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Method for separating xylogen from agricultural waste by using compound ion liquid

A technology of agricultural waste and composite ions, applied in the field of environmental protection, can solve the problems of complicated operation, many intermediate steps, large amount of consumption, etc., and achieve the effects of simple conversion process, reduced dosage, and reduced dosage

Inactive Publication Date: 2012-01-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Method for separating xylogen from agricultural waste by using compound ion liquid
  • Method for separating xylogen from agricultural waste by using compound ion liquid
  • Method for separating xylogen from agricultural waste by using compound ion liquid

Examples

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Embodiment 1

[0035] A method for efficiently separating lignin from agricultural waste using a composite ionic liquid system, the operation steps are as follows:

[0036] (1) Preparation of composite ionic liquid: mix 5g of ionic liquid solvent 1-butyl-3-methylimidazole chloride salt (bmimCl) and 0.1mol of acidic ionic liquid catalyst 1-butanesulfonate-3-methylimidazole hydrogen sulfate Salt (C 4 H 8 SO 3 HmimHSO 4 ) In N 2 Mix thoroughly in an ice water bath under protection to obtain a composite ionic liquid;

[0037] (2) Pretreatment of agricultural waste: After the bagasse is fully dried, it is crushed to 20-60 mesh by mechanical crushing method. Wash the components soluble in organic matter and water with acetone and deionized water in sequence, and then fully dry for later use;

[0038] (3) Delignification of agricultural waste: 20g of composite ionic liquid obtained in step (1) and 1.5g bagasse are thoroughly mixed, and the reaction system is subjected to N 2 After three replacements, hea...

Embodiment 2

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

[0041] (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 ) In N 2 Mix thoroughly in an ice water bath under protection to obtain a composite ionic liquid;

[0042] (3) Delignification of agricultural waste: 100g of the above composite ionic liquid and 20g of rice husk are thoroughly mixed, and the reaction system is subjected to N 2 After replacement for 3 times, 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 kettle, and fully dilute with 400 mL of water, filter, and test the solid The test after drying shows that the content of lignin in the solid is as high as 61.4%. The conversion rate of cellulose and hemicellulose was 94.2%.

Embodiment 3

[0044] The difference between this embodiment and Embodiment 1 is:

[0045] (1) Preparation of composite ionic liquid: 200g of the ionic liquid solvent 1-ethyl-3-methylimidazole methyl sulfate (emimMeSO 4 ) And 5mol acidic ionic liquid catalyst 1-butanesulfonic acid pyridine bisulfate (C 4 H 8 SO 3 HPyHSO 4 ) In N 2 Mix thoroughly in an ice water bath under protection to obtain a composite ionic liquid;

[0046] (3) Delignification of agricultural waste: 500g of the above-mentioned composite ionic liquid and 60g of wheat straw are thoroughly mixed, and the reaction system is subjected to N 2 After three replacements, heat to 240°C and react for 5 min under stirring conditions (speed 1000r / min). After the reaction, cool the reactor to room temperature, pour out the contents of the kettle, and fully dilute with 500 mL of water, filter, and test the solid The content of lignin is as high as 65.2%; cellulose and hemicellulose are almost 100% converted into small molecular biochemicals s...

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Abstract

The invention discloses a method for efficiently separating xylogen from agricultural waste by using a compound ion liquid system. The method comprises the following steps of: (1) preparing a compound ion liquid: preparing a compound ion liquid with a synergistic effect through mechanical mixing or a dianion initiator ion exchange method; (2) pretreating agricultural waste: fully drying the agricultural waste, smashing to 20-60 meshes by adopting a mechanical smashing method, washing soluble components with acetone and deionized water in sequence, and fully drying for later use; and (3) removing xylogen from the agricultural waste: fully mixing 5-500 grams of compound ion liquid with 1.5-60 grams of agricultural waste in an inertia atmosphere, and reacting at the temperature of 120-260 DEG C under the stirring condition to obtain high-purity xylogen and biological micro-molecular substances. The method has the advantages of high xylogen content, small using amount of ion liquid, circular use and no need of adding deionized water.

Description

Technical field [0001] The invention belongs to the fields of environmental protection technology, agricultural waste comprehensive utilization technology and new energy technology development and utilization, and particularly relates to a method for efficiently separating lignin from agricultural wastes such as bagasse and the like 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 very important applications 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 potential, cheap, and renewable low-carbon alternative energy source, which is helpful to alleviate the current increasingly severe energy crisis and The environmental pollution caused by the burning of a large amount of disposable fossil energy is of great significance. However, the c...

Claims

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Application Information

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IPC IPC(8): C08H7/00B01J31/02B01J31/04
Inventor 李雪辉龙金星郭斌王芙蓉于英豪王乐夫
Owner SOUTH CHINA UNIV OF TECH