阅读说明：本技术 一种加氢装置水溶性缓蚀剂及其制备方法和用途 (Water-soluble corrosion inhibitor for hydrogenation device and preparation method and application thereof ) 是由 付海明 叶显孟 傅小川 李兆军 于 2020-07-21 设计创作，主要内容包括：本发明涉及加氢装置防腐蚀技术领域,具体是一种加氢装置水溶性缓蚀剂及其制备方法和用途,包括以下步骤：以体积份数计；S1.备料：取棕榈酸10～20份、聚乙二醇类化合物10～40份、10～50份氰酸酯类化合物、乙二胺10～20份溶于有机溶剂中,并加入和1～5份催化剂,制得混合原料；S2.搅拌：将S1中的混合原料使用搅拌罐持续搅拌3～6小时,制成初步混合料；S3.投料。本发明的水溶性缓蚀剂属于成膜缓蚀剂,特别适用于催化、加氢和蒸馏装置的低温塔顶系统。缓蚀剂从分馏塔顶挥发线注入,随着管线介质物流在途经的管线和设备上形成致密的保护膜,隔离腐蚀介质对设备和管线的腐蚀,降低腐蚀速率,延长运行周期。(The invention relates to the technical field of corrosion prevention of hydrogenation devices, in particular to a water-soluble corrosion inhibitor of a hydrogenation device, a preparation method and application thereof, and the method comprises the following steps: in parts by volume; s1, material preparation: dissolving 10-20 parts of palmitic acid, 10-40 parts of polyethylene glycol compounds, 10-50 parts of cyanate compounds and 10-20 parts of ethylenediamine in an organic solvent, and adding 1-5 parts of a catalyst to prepare a mixed raw material; s2, stirring: continuously stirring the mixed raw materials in the S1 for 3-6 hours by using a stirring tank to prepare a primary mixture; and S3, feeding. The water-soluble corrosion inhibitor of the invention belongs to a film-forming corrosion inhibitor, and is particularly suitable for a low-temperature tower top system of a catalyzing, hydrogenation and distillation device. The corrosion inhibitor is injected from a volatile line at the top of the fractionating tower, and a compact protective film is formed on a passing pipeline and equipment along with the medium material flow of the pipeline, so that the corrosion of a corrosion medium to the equipment and the pipeline is isolated, the corrosion rate is reduced, and the operation period is prolonged.)

1. A preparation method of a water-soluble corrosion inhibitor of a hydrogenation device is characterized by comprising the following steps: the method comprises the following steps: in parts by volume;

s1, material preparation: dissolving 10-20 parts of palmitic acid, 10-40 parts of polyethylene glycol compounds, 10-50 parts of cyanate compounds and 10-20 parts of ethylenediamine in an organic solvent, and adding 1-5 parts of a catalyst to prepare a mixed raw material;

s2, stirring: continuously stirring the mixed raw materials in the S1 for 3-6 hours by using a stirring tank to prepare a primary mixture;

s3, feeding: adding 10-30 parts of water-soluble imidazoline into the preliminary mixture in the S2, and continuously stirring for 0.5-2 hours by using a stirring tank to obtain a semi-finished product mixture;

s4, oscillating: performing high-frequency oscillation on the semi-finished product mixture in the step S3 for 1-2 hours by using a vibrating rod, and discharging bubbles in the mixed solution;

s5, secondary feeding: adding 20-40 parts of petroleum ether into the vibrated semi-finished product mixture obtained in the step S4, and continuously stirring for 0.5-2 hours by using a stirring tank to obtain a water-soluble corrosion inhibitor mixed solution;

s6, standing: standing the mixed solution in the S5 for 0.5-1 hour, and removing precipitates to obtain a water-soluble corrosion inhibitor;

s7, packaging: the water-soluble corrosion inhibitor in S6 was packaged using a plastic bucket.

2. The method for preparing the water-soluble corrosion inhibitor for the hydrogenation unit according to claim 1, wherein the method comprises the following steps: in S1, the catalyst includes any one or a combination of two or more of triethylenediamine, stannous octoate, dibutyltin dilaurate and sulfonic acid.

3. The method for preparing the water-soluble corrosion inhibitor for the hydrogenation unit according to claim 1, wherein the method comprises the following steps: in S2, the stirring speed is 200-300 revolutions per minute, and the temperature is 10-80 ℃.

