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Production method for high-viscosity high-purity carboxymethylcellulose by using bamboo pulp as raw material

A technology of carboxymethyl cellulose and production method, which is applied in the field of producing high-viscosity and high-purity carboxymethyl cellulose, can solve problems such as complicated procedures, high viscosity, and environmental pollution, and achieve rich sources, low production costs, and low production costs. Reduced effect

Inactive Publication Date: 2012-11-21
ZHEJIANG FORESTRY UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The process of this method is complicated. The bagasse is processed by physical and chemical methods to obtain fibers. It needs to be treated with acid and alkali when preparing fibers, which pollutes the environment. Addition of sodium hydroxide in ethanol to achieve high viscosity

Method used

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  • Production method for high-viscosity high-purity carboxymethylcellulose by using bamboo pulp as raw material
  • Production method for high-viscosity high-purity carboxymethylcellulose by using bamboo pulp as raw material
  • Production method for high-viscosity high-purity carboxymethylcellulose by using bamboo pulp as raw material

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Embodiment 1

[0019] Embodiment 1 (seeing the corresponding raw materials and parts by weight of Embodiment 1 in the table): add 5 parts by weight of bamboo pulp powder (the same below) in the reactor, add 100 parts of volume ratios and be 90% aqueous ethanol, stir 10-20 Minutes, add 7 parts of NaOH, prepare NaOH into an aqueous solution with a mass ratio concentration of 30%, stir at normal pressure and 20-30°C for 1 hour to generate alkalized cellulose, then add 9 parts of chloroacetic acid, and control the reaction temperature at 60°C , etherification reaction for 2 hours, cooled to room temperature, neutralized to neutral with 80% acetic acid aqueous solution by volume, and suction filtered to obtain a yellow etherified product, which was washed by conventional washing and pressure filtration with a volume ratio of 80% Wash 4 times with ethanol, then wash 1 time with 95% ethanol, dry and pulverize to obtain white fibrous powder, which is the high-viscosity and high-purity carboxymethyl c...

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Abstract

The invention provides a production method for high-viscosity high-purity sodium carboxymethylcellulose by using bamboo pulp as a raw material. The production method comprises the following steps of: carrying out an alkalization reaction and an etherification reaction to 5 parts of bamboo pulp by weight (the same below), 100 parts of 90% of ethanol aquifer based on volume by volume concentration, 5 to 8 parts of 30% of sodium hydroxide aqueous solution based on mass by mass concentration, and 7 to 10 parts of chloroacetic acid at an industrial level; washing via ethanol; pressing and filtering; parching; and crushing to obtain the finished product. The production method provided by the method is the first one to produce high-viscosity high-purity sodium carboxymethylcellulose through raw material with a low content of alpha-cellulose and a low degree of polymerization, and according to the high-viscosity high-purity sodium carboxymethylcellulose, the viscosity is more than 5000 mPas, and the purity is less than or equal to 0.1% based on the mass fraction of the chloride Cl. The production method is rich in raw material resources with low cost, so that the cost of production is greatly reduced. The reaction medium is hydrous ethanol and the washing solvent is the hydrous ethanol as well, so that problem of blending various organic solvents for use can be avoided, and the complex process for respectively recovering is saved. The production method has few processes, is energy-saving, time-saving and labor-saving, and has low production cost.

Description

technical field [0001] The invention relates to a method for producing high-viscosity and high-purity carboxymethyl cellulose (CMC) with bamboo pulp as raw material. Background technique [0002] The industrial manufacture of carboxymethyl cellulose mainly includes water-borne method and solvent method. The solvent method uses an inert organic solvent as the reaction medium, overcomes the inherent disadvantages of poor heat transfer in the water-medium method, improves the uniformity of the reaction, and has good product quality. Therefore, it has become an advanced technology for the production of carboxymethyl cellulose today. The solvent method uses an inert organic solvent as the reaction medium, and is divided into a kneading method and a slurry method according to the amount of the reaction medium. Due to the small amount of solvent used in the kneading method, the infiltration and dispersion of cellulose cannot be fully and completely, and the phenomenon of uneven re...

Claims

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Application Information

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IPC IPC(8): C08B11/12
Inventor 金贞福童再康文桂峰邵顺流
Owner ZHEJIANG FORESTRY UNIVERSITY
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