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Modification method of cellulose ether product

A technology of cellulose ether and cellulose, which is applied in the field of modification of cellulose ether products, can solve the problems of reduced reaction mass transfer efficiency, large production environmental pollution, and high cost of solvent recovery, so as to improve product drying efficiency and improve substitution uniformity low cost of solvent recovery

Inactive Publication Date: 2006-06-21
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used inert solvents include methanol, ethanol, isopropanol, and toluene. The types and compositions of these solvents have an impact on the reaction of multiphase media, and some solvents are likely to cause environmental pollution when they are recovered.
For example, the solvent used in the production of hydroxypropyl cellulose (HPC) is often water and toluene, which pollutes the production environment and the cost of solvent recovery is high; it is used in the production of cationic cellulose and hydroxyethyl cellulose (HEC). The solvent used is water, isopropanol, and the solvent used during washing is water, isopropanol. Because the content of water cannot be too high, too high will cause the reaction mass transfer efficiency to decline, and too low will cause the washing efficiency to decline; the use of these solvents The reaction efficiency is reduced, and the subsequent washing efficiency and product drying efficiency of the product are adversely affected, which directly leads to the inability to improve the product quality.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Production of Hydroxypropyl Cellulose (HPC):

[0022] First refined cotton cellulose is pulverized, then 1000 kilograms of refined cotton after pulverization, 1200 kilograms of propylene oxide (etherifying agent), 100 kilograms of sodium hydroxide, and 6000 kilograms of solvent (the weight percent of each component of solvent is Water: isopropanol: tert-butanol equals 15%: 25%: 60%) mixed and added to the reaction kettle, first stirred at 20°C for 25 minutes, and then the reaction temperature was raised from 20°C to 97°C within 30 minutes ℃, reacted at 97℃ for 180 minutes; then neutralized the product until the pH value was neutral, and then lowered the product temperature to 37℃ within 50 minutes to remove most of the solvent in the product; add 600 kg of water, 1000 kg of isopropanol and 1400 kg of tert-butanol, stirred and washed for 30 minutes, completed the first cleaning, and removed most of the solvent in the product; then added 600 kg of water, isopropanol 1,00...

Embodiment 2

[0024] Production of Hydroxypropyl Cellulose (HPC):

[0025] First refined cotton cellulose is pulverized, then 1000 kilograms of refined cotton after pulverization, 1100 kilograms of propylene oxide (etherifying agent), 100 kilograms of sodium hydroxide, and 6000 kilograms of solvent (the weight percent of each component of solvent is Water: isopropanol: tert-butanol equal to 5%: 5%: 90%) mixed and added to the reactor, first stirred at 20 ° C for 25 minutes, and then within 30 minutes the reaction temperature was raised from 20 ° C to 65 ℃, react at 65℃ for 300 minutes; then neutralize the product until the pH value is neutral, and then lower the product temperature to 37℃ within 50 minutes to remove most of the solvent in the product; add 300 kg of water, 500 kg of isopropanol and 2200 kg of tert-butanol, stirred and washed for 30 minutes, completed the first cleaning, and removed most of the solvent in the product; then added 300 kg of water, isopropanol 500 kg and 2,200 ...

Embodiment 3

[0027] Production of Hydroxypropyl Cellulose (HPC):

[0028] First refined cotton cellulose is pulverized, then 1000 kilograms of refined cotton after pulverization, 1000 kilograms of propylene oxide (etherifying agent), 100 kilograms of sodium hydroxide, and 6000 kilograms of solvent (the weight percent of each component of solvent is Water: isopropanol: tert-butanol is equal to 35%: 5%: 60%) mixed and added to the reactor, first stirred at 20°C for 25 minutes, and then the reaction temperature was raised from 20°C to 117°C within 60 minutes ℃, react at 117℃ for 30 minutes; then neutralize the product until the pH value is neutral, and then lower the product temperature to 37℃ within 70 minutes to remove most of the solvent in the product; add 1400 kg of water, 200 kg of isopropanol and 1700 kg of tert-butanol, stirred and washed for 30 minutes, completed the first cleaning, and removed most of the solvent in the product; then added 1400 kg of water, isopropanol 200 kg and 1...

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PUM

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Abstract

The invention discloses the modifying method for cellulose ether product, comprising: mixing the reaction raw material with solvent and getting the product, then washing, drying and breaking the product, the solvent used in the reacting and washing course is water, alcohol isopropylicum and butyl alcohol; or water, alcohol isopropylicum and isobutyl alcohol; or water, alcohol isopropylicum and tert-butanol. The invention is characterized by the little pollution to environment, high reaction efficiency, easy to remove solvent and high efficiency for product washing, which effectively improves the quality of cellulose ether product such as hydroxypropyl cellulose (HPC), hydroxypropylmethylcellulose (HPMC),glycol cellulose (HEC), cellulose ethyl ether (EC) and cationic cellulose.

Description

technical field [0001] The invention relates to the field of materials, in particular to a method for modifying cellulose ether products. Background technique [0002] Cellulose ether products include nonionic cellulose, anionic cellulose and cationic cellulose, among which nonionic cellulose includes hydroxypropyl cellulose (HPC), hydroxyethyl cellulose (HEC), hydroxypropyl cellulose Methyl cellulose (HPMC) and ethyl cellulose (EC), etc.; anionic cellulose includes carboxymethyl cellulose, etc.; cationic cellulose is mainly a kind of weak cationic, high molecular weight polymerized quaternary ammonium salt, according to It is divided into three grades of JR, LR and SR according to the difference in the amount of hair adsorbed or the number of quaternary ammonium groups bound to the same length of cellulose molecules. These cellulose ether products have become important chemical raw materials in dozens of industries such as daily chemicals, food, coatings, medicine, pestici...

Claims

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Application Information

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IPC IPC(8): C08B11/02
Inventor 黄少斌
Owner SOUTH CHINA UNIV OF TECH
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