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Method for depolymerizing lignite by using ionic liquid

A technology of ionic liquid and lignite, which is applied in the separation of depolymerization products and ionic liquids. The depolymerization of lignite in ionic liquids under mild conditions can solve the problem of unresolved product separation and achieve high product yield and high reaction temperature. Low, process stable effect

Inactive Publication Date: 2011-07-27
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the extraction yield of lignite in the studied ionic liquid is basically about 14%-22.5%, and the extraction rate in the ionic liquid and organic solvent is basically about 23.4%-46.3%, and the problem of separating the product from the ionic liquid has not been solved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: 10 g of 1-butyl-3-methylimidazolium chloride and 1 g of Yunnan Xianfeng lignite were weighed and placed in a microwave extraction instrument at a temperature of 200° C. for 30 minutes, and cooled to room temperature after the reaction. Dilute the mixture in the microwave reactor with N-methylpyrrolidone and move it to a suction filtration device for filtration, collect the resulting liquid, clean the residual coal with N-methylpyrrolidone ultrasound for 15 minutes and centrifuge three times, and clean the residual coal with distilled water. Vacuum dry at 80°C for 12-24h. The collected filtered liquid is filtered with a 0.45 μm filter membrane, the residue is included in the residual coal to calculate the extraction rate, and the filtrate is rotary evaporated to recover N-methylpyrrolidone. Add distilled water to the depolymerization product and ionic liquid obtained by rotary evaporation, let it stand for 48 hours, wash the depolymerization product of the pre...

Embodiment 2

[0020] Example 2: 20 g of 1-butyl-3-methylimidazolium chloride and 1 g of Yunnan Xianfeng lignite were weighed and placed in a microwave extraction instrument at a temperature of 250° C. for 60 minutes, and cooled to room temperature after the reaction. Use ionic liquid to wash out the mixture in the microwave reactor and move it to a centrifuge tube, centrifuge at a speed of 16000rpm / min, and collect the upper layer liquid, clean the residual coal with ionic liquid for 15 minutes and centrifuge three times, and clean the residual coal with distilled water. The filtrate was collected and vacuum-dried at 80° C. for 12-24 hours. The conversion rate of Yunnan Xianfeng lignite was 73% based on the residue. Add distilled water to the upper liquid collected by centrifugation, let it stand for 48 hours, wash the precipitate with distilled water, and dry the precipitate in vacuum at 80° C. for 12-24 hours. Sequentially elute the reaction product with water, acetone, toluene, tetrahydr...

Embodiment 3

[0021] Example 3: 5g of 1-butyl-3-methylimidazolium bromide and 1g of Yunnan Xianfeng lignite were weighed and placed in a microwave extraction instrument at a temperature of 150°C for 30 minutes, and cooled to room temperature after the reaction. Dilute the mixture in the microwave reactor with ethanol and move it to a suction filtration device to filter, and collect the resulting liquid, clean the residual coal with ethanol for 15 minutes and centrifuge three times, clean the residual coal with distilled water, and dry it in vacuum at 80°C for 12-24 hours . The collected filtered liquid is filtered with a 0.45 μm filter membrane, the residue is included in the residual coal to calculate the extraction rate, and the filtrate is rotary evaporated to recover ethanol. Add distilled water to the depolymerization product and ionic liquid obtained by rotary evaporation, let it stand for 48 hours, wash the depolymerization product of the precipitate with distilled water, and dry the...

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Abstract

The invention provides a method for depolymerizing lignite by using an ionic liquid, belonging to the technical field of comprehensive utilization of lignite. The method comprises the following steps: selecting an ionic liquid which is beneficial to efficiently depolymerizing lignite, adding lignite powder and the ionic liquid into a reaction kettle, heating under the assisting action of microwaves to 50-350 DEG C, and reacting for 2 minutes to 5 hours to obtain a reaction product; after the reaction finishes, separating the reaction product from residues by a high-speed centrifugal separation method or an organic solvent washing and filter membrane filtration method; and washing the supernatant or filtrate with water, evaporating to obtain the organic solvent, reaction product and ionic liquid, wherein the organic solvent and ionic liquid can be recycled, and the lignite reaction product can be separated by the organic solvent to obtain high-added-value organic chemicals of alkyl aromatics and multielement cyclic aromatics containing alkoxy groups and phenolic groups. The method has the advantages of simple technique, clean process, and high added value of the product, and needs no or little harmful or volatile organic solvents.

Description

Technical field: [0001] The invention belongs to the technical field of comprehensive utilization of lignite, and in particular relates to a method for depolymerizing lignite in an ionic liquid under mild conditions and separating a depolymerization product from the ionic liquid. Background technique: [0002] my country is rich in medium and low-rank coal resources, especially the proven reserve of lignite reaches 130.3 billion tons. Due to the presence of high ash (about 30%), high moisture (20-50%) and low calorific value (about 14MJ.kg) of most lignite -1 ), low ash melting point, poor thermal stability, and easy weathering and spontaneous combustion are considered inferior fuels. However, lignite is a coal with a low degree of metamorphism, and it retains the macromolecular structure of coal-forming plants to a greater extent. By choosing an appropriate method to depolymerize lignite, ultra-clean coal and many high value-added oxygen-containing organic chemicals can b...

Claims

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Application Information

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IPC IPC(8): C10G1/04
Inventor 雷智平伍练水恒福王知彩任世彪康世刚
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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