Preparation process of demulsifier for sulfur-containing coking wastewater

Abstract

The invention discloses a preparation process of a demulsifier for sulfur-containing coking wastewater. The preparation process comprises steps as follows: Step one, long carbon chain organic acid and polyethylene polyamine are subjected to a condensation polymerization reaction in the presence of an aromatic hydrocarbon solvent, reflux is kept, and a polyester initiator is prepared; Step two, propylene epoxide and ethylene oxide are added to the polyester initiator sequentially, and an ethylene oxide-epoxypropane segmented copolymer is prepared; Step three, lauryl ammonium chloride and an alkaline-earth metal catalyst are added to the ethylene oxide-epoxypropane segmented copolymer, and a polymer containing cation function groups is prepared; Step four, a nonionic surfactant, deionized water or alcohol is added to the polymer which contains the cation function groups and is prepared in the Step three, and a finished product of the demulsifier for the sulfur-containing coking wastewater is prepared; an oil-in-water type emulsified liquid in the wastewater not only has a good demulsification function, but also has certain extraction capability, the oil-water separation capability can be remarkably improved, the wastewater purification effect is realized, and the oil content of sewage discharge is reduced.

Description

technical field [0001] The invention relates to a preparation technology of a sulfur-containing sewage demulsifier added in a coking device of an oil refinery, in particular to a preparation process of a coking sulfur-containing sewage demulsifier. Background technique [0002] Coking sulfur-containing sewage has problems such as sewage emulsification, large fluctuations in sewage, high oil content in sewage, and poor contact with the oil-gas separation tank on the top of the cooling tower. As a result, the oil content of domestic coking sulfur-containing sewage is above 1000mg / L, sometimes reaching About 10000mg / L. [0003] The sulfur-containing sewage of the delayed coking unit mainly includes: the top sewage of the coking fractionation tower, the sewage at the top of the contact cooling tower, and the sewage of the absorbed stable part; especially the sulfur-containing sewage discharged from the top of the contact cooling tower is severely emulsified and cannot meet the d...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art, to provide a preparation process of coking sulfur-containing sewage demulsifier, effectively solve the problem of oily sulfur-containing sewage in domestic delayed coking units, and carry out the structure of the demulsifier In order to adjust and introduce cationic functional groups, it not only has a strong demulsification effect on the oil-in-water emulsion in wastewater, but also has a certain extraction ability, which can significantly improve the ability of oil-water separation, achieve the effect of purifying sewage, and reduce Oil content of sewage discharge