阅读说明：本技术 一种金属表面处理含油废水用破乳絮凝剂的制备方法 (Preparation method of demulsifying flocculant for treating oily wastewater on metal surface ) 是由 李鸿昊 李建强 于 2021-08-23 设计创作，主要内容包括：一种金属表面处理含油废水用破乳絮凝剂的制备方法,涉及污水处理技术领域,该破乳絮凝剂包括以下组分及含量：聚合氯化铁：15-20％；乙二酸15-20％；硬脂酸酰胺丙基二甲基烷基季铵盐10-15％；乙二醇4-6％；水45-56％；包括以下步骤：1)将乙二醇和水充分混合；2)加入乙二酸搅拌均匀；3)接着加入硬脂酸酰胺丙基二甲基烷基季铵盐搅拌均匀；4)最后加入聚合氯化铁搅拌均匀；5)静置至少24小时得到破乳絮凝剂产品。所得复合破乳絮凝剂制备方法简单,制备原料易得,所用聚合氯化铁具有良好的絮凝效果,和硬脂酸酰胺丙基二甲基烷基季铵盐配合得到了理想的破乳絮凝效果。(A preparation method of a demulsifying flocculant for treating oily wastewater on a metal surface relates to the technical field of sewage treatment, and the demulsifying flocculant comprises the following components in percentage by weight: poly ferric chloride: 15 to 20 percent; 15-20% of oxalic acid; 10-15% of stearic acid amide propyl dimethyl alkyl quaternary ammonium salt; 4-6% of ethylene glycol; 45-56% of water; the method comprises the following steps: 1) fully mixing ethylene glycol and water; 2) adding oxalic acid and stirring uniformly; 3) then adding stearic acid amide propyl dimethyl alkyl quaternary ammonium salt and stirring uniformly; 4) finally adding the polyferric chloride and stirring uniformly; 5) standing for at least 24 hours to obtain the demulsifying flocculant product. The preparation method of the composite demulsifying flocculant is simple, the preparation raw materials are easy to obtain, the used polyferric chloride has a good flocculating effect, and the ideal demulsifying and flocculating effect is obtained by matching the polyferric chloride with the stearic acid amide propyl dimethyl alkyl quaternary ammonium salt.)

1. A preparation method of a demulsifying flocculant for treating oily wastewater on a metal surface is characterized by comprising the following steps: the demulsifying flocculant comprises the following components in percentage by total weight, wherein the total weight is 100 percent:

poly ferric chloride: 15 to 20 percent;

15-20% of oxalic acid;

10-15% of stearic acid amide propyl dimethyl alkyl quaternary ammonium salt;

4-6% of ethylene glycol;

the balance of water;

the method comprises the following steps:

1) fully mixing ethylene glycol and water;

2) adding oxalic acid and stirring uniformly;

3) then adding stearic acid amide propyl dimethyl alkyl quaternary ammonium salt and stirring uniformly;

4) finally adding the polyferric chloride and stirring uniformly;

5) standing for at least 24 hours to obtain the demulsifying flocculant product.

2. The method for preparing the demulsifying flocculant for treating the oily wastewater by the metal surface as claimed in claim 1, which is characterized by comprising the following steps: in the step 1), the ethylene glycol is mixed with water after the temperature of the ethylene glycol is kept between 30 and 40 ℃.

3. The method for preparing the demulsifying flocculant for treating the oily wastewater by the metal surface as claimed in claim 1, which is characterized by comprising the following steps: keeping the temperature in the step 2) at 30-40 ℃, and adding oxalic acid.

4. The method for preparing the demulsifying flocculant for treating the oily wastewater by the metal surface as claimed in claim 1, which is characterized by comprising the following steps: and 3) heating to 45-55 ℃, and adding stearic acid amide propyl dimethyl alkyl quaternary ammonium salt.

5. The method for preparing the demulsifying flocculant for treating the oily wastewater by the metal surface as claimed in claim 1, which is characterized by comprising the following steps: and 4) keeping the temperature of 45-55 ℃, adding the polyferric chloride, grinding, stirring and naturally cooling.

6. The method for preparing the demulsifying flocculant for treating the oily wastewater by the metal surface as claimed in claim 1, which is characterized by comprising the following steps: the demulsifying flocculant comprises the following components in percentage by total weight, wherein the total weight is 100 percent:

poly ferric chloride: 18 percent;

18% of oxalic acid;

13% of stearic acid amide propyl dimethyl alkyl quaternary ammonium salt;

4% of ethylene glycol;

the balance being water.

