Method for efficiently extracting fossilized plant wax from brown coal and device thereof

Abstract

The invention discloses a method for efficiently extracting fossilized plant wax from brown coal and a device thereof. The method comprises the steps of pretreating the brown coal, conducting gradient leaching, recovering the solvent to precipitate the wax, desolventing residual coal, and molding and packaging. The device comprises a feeding unit, a leaching unit, an evapo-separated unit, a disolventing unit, and a condensation system. According to the invention, by using a mixed solvent comprising toluene and ethanol or tert-butyl alcohol as the extraction solvent, the toxicity is lower than that of toluene, the latent heat of vaporization is lower than that of toluene, thus the energy consumption of mass transfer process is reduced; by adopting a large liquid-solid ratio cycle work mode to carry out gradient continuous cycle leaching on the brown coal particles, the leaching rate can reach more than 85%, and wax content in the coal dry basis after leaching is less than 0.8%; the technology leaching temperature is lower than the solvent boiling point, thus isopropanol and other insoluble substances in the lignite wax are greatly reduced; the negative desolventing process can effectively prevent wax pyrolysis, raise the acid value and saponification value of the was, so as to raise the quality of the obtained wax; the brown coal throughput per unit reaches 60T / h, and the automation and large scale production can be realized.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, and specifically relates to a method and a device for efficiently extracting fossilized vegetable wax from lignite with simple process and high wax extraction rate. Background technique [0002] The chemical composition and properties of the waxes in organic rocks are very similar to natural animal and plant waxes. It is mainly wax esters (high-carbon fatty esters) composed of waxy acids (high-carbon fatty acids) and wax alcohols (high-carbon fatty alcohols), and some of them are free. Wax acid, and a small amount of wax alcohol, wax ketone, aliphatic hydrocarbons and other components. Therefore, this kind of fossilized vegetable wax is a natural animal and plant wax substitute or supplement that is scarce in resources and expensive. Since it has no carcinogens, it can be applied to all wax-using departments and is an important chemical product indispensable to the national economy...

AI Technical Summary

Problems solved by technology

Although the leaching rate of batch extraction method is relatively high, it has relatively high requirements on extraction temperature and pressure conditions, the quality of montan wax is not as good as that of continuous extraction method, and the degree of automation is low, the labor intensity of workers is high, and the working environment is poor.

Images