection or amounts of the cleaning promoter and the chelating agent, given the same amounts of the other components, and it can be seen that the proper selection or amounts of the cleaning promoter and the chelating agent provide the good corrosion rates of the present invention.

By comparing comparative example 10 and example 7 above, comparative example 10 selects the commercial corrosion inhibitor TH-619B type with the same amount of other components, and the cleaning time and the corrosion rate are inferior to those of example 7, so it can be seen that the corrosion inhibitor of the present invention can be used to have a good corrosion rate and cleaning time.

In a word, the organic acid cleaning agent is a weak acid cleaning agent, has small corrosivity on chemical equipment and pipelines, can effectively remove corrosion products, is safe and environment-friendly, ensures the heat transfer effect of the equipment, prolongs the service life of the equipment, and can ensure long-time operation of the equipment after cleaning.

While particular embodiments of the present invention have been illustrated and described, it would be obvious that various other changes and modifications can be made without departing from the spirit and scope of the invention. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this invention.