Solvent and method for removing resin from lignite wax by virtue of crystallization process

Abstract

The invention discloses a solvent and method for removing resin from lignite wax by virtue of a crystallization process, belonging to methods for removing resin from lignite wax. The method comprises the following steps: (1) heating and dissolving, namely putting lignite wax particles into a crystallization kettle, injecting a cyclohexane solvent or an acetic ester solvent according to a material-liquid mass ratio of 1:(5-50), stirring, heating the crystallization kettle by using steam, and controlling the pressure of the container to be 1.0-5.0 MPa until the lignite wax particles are dissolved; (2) cooling and crystallizing, namely after the lignite wax particles are dissolved, stopping heating, performing water cooling on the crystallization kettle until the temperature is between -10 and 20 DEG C, and keeping the low temperature for crystallization for 10-50 minutes; (3) filtering and drying, namely after crystallization, filtering to separate filter residues and filtrate, performing reduced pressure drying on the filter residues at 40 DEG C in a vacuum drying machine, and then performing press forming; and (4) recovering the filtrate, namely recovering by virtue of rectification, and separating the solvent and resin for recycling. The solvent adopted in the method disclosed by the invention is cyclohexane or acetic ester, and the two solvents are nontoxic, cause small harm to human bodies, are not corrosive, can be recycled, are harmless to the ecological environment and are environment-friendly.

Description

technical field [0001] The invention relates to a method for removing resin from montan wax, in particular to a solvent and method for removing resin in montan wax by crystallization. Background technique [0002] The main components of montan wax include pure wax, pitch and resin. The composition of montan wax extracted from coal in different coal-forming environments is different. Generally, pure wax components account for 60-70%, resin components account for 20-30%, and asphalt components Accounted for 5 to 20%. At present, the montan wax extraction technology in Germany is relatively mature, and the resin content of the montan wax produced by it is relatively low, generally about 15%, while the resin content in the montan wax produced in my country is as high as 25-30%, far below the industrial requirements. Too high resin content will make montan wax sticky, affect the co-solubility of montan wax and paraffin wax, reduce the physical and mechanical properties of montan...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a solvent and method for removing resin in montan wax by crystallization, so as to solve the problem that the existing montan wax deresin adopts solid-liquid extraction method, and the solvent cannot completely enter the inside of the particles, and only the montan wax particles can be treated. The resin on the surface is extracted and removed, and the resin in the deep layer of the particles is difficult to remove due to being wrapped

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