4. The method for preparing the water-soluble corrosion inhibitor for the hydrogenation unit according to claim 1, wherein the method comprises the following steps: in S3, the stirring speed is 200-300 revolutions per minute, and the temperature is 10-80 ℃.

5. The method for preparing the water-soluble corrosion inhibitor for the hydrogenation unit according to claim 1, wherein the method comprises the following steps: in S4, the frequency of the vibrating rod is 100-200 HZ, and the temperature is 30-100 ℃.

6. The method for preparing the water-soluble corrosion inhibitor for the hydrogenation unit according to claim 1, wherein the method comprises the following steps: in S5, the stirring speed is 200-300 revolutions per minute, and the temperature is 10-80 ℃.

7. The method for preparing the water-soluble corrosion inhibitor for the hydrogenation unit according to claim 1, wherein the method comprises the following steps: and in S6, standing at the temperature of 20-50 ℃.

8. The method for preparing the water-soluble corrosion inhibitor for the hydrogenation unit according to claim 1, wherein the method comprises the following steps: in S6, the water-soluble corrosion inhibitor mixed solution is stood, then pure water-soluble corrosion inhibitor is poured out, and the remaining precipitate is filtered by a plate and frame filter press.

9. The method for preparing the water-soluble corrosion inhibitor for the hydrogenation unit according to claim 1, wherein the method comprises the following steps: in S7, the plastic barrel is made of polyethylene.

10. The application of the water-soluble corrosion inhibitor of the hydrogenation unit is characterized in that: the water-soluble corrosion inhibitor is diluted by 50-100 times with water for use.

Technical Field

The invention relates to the technical field of corrosion prevention of hydrogenation devices, in particular to a water-soluble corrosion inhibitor for a hydrogenation device and a preparation method and application thereof.

Background

In the oil gas exploitation process, impurity elements such as N, S, Cl in the feed of a hydrogenation device for oil gas exploitation react under the action of hydrogenation to form corrosive media such as H2S, NH3 and HCl, part of the corrosive media are carried to the top of a fractionating tower along with oil gas, and when the amount of condensed water in an initial condensation zone is small and the acid concentration is high, the equipment is seriously corroded, and in addition, the generated ammonia salt blocks the pipeline of the equipment and forms corrosion under scale.

Chinese patent No. CN201110336680.0 discloses a water-soluble corrosion inhibitor, which consists of benzotriazole and sodium silicate. The invention also discloses a method for preparing zinc powder slurry by applying the corrosion inhibitor, which comprises the steps of firstly weighing electrolytic zinc powder which is sieved by a 200-mesh sieve according to the requirement, then taking benzotriazole, putting the benzotriazole into distilled water for mixing, then adding sodium silicate, mixing and dissolving to obtain the corrosion inhibitor; adding the weighed zinc powder into a corrosion inhibitor, stirring and mixing to form zinc powder slurry; adding the steel ball and the zinc powder slurry into a cleaned ball mill cavity, starting the ball mill to grind for 1-2 hours, and stopping the ball mill to obtain the zinc powder slurry. The preparation process method of the flaky zinc powder by the water mill adopts distilled water as a grinding medium, solves the problems of low ball milling efficiency and potential dust safety hazard in a dry milling method, and solves the problem that zinc powder and a wet milling solvent are not easy to separate in an organic solvent wet milling method.

In the above CN201110336680.0 patent, although a certain corrosion-retarding effect can be achieved, the corrosion-retarding effect is poor, and the application range of temperature and ph is narrow, which leads to severe corrosion of oil and gas exploitation equipment, and contains metal, which causes pollution of downstream water quality, and is not suitable for wide popularization and application.

Disclosure of Invention

The invention aims to provide a water-soluble corrosion inhibitor for a hydrogenation device, a preparation method and application thereof, and aims to solve the problems of poor corrosion resistance effect, metal content, and narrow application range of temperature and pH value in the background technology.

