Method for preparing hydroxyethyl cellulose

A technology of hydroxyethyl cellulose and cellulose is applied in the field of cellulose ether processing to achieve the effects of increased yield, good purity and high utilization rate

Inactive Publication Date: 2008-08-27
JIANGSU FEIXIANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a method for preparing hydroxyethyl cellulose with less solvent consumption, low energy consumption and greatly reduced overall cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] In a 100L coulter-stirred horizontal reactor, 9 kg of pulverized cellulose, 15.5 kg of acetone, and 0.45 kg of water were added. Close the reactor with N 2 The air in the reactor was replaced, and 5.8 kg of 30% sodium hydroxide aqueous solution was added. Control the temperature of the alkalization reaction at 20-30°C. After reacting for 2.5 hours, add 9kg of ethylene oxide, slowly raise the temperature, control the reaction pressure at 0.3-0.4MPa, and keep the temperature for 3 hours when the temperature rises to 75°C. Cool down, add glacial acetic acid to neutralize to pH 5-7, add 100g glyoxal for crosslinking, discharge, transfer to refining step: wash with acetone aqueous solution, separate, dry and pulverize to obtain hydroxy Ethyl cellulose.

Embodiment 2

[0019] In a 100L coulter-stirred horizontal reactor, 7 kg of pulverized cellulose, 22.5 kg of isopropanol, and 0.30 kg of water were added. Close the reactor with N 2 The air in the reactor was replaced, and 4.5 kg of 40% aqueous sodium hydroxide solution was added. Control the temperature of the alkalization reaction at 10-20°C. After reacting for 3 hours, add 10kg of ethylene oxide, slowly raise the temperature, control the reaction pressure at 0.45-0.55MPa, when the temperature rises to 60°C, keep the temperature for 4 hours. Cool down, add hydrochloric acid to neutralize to a pH value of 5-7, discharge, wash with isopropanol aqueous solution, add 50 g of glyoxal for crosslinking, separate, dry, and pulverize to obtain hydroxyethyl cellulose with an MS of 3.0.

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PUM

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Abstract

The invention discloses a method for using plugh mixing type horizontal reactor to produce hydroxyethylcellulose, which comprises adding cellulose at 50-90% of reactor volume, solvent at 0.5-5.0 mass times of the cellulose, water and sodium hydroxide into a reactor, exchanging the air in the reactor via nitrogen gas, processing alkalization reaction, adding ethylene oxide into the reactor, processing etherification reaction, adding acid into the reactor to neutralize, and controlling pH value at 4.5-8.0, to obtain the paste containing hydroxyethylcellulose, and refining to obtain the hydroxyethylcellulose whose hydroxyethyl MS (mol substituent degree) is 1.6-3.5. The invention has the advantages of low solvent consumption, high device effective utilization, high product yield, high purity, low energy consumption, low solvent loss and low compressive cost, which is suitable for energy saving and low pollution discharge.

Description

technical field [0001] The invention relates to the field of cellulose ether processing, in particular to a method for producing hydroxyethyl cellulose. Background technique [0002] Hydroxyethyl cellulose is a white to slightly yellow powder with good properties of thickening, suspending, dispersing, emulsifying, adhering, film-forming, protecting moisture and providing protective colloid. , medicine, food, daily chemical industry, oil field exploitation, polymer synthesis, agriculture, ceramic industry and other fields have a wide range of uses. [0003] During the production of hydroxyethyl cellulose, purified cellulose is reacted with sodium hydroxide to produce swollen alkaline cellulose. This alkaline cellulose has a strong reactivity, and ethylene oxide via SN 2 Nucleophilic substitution reaction to obtain water-soluble hydroxyethyl cellulose. [0004] At present, the production of hydroxyethyl cellulose is mainly carried out in vertical reactors. The vertical rea...

Claims

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Application Information

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IPC IPC(8): C08B11/08
Inventor 卞亚洲王海涛候石峰黄德周
Owner JIANGSU FEIXIANG CHEM
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