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
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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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