The technical scheme of the invention is as follows: a preparation method of a water-soluble corrosion inhibitor of a hydrogenation device comprises the following steps: in parts by volume;

s1, material preparation: dissolving 10-20 parts of palmitic acid, 10-40 parts of polyethylene glycol compounds, 10-50 parts of cyanate compounds and 10-20 parts of ethylenediamine in an organic solvent, and adding 1-5 parts of a catalyst to prepare a mixed raw material;

s2, stirring: continuously stirring the mixed raw materials in the S1 for 3-6 hours by using a stirring tank to prepare a primary mixture;

s3, feeding: adding 10-30 parts of water-soluble imidazoline into the preliminary mixture in the S2, and continuously stirring for 0.5-2 hours by using a stirring tank to obtain a semi-finished product mixture;

s4, oscillating: performing high-frequency oscillation on the semi-finished product mixture in the step S3 for 1-2 hours by using a vibrating rod, and discharging bubbles in the mixed solution;

s5, secondary feeding: adding 20-40 parts of petroleum ether into the vibrated semi-finished product mixture obtained in the step S4, and continuously stirring for 0.5-2 hours by using a stirring tank to obtain a water-soluble corrosion inhibitor mixed solution;

s6, standing: standing the mixed solution in the S5 for 0.5-1 hour, and removing precipitates to obtain a water-soluble corrosion inhibitor;

s7, packaging: the water-soluble corrosion inhibitor in S6 was packaged using a plastic bucket.

Further, in S1, the catalyst includes any one or a combination of two or more of triethylenediamine, stannous octoate, dibutyltin dilaurate and sulfonic acid.

Further, in S2, the stirring speed is 200-300 revolutions per minute, and the temperature is 10-80 ℃.

Further, in S3, the stirring speed is 200-300 revolutions per minute, and the temperature is 10-80 ℃.

Further, in S4, the frequency of the vibrating bar is 100-200 HZ, and the temperature is 30-100 ℃.

Further, in S5, the stirring speed is 200-300 revolutions per minute, and the temperature is 10-80 ℃.

Further, in S6, the standing temperature is 20-50 ℃.

Further, in S6, the water-soluble corrosion inhibitor mixture is stood still, and then pure water-soluble corrosion inhibitor is poured out, and the remaining precipitate is filtered by a filter press.

Further, in S7, the plastic barrel is made of polyethylene.

The application of the water-soluble corrosion inhibitor of the hydrogenation device is to dilute the water-soluble corrosion inhibitor by 50-100 times by adding water.

The invention provides a hydrogenation device water-soluble corrosion inhibitor and a preparation method and application thereof through improvement, and compared with the prior art, the hydrogenation device water-soluble corrosion inhibitor has the following improvement and advantages:

(1) the water soluble corrosion inhibitor of the present invention belongs to a film forming corrosion inhibitor, which is used for the corrosion prevention of low temperature equipment and pipelines at the top of an oil refinery tower, and is particularly suitable for a low temperature tower top system of a catalyzing, hydrogenation and distillation device. The corrosion inhibitor is injected from a volatile line at the top of the fractionating tower, and a compact protective film is formed on a passing pipeline and equipment along with the medium material flow of the pipeline, so that the corrosion of a corrosion medium to the equipment and the pipeline is isolated, the corrosion rate is reduced, and the operation period is prolonged.

(2) According to the invention, through the arrangement of the palmitic acid and the petroleum ether, the application range of the pH value of the palmitic acid water-soluble corrosion inhibitor is wide, the palmitic acid water-soluble corrosion inhibitor is still suitable for the environment with the pH value lower than 3, and the petroleum ether is used for enabling the water-soluble corrosion inhibitor to still play a role at a high temperature of 80-100 ℃.

(3) The water-soluble corrosion inhibitor does not contain any metal and halogen, does not cause negative influence on downstream production, has good dispersion effect, does not cause product deposition and accumulation, has good water solubility, and is convenient to dissolve and use.

Drawings

The invention is further explained below with reference to the figures and examples:

FIG. 1 is an overall flow diagram of the present invention;

FIG. 2 is a resting flow diagram of the present invention;

FIG. 3 is a table of case corrosion data analysis of the present invention.

Detailed Description

The present invention will be described in detail with reference to fig. 1 to 3, and the technical solutions in the embodiments of the present invention will be clearly and completely described, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The invention provides a hydrogenation device water-soluble corrosion inhibitor and a preparation method and application thereof through improvement.