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

A high-efficiency, vegetable wax technology, applied in the field of coal chemical industry, can solve the problems of high extraction temperature and pressure conditions, high labor intensity of workers, and poor quality of montan wax, etc., to achieve high equipment utilization efficiency, equipment volume reduction, automation high degree of effect

Active Publication Date: 2013-01-02
QUJING ZHONGYI FINE CHEMICAL INDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 mo

Method used

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

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Experimental program
Comparison scheme
Effect test

Embodiment approach

[0031] The organic solvent is a mixed solvent of toluene and ethanol or tert-butanol, the volume ratio of toluene in the mixed solvent is 80-95%, and the volume ratio of ethanol or tert-butanol is 5-20%.

[0032] The qualified particle size coal is sent to the heat exchanger 3 through the feeding scraper machine 1, and after being preheated to 85-95°C, it is sent to the ring-belt-frame leaching machine 7 by the distribution scraper machine 5 for leaching. You can also choose the star feeder to be used in conjunction with or replace the scraper conveying device.

[0033] The waxy organic solvent is preheated to 85~95°C by the heat exchanger 15, and then sprayed onto the coal particles in the belt-frame leaching machine 7; the primary waxy organic solvent of the waxy organic solvent is The concentration is 1.5-2.5%, and then the waxy concentration is gradually decreased with a gradient of 0.15-0.25%, until the residual coal after leaching is washed with pure organic solvent.

...

Embodiment 1

[0042] Raw coal is crushed and screened to obtain coal with a particle size of 0.2-5.0mm, and the base moisture of the coal is controlled to be 16-20% after drying. After preheating to 85°C, the coal with qualified particle size is sent to the belt-frame leaching machine 7, and it is contacted and mass-transferred with the waxy organic solvent preheated to 85°C. The organic solvent includes volume ratio A mixed solvent of 80% toluene and 20% ethanol; the wax concentration in the initial waxy organic solvent is 1.5%, and then the wax concentration gradually decreases with a gradient of 0.15% until the residual coal after leaching is washed with pure organic solvent ; After the pure organic solvent is preheated to 85°C, spray and wash the residual coal after leaching according to the weight ratio of coal and organic solvent 1:1.5, and remove the residual wax in the coal to a dry wax content of E B，d <0.8%, then the residual coal enters the 1.5m-long draining section to drain the...

Embodiment 2

[0044] Raw coal is crushed and screened to obtain coal with a particle size of 0.2-5.0mm, and the base moisture of the coal is controlled to be 16-20% after drying. Preheat coal with qualified particle size to 95°C and send it into the belt-frame leaching machine 7, and contact with the wax-containing organic solvent preheated to 95°C for countercurrent mass transfer, and the organic solvent includes volume ratio A mixed solvent of 95% toluene and 5% ethanol; the wax concentration in the primary waxy organic solvent is 2.5%, and the wax concentration gradually decreases with a gradient of 0.25% until the residual coal after leaching is washed with pure organic solvent; After the pure organic solvent is preheated to 95°C, the residual coal after leaching is sprayed and washed according to the weight ratio of coal and organic solvent 1:2.5, and the residual wax in the coal is removed to a dry wax content of E B，d <0.8%, then the residual coal enters the 2.5m-long draining sectio...

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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...

Claims

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Application Information

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IPC IPC(8): C10G73/00
Inventor 刘长胜罗国林
Owner QUJING ZHONGYI FINE CHEMICAL INDUSTRY CO LTD
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