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Method for separating and extracting straw lignin by using eutectic ionic liquid

A technology of straw lignin and ionic liquid, which is applied in the application field of the chemical industry, can solve the problems of no application, etc., and achieve the effects of reducing energy consumption, simple extraction process, and simple preparation process

Active Publication Date: 2016-07-13
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with traditional ionic liquids, the preparation process is simple, the raw materials are easy to obtain, the price is low, and there is no environmental side effect, but it has no application in the extraction of lignin from biomass

Method used

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  • Method for separating and extracting straw lignin by using eutectic ionic liquid
  • Method for separating and extracting straw lignin by using eutectic ionic liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0016] Weighed 35 g of choline chloride and 30 g of urea, respectively added to a sealed reaction vessel, stirred at 80° C. for 40 min, the reaction liquid was transparent, and Ch-U deep eutectic ionic liquid was obtained. Slowly add 3.25 g of rice straw powder, and when the temperature is raised to about 150° C., the mixture of modified lignin and DES is obtained after heat preservation reaction for 5 hours. Adjust the pH value of the mixture to about 11 with a sodium hydroxide solution with a concentration of about 10%, centrifuge at a high speed, and keep the upper layer solution. Use sulfuric acid with a concentration of about 10% to adjust the pH value of the solution to below 3, and after centrifuging again, wash the precipitate with distilled water several times, centrifuge until the supernatant is neutral, and freeze-dry the final precipitate to obtain lignin 0.195 g.

Embodiment 2

[0018] Weighed 35 g of choline chloride and 46 g of glycerol, respectively added to a sealed reaction vessel, stirred at 80° C. for 40 min, the reaction liquid was transparent, and Ch-G deep eutectic ionic liquid was obtained. Slowly add 4.05 g of rice straw powder, and when the temperature is raised to about 150° C., a mixture of modified lignin and DES is obtained after a heat preservation reaction for 5 hours. Adjust the pH value of the mixture to about 11 with a sodium hydroxide solution with a concentration of about 10%, centrifuge at a high speed, and keep the upper layer solution. Use sulfuric acid with a concentration of about 10% to adjust the pH value of the solution to below 3, and after centrifuging again, wash the precipitate with distilled water several times, centrifuge until the supernatant is neutral, and freeze-dry the final precipitate to obtain lignin 0.505 g.

Embodiment 3

[0020] Weighed 35 g of choline chloride and 48 g of citric acid, respectively added to a sealed reaction vessel, stirred at 80° C. for 80 min, the reaction liquid was transparent, and Ch-C eutectic ionic liquid was obtained. Slowly add 4.15 g of rice straw powder, and when the temperature is raised to about 150° C., a mixture of modified lignin and DES is obtained after a heat preservation reaction for 5 hours. Adjust the pH value of the mixture to about 11 with a sodium hydroxide solution with a concentration of about 10%, centrifuge at a high speed, and retain the upper layer solution. Use sulfuric acid with a concentration of about 10% to adjust the pH value of the solution to below 3, and after centrifuging again, wash the precipitate with distilled water several times, centrifuge until the supernatant is neutral, and freeze-dry the final precipitate to obtain lignin 0.65 g.

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Abstract

The invention relates to a process method for separating and extracting straw lignin by using eutectic ionic liquid. The method comprises the following steps of: adding a straw powder raw material and eutectic ionic liquid into a normal pressure reactor according to a certain mass ratio, performing mixing and stirring for reaction at 110-160 DEG C for a certain period of time, then regulating the pH value of the mixture to about 11 by using an alkali, performing high-speed centrifugation, and keeping an upper layer solution; and then regulating the pH value of the solution to be less than 3 by using an acid, performing centrifugation again, then washing and centrifuging a deposit by using distilled water until the supernatant is neutral, and performing freeze drying on the final deposit to obtain lignin. The method has the characteristics that the eutectic ionic liquid is prepared under a very mild condition by using low-price and nontoxic choline chloride and an H-bond donor as raw materials, and is used for separating and extracting lignin from rice straws, the raw materials are easy to obtain, the price is low, the process is simple, the condition is mild, the reaction is easy to control, and the energy consumption can be effectively reduced.

Description

technical field [0001] The invention belongs to the application field of chemical industry, and in particular relates to a process for separating and extracting straw lignin with eutectic ionic liquid. Background technique [0002] In my country, the annual output of rice straw is as high as 230 million tons, which is a huge amount of renewable biomass resources, and the effective use of natural renewable resources has become one of the keys to the sustainable development of human beings today. Lignin is one of the most important components in rice straw, and its content is second only to cellulose. With the increasing shortage of petroleum resources, lignin, as the only source of aromatic rings in renewable resources, needs more exploration , more chemicals and daily necessities can be synthesized by replacing petroleum with lignin. However, due to various types, complex chemical structures, and lack of pure model substances, the extraction, separation, and application of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H7/00
CPCC08H6/00
Inventor 连海兰孙香陈玲潘明珠杨蕊冒海燕黄润洲梁星宇梅长彤周晓燕
Owner NANJING FORESTRY UNIV
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