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Method for preparing hydroxyethyl cellulose with high degree of substitution

A technology of cellulose ether and hydroxyethyl cellulose, which is applied in the field of preparation of hydroxyethyl cellulose ether with a high degree of substitution, can solve the problems of high equipment investment cost, unavoidable exposure to air, and difficult to increase product viscosity.

Inactive Publication Date: 2010-08-11
HENAN XIREN CELLULOSE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of this method is that the equipment investment cost is too high at one time, and most domestic manufacturers use ordinary vertical stirring reactors. If they want to completely replace them, there are problems of funds and time.
This process can also prepare hydroxyethyl cellulose ether with a high degree of substitution, but this preparation method will introduce a lot of impurities because the semi-finished product must be neutralized and alkalized again, and the product will inevitably come into contact with air, so that the product The viscosity is difficult to make high
In addition, the required equipment and operating costs are too high, so this production process was once short-lived in China and was eventually abandoned

Method used

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  • Method for preparing hydroxyethyl cellulose with high degree of substitution
  • Method for preparing hydroxyethyl cellulose with high degree of substitution
  • Method for preparing hydroxyethyl cellulose with high degree of substitution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) pulverizing the raw cellulose of 90 parts by weight;

[0035] (2) Place the pulverized raw cellulose powder in a reaction kettle at a temperature of 0° C., and basify in 500 parts by weight of a catalyst-dissolved alkalized organic solvent and water mixture for 3 hours. The alkalized organic solvent is: methanol solution, The proportion of water in the mixture of alkalized organic solvent and water is 10%, the catalyst is NaOH, and the consumption of catalyst is 4 parts by weight;

[0036] (3) At a temperature of 40°C, add 80 parts by weight of ethylene oxide to the alkalized raw cellulose for 0.5 hour etherification, and the ratio of water in the mixture of ethylene oxide and water is 10%;

[0037] (4) In the etherified raw cellulose, add 8 parts by weight of sulfuric acid to neutralize for 120 minutes;

[0038] (5) Send the neutralized cellulose ether and solvent mixture to a centrifuge for separation;

[0039] (6) Transporting the separated cellulose ether to t...

Embodiment 2

[0042] (1) pulverizing the raw cellulose of 150 parts by weight;

[0043] (2) Place the pulverized raw cellulose powder in a reaction kettle at a temperature of 40° C., and basify in 1500 parts by weight of a catalyst-dissolved basified organic solvent and water mixture for 1 hour. The basified organic solvent is: acetone, alkali The proportion of water in the mixture of organic solvent and water is 20%, the catalyst is KOH, and the consumption of catalyst is 90 parts by weight;

[0044] (3) At a temperature of 90°C, add 85 parts by weight of ethylene oxide to the alkalized raw cellulose for etherification for 3 hours, and the ratio of water in the mixture of ethylene oxide and water is 20%;

[0045] (4) In the etherified raw cellulose, add 80 parts by weight of hydrochloric acid for neutralization for 5 minutes;

[0046] (5) Send the neutralized cellulose ether and solvent mixture to a centrifuge for separation;

[0047] (6) Transporting the separated cellulose ether to the...

Embodiment 3

[0051] (1) pulverizing the raw cellulose of 100 parts by weight;

[0052] (2) Place the pulverized raw cellulose powder in a reaction kettle at a temperature of 8° C., and basify in 1000 parts by weight of a catalyst-dissolved alkalized organic solvent and water mixture for 2 hours. The alkalized organic solvent is: isopropanol and The mixed solvent of butanone, the proportion of water in the mixture of alkalized organic solvent and water is 15%, the catalyst is LiOH, and the consumption of catalyst is 10 parts by weight;

[0053] (3) At a temperature of 50°C, add 90 parts by weight of ethylene oxide to the alkalized raw cellulose for etherification for 1 hour, and the ratio of water in the mixture of ethylene oxide and water is 10-20 %;

[0054] (4) In the etherified raw cellulose, add 25 parts by weight of acetic acid to neutralize for 100 minutes;

[0055] (5) Add 140 parts by weight of ethylene oxide to the alkalized raw cellulose at a temperature of 40° C. for 3 hours to ...

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Abstract

The invention relates to a method for preparing hydroxyethyl cellulose with high degree of substitution. The method prepares the hydroxyethyl cellulose by crushing, alkalifying, etherifying, neutralizing, separating, cleaning and drying a raw material cellulose. The method can produce the hydroxyethyl cellulose with high degree of substitution of between 2.2 and 3.5, and is applicable to production by universally adopted conventional vertical stirring reaction kettle without reforming the conventional equipment when put into production.

Description

technical field [0001] The invention relates to a preparation method of hydroxyethyl cellulose ether with high substitution degree. Background technique [0002] Hydroxyethyl cellulose ether (HEC) is widely used in petrochemical, construction, water-based coatings, daily chemicals and other fields due to its outstanding properties such as thickening, suspension, dispersion and water retention. Highly substituted hydroxyethyl cellulose is widely used in water-based coatings due to its high degree of substitution, high biological stability, and multiple hydroxyl groups, which have stronger water retention, higher low-shear viscosity and lower high-shear viscosity. , toothpaste and cosmetics. [0003] The main reaction for preparing HEC is as follows: [0004] [0005] side effects: [0006] [0007] High degree of substitution HEC products are characterized by uniform substitution, excellent solubility, shear resistance, anti-stickiness, and high temperature resistanc...

Claims

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Application Information

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IPC IPC(8): C08B11/08
Inventor 凡俊琳
Owner HENAN XIREN CELLULOSE
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