7. The method for preparing the demulsifying flocculant for treating the oily wastewater by the metal surface as claimed in claim 1, which is characterized by comprising the following steps: the demulsifying flocculant comprises the following components in percentage by total weight, wherein the total weight is 100 percent:

poly ferric chloride: 20 percent;

oxalic acid 20%;

15% of stearic acid amide propyl dimethyl alkyl quaternary ammonium salt;

4% of ethylene glycol;

the balance being water.

8. The method for preparing the demulsifying flocculant for treating the oily wastewater by the metal surface as claimed in claim 1, which is characterized by comprising the following steps: in step 1), the ethylene glycol is mixed with water after the temperature is kept at 40 ℃.

Keeping the temperature in the step 2) at 40 ℃, and adding oxalic acid.

And 3) heating to 45 ℃, and adding stearic acid amide propyl dimethyl alkyl quaternary ammonium salt.

In step 4), polymeric ferric chloride is added while maintaining the temperature at 45 ℃.

9. The method for preparing the demulsifying flocculant for treating the oily wastewater by the metal surface as claimed in claim 1, which is characterized by comprising the following steps: in step 1), the ethylene glycol is mixed with water after the temperature is kept at 40 ℃.

Keeping the temperature in the step 2) at 40 ℃, and adding oxalic acid.

And 3) heating to 50 ℃, and adding stearic acid amide propyl dimethyl alkyl quaternary ammonium salt.

In step 4), poly ferric chloride is added while maintaining 50 ℃.

Technical Field

The invention relates to the technical field of sewage treatment, in particular to a preparation method of a high-efficiency demulsifying flocculant for treating oily wastewater on a metal surface.

Background

With the development of the metal surface treatment industry, the addition amount of the oil for the metal surface treatment industry is larger and larger. But due to the technical limitation, lagging and management, a large amount of oil products enter water to form pollution. The economic and simple water treatment technology is selected to treat the oily wastewater after the metal surface treatment so as to reach the discharge standard, and people pay more and more attention to the technology. The invention relates to a composite high-efficiency demulsifier for oily wastewater, which has the advantages of simplicity, easy implementation, small dosage, good economic benefit and the like for the oily wastewater generated by the heat treatment of metal surfaces, can greatly reduce the operation cost and has the advantage of good treatment effect.

Disclosure of Invention

The invention provides a preparation method of a high-efficiency demulsifying flocculant for treating oily wastewater on a metal surface, and the obtained flocculant is used for treating the oily wastewater on the metal surface, can realize flocculation of grease in the wastewater and primary treatment of the oily wastewater, and lays a foundation for subsequent purification of the wastewater.

In order to achieve the purpose, the invention adopts the technical scheme that:

a preparation method of a demulsifying flocculant for treating oily wastewater on a metal surface comprises the following components in percentage by weight, wherein the total amount is 100%:

the balance of water;

1) fully mixing ethylene glycol and water;

2) adding oxalic acid and stirring uniformly;

3) then adding stearic acid amide propyl dimethyl alkyl quaternary ammonium salt and stirring uniformly;

4) finally adding the polyferric chloride and stirring uniformly;

5) standing for at least 24 hours to obtain the demulsifying flocculant product.

Further, in the step 1), the ethylene glycol is mixed with water after the temperature is kept at 30-40 ℃.

Further, the temperature is kept at 30-40 ℃ in the step 2), and oxalic acid is added.

Further, the temperature is raised to 45-55 ℃ in the step 3), and stearic acid amide propyl dimethyl alkyl quaternary ammonium salt is added.

Further, adding the polyferric chloride at the temperature of 45-55 ℃ in the step 4), grinding, stirring and naturally cooling.

Further, the demulsifying flocculant comprises the following components in percentage by total weight, wherein the total weight is 100 percent:

the balance being water.

Further, in step 1), the ethylene glycol is mixed with water after keeping the temperature at 40 ℃.

Keeping the temperature in the step 2) at 40 ℃, and adding oxalic acid.

And 3) heating to 45-50 ℃, and adding stearic acid amide propyl dimethyl alkyl quaternary ammonium salt.

And 4) keeping the temperature of 45-50 ℃ in the step 4), and adding the polyferric chloride.

