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...

AI Technical Summary

Problems solved by technology

The electrochemical desalination and dehydration method using a demulsifier has the advantages of milder temperature and pressure requirements, simple operation, and easy continuous operation compared with methods such as heating and standing and tube furnace evaporation. However, the electrochemical demulsification method is currently used for coal tar desalination There are few manufacturers of dehydration. One important reason is that the application of demulsifiers needs to be formulated according to the properties of raw oil, and coal tar has special properties different from crude oil, such as high viscosity, colloidal asphaltenes, etc., which have high content of surface active components and high content of impurities. Inferior characteristics such as complexity and complexity, and relatively unstable quality factors such as the composition and properties of tar raw materials make it difficult for manufacturers to select suitable demulsifiers and use processes

On the other hand, the processing and utilization of coal tar also requires tar raw materials to have good fluidity. Although raising the temperature is beneficial to the transportation and processing of high-viscosity raw materials, at the same time, long-term high-temperature environments will also lead to polycondensation reactions of some unstable components. be promoted, reduce the quality of coal tar, and lead to an increase in indicators such as toluene insolubles, residual carbon, and ash

In addition, the salty and acidic sewage used in the process of purifying coal tar raw materials is itself highly corrosive, which can damage the metal parts of the purification equipment for a long time, shorten the stable operation period of the equipment, and easily lead to security incident

[0003] The above-mentioned series of problems caused by the need for purification and pretreatment of coal tar raw materials can be solved by adding different functional chemicals (demulsifiers, viscosity reducers, corrosion and scale inhibitors, etc.) at different stages and parts. However, the operation is relatively complicated, the amount of additives used is large, and the unit consumption is high. At the same time, after different types of additives are added to the system, some unintended side reactions may occur, resulting in weakened functions. Or even lost, the combination of these problems will increase the operating cost of the device, and also reduce the economy and safety, which is not conducive to production and processing

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