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Method for preparing modified lignin in ionic liquid solvent system

An ionic liquid solvent, ionic liquid technology, applied in the production of bulk chemicals, etc., can solve the problems of increased investment, pollution, corrosion of equipment, etc., to achieve the effect of low operating costs, beneficial to the health of operators, and beneficial to environmental protection

Inactive Publication Date: 2013-07-10
DALIAN TIANBAO CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the lignin produced by the organic solvent method can only be dissolved in alkaline solution, which not only increases the investment, but also corrodes the equipment and causes new pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1, will contain 20g [C 4 A 50ml three-necked bottle of MIM]Cl ionic liquid was placed in an 80°C oil bath, and after the temperature stabilized, 2g of lignin was added thereto. The dissolving time of lignin in the ionic liquid is 30 min. After cooling down to 60° C., 0.18 g of formaldehyde was added, and the reaction was terminated after stirring for 0.5 h. After cooling, it is washed with water and dried to obtain the hydroxymethyl derivative material of lignin.

Embodiment 2

[0013] Embodiment 2, will contain 20g [C 2 A 50ml three-necked bottle of MIM]Cl ionic liquid was placed in an 80°C oil bath, and after the temperature stabilized, 2g of lignin was added thereto. The dissolving time of lignin in the ionic liquid is 30 min. After cooling down to 60° C., 0.18 g of formaldehyde was added, and the reaction was terminated after stirring for 0.5 h. After cooling, it is washed with water and dried to obtain the hydroxymethyl derivative material of lignin.

Embodiment 3

[0014] Embodiment 3, will contain 20g [C 1 A 50ml three-necked bottle of MIM]Cl ionic liquid was placed in an 80°C oil bath, and after the temperature stabilized, 2g of lignin was added thereto. The dissolving time of lignin in the ionic liquid is 30 min. After cooling down to 60° C., 0.18 g of formaldehyde was added, and the reaction was terminated after stirring for 0.5 h. After cooling, it is washed with water and dried to obtain the hydroxymethyl derivative material of lignin.

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PUM

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Abstract

The invention discloses a method for preparing modified lignin in an ionic liquid solvent system, which comprises the following steps: (1) adding ethanol lignin into ionic liquid (till the mass content of the lignin in the ionic liquid is 10 to 40 percent), heating in an oil bath at 80 DEG C, mechanically stirring for 30 minutes to dissolve the lignin, and forming ionic liquid solution of the lignin; (2) cooling to 60 DEG C, adding formaldehyde in an amount which is 1 to 1.5 times the mass of the lignin into the ionic liquid solution of the lignin, continuing to stir for 0.5 hour and ending the reaction; and (3) cooling, washing with water, drying and obtaining a hydroxymethyl derivative material of the lignin. In the invention, because the modified lignin is prepared by using the ionic liquid, the operation cost is low, the environment and health of operators are protected, and the requirement of green production is met.

Description

technical field [0001] The invention relates to the preparation and application of lignin derivative materials, which belongs to the field of natural polymer chemistry and also belongs to the field of material science. In particular, it relates to the preparation and application of a lignin derivative material in an ionic liquid solvent system. Background technique [0002] Lignin, a biopolymer, is second only to cellulose in natural reserves, and is regenerated at a rate of 50 billion tons every year. The pulp and paper industry separates about 140 million tons of cellulose from plants every year, and at the same time obtains about 50 million tons of lignin by-products, which are the main components of wood processing waste. More than 95% of lignin is still directly discharged into rivers or After being concentrated, it is burnt as fuel, and seldom used effectively, becoming a major source of pollution. Recently, in order to recycle lignin, it has been modified and used t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08H7/00
CPCY02P20/54
Inventor 宋云保马英冲付泉于长顺王少君
Owner DALIAN TIANBAO CHEM IND