A method of acid ionic liquid pretreatment to improve yield and quality of lignin pyrolysis tar

A technology of acidic ionic liquid and tar yield, which is applied in coking ovens, petroleum industry, special forms of dry distillation, etc. It can solve the problems of waste of resources, environmental pollution, destruction, etc., and achieve the goal of increasing yield, stabilizing the process and improving economy Effect

Active Publication Date: 2017-09-15
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Judging from the current situation, such a huge and valuable biomass resource has not been effectively utilized, and about 95% of the lignin has been directly discharged into the river outside in the form of "black liquor" or concentrated and burned. , while wasting resources, it also causes further pollution and damage to the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh 3g of 1-butyl-3-methylimidazolium dihydrogen phosphate and 3g of lignin and mix well, pretreat at 200°C for 30min, and wash with water to remove 1-butyl-3-methylimidazole Dihydrogen phosphate, the mixture of water and 1-butyl-3-methylimidazolium dihydrogen phosphate can be recovered by evaporation and recycled. After multiple washings, the pretreated lignin is dried for further use. Weigh 3 g of pretreated lignin and place it in a fixed-bed reactor. The pyrolysis conditions are nitrogen atmosphere, the flow rate is 100ml / min, heating from room temperature to 800°C, the heating rate is 10°C / min, and the liquid product is collected with a cold trap. The collected tar was separated by column chromatography to obtain aliphatic hydrocarbons, aromatic hydrocarbons and phenolic components respectively. It is found that the yield of liquid products is increased by 75% compared with that of the original lignin, and the yield of phenolic compounds is increased by 8 times ...

Embodiment 2

[0020] Weigh 3g of 1-butyl-3-methylimidazolium dihydrogen phosphate and 3g of lignin and mix well, pretreat at 50°C for 3 hours, and wash with ethanol to remove 1-butyl-3-methyl The mixture of imidazole dihydrogen phosphate, ethanol and 1-butyl-3-methylimidazolium dihydrogen phosphate can be recycled through evaporation recovery. After multiple washings, the pretreated lignin is dried for further use. Weigh 3 g of pretreated lignin and place it in a fixed-bed reactor. The pyrolysis conditions are nitrogen atmosphere, the flow rate is 100ml / min, heating from room temperature to 800°C, the heating rate is 10°C / min, and the liquid product is collected with a cold trap. The collected tar was separated by column chromatography to obtain aliphatic hydrocarbons, aromatic hydrocarbons and phenolic components respectively. It was found that the yield of liquid products was doubled compared with that of the original lignin, and the yield of phenolic compounds was increased by 11 times...

Embodiment 3

[0022] Weigh 0.03g of 1-butyl-3-methylimidazolium dihydrogen phosphate and 3g of lignin, mix well, pretreat at 250°C for 2 hours, and wash with acetone to remove 1-butyl-3-formazol The mixture of imidazolium dihydrogen phosphate, acetone and 1-butyl-3-methylimidazolium dihydrogen phosphate can be recycled by evaporation. After multiple washings, the pretreated lignin is dried for further use. Weigh 3 g of pretreated lignin and place it in a fixed-bed reactor. The pyrolysis conditions are nitrogen atmosphere, the flow rate is 100ml / min, heating from room temperature to 800°C, the heating rate is 10°C / min, and the liquid product is collected with a cold trap. The collected tar was separated by column chromatography to obtain aliphatic hydrocarbons, aromatic hydrocarbons and phenolic components respectively. It is found that the liquid product yield is increased by 45% compared with the original lignin, and the yield of the phenolic compound is increased by 2 times compared wit...

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PUM

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Abstract

The invention discloses a method for raising yield and quality of lignin pyrolysis tar by acidic ionic liquid pretreatment and belongs to the technical field of comprehensive utilization of biomass. By selecting an acidic ionic liquid capable of efficiently damaging weak bonding structures such as hydrogen bond, ether bond, carbon-carbon bond and the like in lignin, lignin and the acidic ionic liquid are added into a reaction kettle to carry out pretreatment under mild conditions; the acidic ionic liquid is washed with a solvent and lignin is dried; and after recovered, the solvent and the acidic ionic liquid are reused. In comparison with lignin pyrolysis without acidic ionic liquid pretreatment, the lignin pyrolysis after pretreatment has advantages as follows: yield of tar is high and contents of phenolic compound in tar are remarkably raised. The method of the invention has the following beneficial effects: the technology is simple; the process is clean; yield of tar is high, and tar is rich in phenolic compounds; and dosage of the acidic ionic liquid is low and the acidic ionic liquid is easy to recycle.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of biomass, and in particular relates to a method for pretreating lignin with an acidic ionic liquid to increase the yield of tar obtained by its pyrolysis and significantly increase the content of phenolic compounds. Background technique [0002] Every year, approximately 50 billion tons of lignin are produced on Earth through photosynthesis. At the same time, lignin is also produced in large quantities as a by-product all over the world. For example, the national pulp and paper industry needs to separate a large amount of cellulose from biomass every year, which is as much as 140 million tons, thereby obtaining a large amount of lignin by-products, which is 50 million tons. tons or so. Judging from the current situation, such a huge and valuable biomass resource has not been effectively utilized, and about 95% of the lignin has been directly discharged into the river outside i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10B53/00C10B57/08
CPCC10B53/00C10B57/08
Inventor 雷智平张凯水恒福任世彪王知彩
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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