The invention has the following effects:

the composite demulsifying flocculant prepared by the method is simple in preparation method, the raw materials are easy to obtain, the used polyferric chloride has a good flocculating effect, the polyferric chloride is matched with the stearic acid amide propyl dimethyl alkyl quaternary ammonium salt to obtain an ideal demulsifying and flocculating effect, the dehydration rate can reach 96.1%, and the COD removal rate can reach 83.1%.

The specific implementation mode is as follows:

the following describes embodiments of the present invention by way of examples.

Example 1: adding 4g of ethylene glycol into a beaker, keeping the temperature at 30 ℃, then adding 56g of water, uniformly mixing, then adding 15g of oxalic acid, uniformly stirring, heating to 45 ℃, then adding 10g of stearic acid amide propyl dimethyl alkyl quaternary ammonium salt, uniformly stirring for 3 hours, uniformly mixing, keeping the temperature at 45 ℃, adding 15g of polyferric chloride, grinding and stirring by a grinder for 1 hour, uniformly mixing, naturally cooling, and standing for 24 hours.

Example 2: adding 4g of ethylene glycol into a beaker, keeping the temperature at 35 ℃, then adding 53g of water, uniformly mixing, then adding 16g of oxalic acid, uniformly stirring, heating to 45 ℃, then adding 11g of stearic acid amide propyl dimethyl alkyl quaternary ammonium salt, uniformly stirring for 3 hours, keeping the temperature at 45 ℃, adding 16g of polyferric chloride, grinding and stirring by a grinder for 1 hour, uniformly mixing, naturally cooling, and standing for 24 hours.

Example 3: adding 4g of ethylene glycol into a beaker, keeping the temperature at 40 ℃, then adding 50g of water, uniformly mixing, then adding 17g of oxalic acid, uniformly stirring, heating to 55 ℃, then adding 12g of stearic acid amide propyl dimethyl alkyl quaternary ammonium salt, uniformly stirring for 3 hours, keeping the temperature at 55 ℃, adding 17g of polyferric chloride, grinding and stirring by a grinder for 1 hour, uniformly mixing, naturally cooling, and standing for 24 hours.

Example 4: adding 4g of ethylene glycol into a beaker, keeping the temperature at 40 ℃, then adding 47g of water, uniformly mixing, then adding 18g of oxalic acid, uniformly stirring, heating to 45 ℃, then adding 13g of stearic acid amide propyl dimethyl alkyl quaternary ammonium salt, uniformly stirring for 3 hours, keeping the temperature at 45 ℃, adding 18g of polyferric chloride, grinding and stirring by a grinder for 1 hour, uniformly mixing, naturally cooling, and standing for 24 hours.

Example 5: adding 4g of ethylene glycol into a beaker, keeping the temperature at 30 ℃, then adding 44g of water, uniformly mixing, then adding 19g of oxalic acid, uniformly stirring, heating to 50 ℃, then adding 14g of stearic acid amide propyl dimethyl alkyl quaternary ammonium salt, uniformly stirring for 3 hours, uniformly mixing, keeping the temperature at 50 ℃, adding 19g of polyferric chloride, grinding and stirring by a grinder for 1 hour, uniformly mixing, naturally cooling, and standing for 24 hours.

Example 6: adding 4g of ethylene glycol into a beaker, keeping the temperature at 40 ℃, then adding 41g of water, uniformly mixing, then adding 20g of oxalic acid, uniformly stirring, heating to 50 ℃, then adding 15g of stearic acid amide propyl dimethyl alkyl quaternary ammonium salt, uniformly stirring for 3 hours, uniformly mixing, keeping the temperature at 50 ℃, adding 20g of polyferric chloride, grinding and stirring by a grinder for 1 hour, uniformly mixing, naturally cooling, and standing for 24 hours.

And (3) testing the performance of the composite demulsifying flocculant: the performance evaluation of the demulsifying flocculant is carried out by referring to a related experimental method in the general technical conditions of crude oil demulsifiers (SY/T5280-2018) of the oil and gas industry standard, and the dehydration rate is used as an evaluation index.

The dosage of each example is 100mg/L, and the results are as follows:

serial number	Dehydration Rate (%)	COD removal Rate (%)
			Example 1	94.6	81.2
Example 2	93.8	80.1
			Example 3	93.8	83.1
Example 4	96.1	82.7
			Example 5	93.4	82.5
Example 6	95.3	82.8

The preparation method is simple, the preparation raw materials are easy to obtain, the used polyferric chloride has a good flocculation effect, and an ideal demulsification and flocculation effect is obtained by matching with the stearic acid amide propyl dimethyl alkyl quaternary ammonium salt.