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Brown-coal green extractive solvent

A technology for extracting solvents and montan wax, which is applied in the field of montan wax extraction solvents, can solve the problems of operators' physical and surrounding environment hazards, unsatisfactory selectivity of benzene to wax, and limited use fields, etc., so as to benefit the operating environment and the surrounding environment , high wax extraction rate, low toxicity effect

Inactive Publication Date: 2010-05-19
CHINA UNIV OF MINING & TECH
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  • Abstract
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Problems solved by technology

[0003] (1) Benzene is a flammable, explosive, poisonous and harmful substance, and the extraction process is operated at a relatively high temperature close to its boiling point, with a large amount of volatilization, which is very harmful to the body of the operator and the surrounding environment;
[0004] (2) The selectivity of benzene to wax is not ideal, the content of resin and asphalt in the extracted montan wax is higher, and the crude wax quality of extraction is lower;
[0005] (3) The benzene solvent remaining in the montan wax limits the field of use of the product

Method used

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Examples

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Embodiment 2

[0023] Example 2: Mixed solvent formula: the mass percentage of cyclohexane and tert-butanol (methanol or ethanol) is 80%:20%. The production process is basically the same as that of the first embodiment, but the difference is that: a group of three tanks are used for extraction, and the solvent is operated countercurrently. The specific process is: sending the fresh mixed solvent of cyclohexane and tert-butanol (methanol or ethanol) into the extraction tank where the lignite has been extracted twice, and under the same conditions as in Example 1, after 1 hour of extraction Then the lignite is sent to the extraction tank where the lignite has been extracted once, and then the unextracted lignite is extracted. After the lignite is extracted three times, it is discharged and replaced with new coal, which is carried out in sequence.

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Abstract

A lignite wax green extractive solvent and its production are disclosed. The process is carried out by taking mixed solvent of cyclohexane and alcohol, crushing for lignite, screening, putting lignitecoal grain into extractor, mixing with solvent in proportion of 1:1-1:4 while extracting, flash evaporating, recovering solvent, evaporating for residual mixed solvent by stewing system to obtain crude lignite wax, condensing for mixed solvent steam by heat exchanger, oil-water separating, delivering cyclohexane to solvent trough, separating tert-butyl from water while rectifying, inducing tert-butyl into solvent trough, inspecting cyclohexane or tert-butyl content, supplement cyclohexane and alcohol, mixing proportionally and using. It's cheap, simple reliable, and economical, it has more wax yield and no environmental pollution.

Description

Technical field [0001] The invention relates to a montan wax extraction solvent. Background technique [0002] Lignite wax generally refers to a mixture of complex compounds obtained by organic solvent extraction of lignite. Montan wax and its processed products can not be replaced by any natural wax or synthetic wax, and it is an indispensable and important chemical product in the current national economy. As for the solvent used for the extraction of montan wax, toluene was used internationally in the 1980s. It is not known which solvent is currently used due to technical confidentiality. Domestic montan wax companies (mainly Inner Mongolia Wudan Wax Factory and Yunnan Xundian Wax Factory) have always used traditional organic solvent benzene, which has the following problems: [0003] (1) Benzene is a flammable, explosive, toxic and hazardous substance, and the extraction process is operated at a higher temperature close to its boiling point, with a large amount of volatilizati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G73/12
Inventor 胡光洲张双全
Owner CHINA UNIV OF MINING & TECH
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