A kind of auxiliary agent for processing coal tar and preparation method thereof

Abstract

The invention relates to a pretreatment auxiliary for coal tar and a preparation method of the pretreatment auxiliary. The pretreatment auxiliary is prepared through steps as follows: polyethylene polyamine is taken as an initiator and initiates copolymerization of ethylene oxide, propylene epoxide, 4-(2,3-epoxypropaneoxy)-carbazole in the presence of a basic catalyst, and polyether intermediates are obtained; then the pretreatment auxiliary is prepared from the polyether intermediates and fatty acid ester through a reaction in the presence of a transesterification catalyst. The product can realize good assistant viscosity reducing and emulsion breaking effects after added to coal tar raw materials and is helpful in improvement of efficiency of desalting and dewatering processes, thereby being a novel and efficient multifunctional composite auxiliary for purification pretreatment process of the coal tar.

Description

technical field

[0001] The invention belongs to the field of preparation and application of coal tar pretreatment additives, and in particular relates to a composite additive with multiple functions of demulsification, viscosity reduction and corrosion inhibition and a preparation method thereof. Background technique

[0002] Desalination and dehydration of coal tar is one of the key technologies in the new process of low-temperature pyrolysis coal tar processing, which has a great impact on its high-quality utilization. Low-temperature coal tar is a primary pyrolysis product. It has a large specificity and is close to water, high viscosity, and strong emulsification. Its own characteristics also make it more difficult to break the emulsion during the desalination and dehydration process than ordinary crude oil. The electrochemical desalination and dehydration method using a demulsifier has the advantages of milder temperature and pressure requirements, simple operation, and...

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