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Preparation of Lignin Carboxylates
Time:2018-09-10 09:43 Views:
Lignin as the second natural rich natural polymer, is a renewable natural biomass resources. In China, industrial lignin mainly from the alkaline pulp and paper pulp waste, with rich sources, low prices and poor water solubility and so on.

Lignin as the second natural rich natural polymer, is a renewable natural biomass resources. In China, industrial lignin mainly from the alkaline pulp and paper pulp waste, with rich sources, low prices and poor water solubility and so on. With industrial lignin as raw material, through the chemical modification of the production of "environmentally friendly" green fine chemical products and the development of green chemical technology, not only can reduce the pollution caused by paper waste, but also can improve the economic value of industrial lignin, The use of lignin such important biomass resources, with environmental and resource dual significance.
In the solvent preparation process, the optimal synthesis process was obtained under the reaction conditions of water and ethanol volume ratio of 20:80, the reaction temperature was 70 ℃ and the secondary alkali addition method. The synthesized lignin carboxylic acid The sodium carboxymethylation yield and carboxyl content of sodium were 94.8% and 2.76mmol / g, respectively. In the water medium preparation process, the mass concentration of sodium hydroxide was 20.0%, the concentration of monochloroacetic acid was 37.5% Temperature and time of 70 ℃ and 90min reaction conditions can be obtained under the optimal synthesis process, the synthesis of lignocarboxylate sodium carboxylation yield and carboxyl content were 93.0% and 2.82mmol / g.



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