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Method for separating lignin from agricultural waste by using composite ionic liquid

A technology of agricultural waste and compound ions, which is applied in the field of environmental protection, can solve the problems of cumbersome operation, many intermediate steps, and large dosage, and achieve the effect of simple conversion process, reduced dosage, and reduced dosage

Inactive Publication Date: 2017-03-22
威海印九红果蔬种植专业合作社
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its limited solubility in ionic liquids, the amount of ionic liquid in the above system is relatively large, and it must first be dissolved in the ionic liquid to form a homogeneous solution, and then the homogeneous solution can be extracted and transformed, so the intermediate Many steps, cumbersome operation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A method for efficiently separating lignin from agricultural waste by using a composite ionic liquid system, the operation steps are as follows:

[0032] (1) Preparation of composite ionic liquid: 5g ionic liquid solvent 1-butyl-3-methylimidazolium chloride (bmimCl) and 0.1mol acidic ionic liquid catalyst 1-butanesulfonic acid group-3-methylimidazolium hydrogen sulfate Salt (C 4 h 8 SO 3 HmimHSO 4 ) at N 2 Fully mixed in an ice-water bath under protection to obtain a composite ionic liquid;

[0033] (2) Pretreatment of agricultural waste: After the bagasse is fully dried, it is crushed to 20-60 meshes by mechanical crushing. And wash its organic and water-soluble components with acetone and deionized water successively, and then fully dry it for later use;

[0034] (3) delignification of agricultural waste: 20g of the compound ionic liquid gained in step (1) is fully mixed with 1.5g bagasse, and the reaction system is subjected to N 2 After 3 replacements, heat t...

Embodiment 2

[0036] The difference between this embodiment and embodiment 1 is:

[0037] (1) Preparation of composite ionic liquid: 50g ionic liquid solvent 1-butyl-3-methylimidazole acetate (bmimAc) and 1mol acidic ionic liquid catalyst 1-butyl-3-methylimidazole hydrogen sulfate ( bmimHSO 4 ) at N 2 Fully mixed in an ice-water bath under protection to obtain a composite ionic liquid;

[0038] (3) Delignification of agricultural waste: 100g of the above-mentioned composite ionic liquid and 20g of rice husk were fully mixed, and the reaction system was subjected to N 2 After 3 replacements, heat to 200°C and react for 30 minutes under stirring conditions (speed 500r / min). After the reaction, cool the reactor to room temperature, pour out the contents of the reactor, fully dilute with 400mL of water, and filter. The solid obtained in the experiment After drying, the test showed that the lignin content in the solid matter was as high as 61.4%. The conversion rate of cellulose and hemicell...

Embodiment 3

[0040] The difference between this embodiment and embodiment 1 is:

[0041] (1) Preparation of composite ionic liquid: 200g of ionic liquid solvent 1-ethyl-3-methylimidazolium methyl sulfate (emimMeSO 4 ) and 5mol acidic ionic liquid catalyst 1-butanesulfonic acid pyridine bisulfate (C 4 h 8 SO 3 HSO 4 ) at N 2 Fully mixed in an ice-water bath under protection to obtain a composite ionic liquid;

[0042] (3) Delignification of agricultural waste: 500g of the above-mentioned composite ionic liquid and 60g of wheat straw were fully mixed, and the reaction system was subjected to N 2 After 3 replacements, heat to 240°C and react for 5 minutes under stirring conditions (speed 1000r / min). After the reaction, cool the reactor to room temperature, pour out the contents of the reactor, fully dilute with 500mL of water, and filter. The solid obtained in the experiment The content of lignin in the material is as high as 65.2%; almost 100% of cellulose and hemicellulose are convert...

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Abstract

The invention discloses a method for efficiently separating lignin from agricultural waste by using a composite ionic liquid system. The method comprises the following steps: (1) preparation of composite ionic liquid: subjecting composite ionic liquid with cooperative effect to mechanical mixing or double-anion ion exchange; (2) pretreatment of agricultural waste: fully drying the agricultural waste, then crushing the agricultural waste to a size of 20 to 60 meshes by using a mechanical crushing method, washing the soluble components of crushed agricultural waste with acetone and deionized water successively and thoroughly drying the agricultural waste for subsequent usage; and (3) and delignification of the agricultural waste: fully mixing 5 to 500 g of the composite ionic liquid with 1.5 to 60 g of the agricultural waste and carrying out a reaction in an inert atmosphere at a temperature of 120 to 260 DEG C under stirring so as to obtain high-purity lignin and biological micromolecular substances. According to the method, the content of the obtained lignin is high; the usage amount of the ionic liquid is low; and the composite ionic liquid is cyclically usable and does not need addition of deionized water.

Description

technical field [0001] The invention belongs to the fields of environmental protection technology, comprehensive utilization technology of agricultural waste and development and utilization of new energy technology, and particularly relates to a method for efficiently separating lignin from bagasse and other agricultural waste by using a composite ionic liquid system. Background technique [0002] Lignin is the second largest natural polymer after cellulose. It is an important component of biomass and has a very important application in the chemical industry. Biomass is directly derived from the photosynthesis of green plants, so it is widely distributed in nature and rich in content. It is a very potential, cheap, renewable and low-carbon alternative energy source, which will help alleviate the current increasingly severe energy crisis and Problems such as environmental pollution caused by burning a large amount of disposable fossil energy are of great significance. Howeve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H7/00C07G1/00
CPCC08H6/00C07G1/00
Inventor 迟桂丽
Owner 威海印九红果蔬种植专业合作社
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