Production method for extracting lignite wax from brown coal

A technology for montan wax and lignite, which is applied in the field of chemical material preparation, can solve the problems of residual benzene solvent, high energy consumption, low production cost, etc., and achieves the effects of high solvent purity, good product quality, and reduced solvent amount

Active Publication Date: 2013-07-24
安徽嘉旗粮油工程技术有限公司
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  • Summary
  • Abstract
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Problems solved by technology

[0003] At present, domestic montan wax manufacturers in Xundian, Eshan, Jilin, and Wudan, Inner Mongolia mostly use benzene and toluene as extraction solvents to extract montan wax from lignite, but benzene solvents pollute the environment and endanger human body Healthy, there are still benzene solvent residues in the extracted montan wax; Also, CN101906320A discloses a production method of high-purity montan wax, which includes solvent extraction, and is characterized in that during extraction, adding a solvent until the lignite is not crossed, so The solvent is composed of the following components in mass ratio: isopropanol 20-100%, alcohols or hydrocarbons or water 0-80%, and the alcohols are one or more of methanol, ethanol, tert-butanol Described hydrocarbon is one or more in sherwood oil, No. 6 solvent, normal hexane, hexanaphthene, but the deficiency that these several kinds of solvents extract montan wax is that energy consumption is big, production cost is high; CN101029255A discloses a A kind of montan wax green extraction solvent and production process, using a mixed solvent of cyclohexane and alcohols; crushing and screening the lignite, putting the lignite coal partic

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  • Production method for extracting lignite wax from brown coal

Examples

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Example Embodiment

[0037] Example 1

[0038] (a) Multi-stage countercurrent pulse extraction: The lignite particles are transported to the extractor by the material-sealing conveyor. At 50℃, they are first sprayed, soaked and extracted with an extraction solvent containing 4.0% lignite wax by mass concentration, and then drained. After the extraction solvents containing montan wax with mass concentrations of 3.5%, 2.5%, 1.5%, 0.5%, 0.2%, 0.1%, respectively, followed by seven-stage spray immersion extraction and draining, the extraction solvent contains methanol and industrial n-hexane (content 60 The mass ratio of %) is 0.5:1, and the mass ratio of extraction solvent to lignite is 1.5:1. The extraction is repeated for 180 minutes, and then sprayed with n-hexane solvent for soaking extraction, and finally with methanol solvent for spraying soaking extraction to achieve multi-stage extraction. Countercurrent pulse extraction;

[0039] (b) Negative pressure countercurrent film evaporation: the montan w...

Example Embodiment

[0049] Example 2

[0050] (a) Multi-stage countercurrent pulse extraction: The lignite particles are transported to the extractor by the material-sealing conveyor. At 55℃, they are first sprayed, soaked and extracted with an extraction solvent containing 3.8% lignite wax by mass concentration, and then drained. After the extraction solvents containing montan wax with mass concentrations of 3.0%, 2.0%, 1.0%, 0.8%, 0.4%, and 0.05%, successively seven-stage spray immersion extraction and draining, the mass ratio of methanol to n-hexane in the extraction solvent is 0.8:1, the mass ratio of extraction solvent to lignite is 1.8:1, and the extraction is repeated for 120 minutes, and then sprayed soaked with n-hexane solvent, and finally with methanol solvent sprayed soaked to achieve multi-stage countercurrent pulse extraction;

[0051] (b) Negative pressure countercurrent film evaporation: the montan wax-containing mixture obtained in step (a) is filtered through a 120-mesh coarse filter...

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Abstract

The invention relates to a production method for extracting lignite wax from brown coal. The production technology comprises the steps of (a) multi-stage countercurrent pulse extraction; (b) negative-pressure countercurrent film evaporation; and (c) negative-pressure distillation concentration, wherein an extraction solvent in the step (a) is mixed solution of methanol to industrial n-hexane, of which the solvent mass ratio is (0.5-0.8):1; and the mass ratio of the extraction solvent to the brown coal is (1.5-1.8):1. By adopting the production method, the yield of the lignite wax is greatly improved; large-scale and industrial production is achieved; the problems of large solvent input and low extraction yield in industrial production of the lignite wax are solved; and the production method is free of environmental pollution, and low in production cost, is an innovative technology of extracting the lignite wax from the brown coal, and has great economic benefit and social benefit.

Description

technical field [0001] The invention relates to a preparation method of chemical materials, in particular to a production method of extracting montan wax from lignite. Background technique [0002] Lignite, also known as firewood coal, is the mineral coal with the lowest degree of coalification, a brown-black, dull low-rank coal between peat and bituminous coal. Montan wax is a rare mineral. Germany first began to extract wax from lignite in 1897, so it is also called Montan Wax abroad. It is a mineral wax containing waxes, resins and bitumen. A mixture containing waxes, resins and bitumen extracted from waxy coals such as lignite or certain peats by solvents such as benzene and gasoline. The properties of montan wax mainly depend on the raw material, the solvent used and the extraction conditions. With the increase of bitumen content, its color changes from brown to black. [0003] At present, domestic montan wax manufacturers in Xundian, Eshan, Jilin, and Wudan, Inner ...

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Application Information

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IPC IPC(8): C10G73/00
Inventor 王晓平
Owner 安徽嘉旗粮油工程技术有限公司
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