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A kind of method for preparing hydroxyethyl cellulose

A technology of hydroxyethyl cellulose and cellulose, applied in the field of cellulose, can solve the problems of unavoidable occupational health risks of acute poisoning, large amount of organic solvents, low production efficiency, etc., so as to reduce hidden safety hazards and occupational health risks, improve The effect of high production efficiency and high production cost

Active Publication Date: 2020-08-07
SHANDONG YITENG NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above washing methods have the problems of large amount of organic solvent in the washing liquid, high washing cost, long recovery cycle, and low production efficiency. Moreover, the washing liquid is flammable and has great potential safety hazards. The use of alcohols cannot avoid the occupational health risks of acute poisoning and chronic poisoning.

Method used

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  • A kind of method for preparing hydroxyethyl cellulose
  • A kind of method for preparing hydroxyethyl cellulose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The method for preparing hydroxyethyl cellulose provided in this embodiment comprises the following steps:

[0026] A. Add 500kg of sodium sulfite and 160kg of caustic soda to the reaction kettle, mix them evenly with the solvent, add 700kg of cotton fibers, and carry out alkalization reaction at 18°C ​​for 1h; add 800kg of ethylene oxide, and carry out etherification reaction at 65°C for 2.5h , to obtain crude hydroxyethyl cellulose. Add sodium sulfite 300kg then in reactor, after mixing, add hydrochloric acid and unnecessary alkali, contain sodium chloride 230kg (theoretical calculation value) in the slurry I that obtains;

[0027] B. Slurry I enters the centrifuge for solid-liquid separation to obtain powder I and solvent;

[0028] C. The powder Ⅰ enters the dryer, and the solvent is recovered until no fraction is evaporated to obtain the powder Ⅱ;

[0029] D. Put the powder material II into the washing tank, add 14T of soft water with a temperature of 18°C ​​and a...

Embodiment 2

[0035] The method for preparing hydroxyethyl cellulose provided in this embodiment comprises the following steps:

[0036] A. Add 160kg of solvent and caustic soda to the reaction kettle, after mixing, add 700kg of cotton fiber, and carry out alkalization reaction at 18°C ​​for 1h; add 800kg of ethylene oxide, and carry out etherification reaction at 65°C for 2.5h to obtain hydroxyl Ethyl cellulose crude product, after adding acetic acid to neutralize unnecessary alkali, contains sodium acetate 320kg (theoretical calculation value) in the slurry I that obtains;

[0037] B. Add 600 kg of disodium hydrogen phosphate into the reaction kettle, stir for 20 minutes, and obtain slurry II;

[0038] C. Slurry II enters the centrifuge for solid-liquid separation to obtain powder I and solvent;

[0039] D. The powder Ⅰ enters the dryer, and the solvent is recovered until no fraction is evaporated to obtain the powder Ⅱ;

[0040]E. Put the powder material II into the washing tank, add 1...

Embodiment 3

[0045] The method for preparing hydroxyethyl cellulose provided in this embodiment comprises the following steps:

[0046] A. Add 160kg of solvent and caustic soda to the reaction kettle, add 700kg of cotton fiber after mixing, and carry out alkalization reaction at 18°C ​​for 1 hour. Add 800kg of ethylene oxide, carry out etherification reaction at 65°C for 2.5h, and obtain crude hydroxyethyl cellulose. After adding nitric acid to neutralize unnecessary alkali, contain sodium nitrate 340kg (theoretical calculation value) in the slurry I that obtains;

[0047] B. Add 200 kg of disodium hydrogen phosphate and 500 kg of sodium sulfite into the reactor, stir for 30 minutes to obtain slurry II;

[0048] C. Slurry II enters the centrifuge for solid-liquid separation to obtain powder I and solvent;

[0049] D. The powder Ⅰ enters the dryer, and the solvent is recovered until no fraction is evaporated to obtain the powder Ⅱ;

[0050] E. Put the powder material II into the washing ...

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Abstract

The invention discloses a method for preparing hydroxyethyl cellulose. The method for preparing hydroxyethyl cellulose includes the process of preparing hydroxyethyl cellulose through alkalization, etherification, pH adjustment, washing and desalting, and solid-liquid separation of cellulose raw materials. Before washing and desalting, the method further includes: The step of adding a precipitating agent; and / or the step of adding a cross-linking agent is also included between the pH adjustment and the washing and desalination. The method for preparing hydroxyethyl cellulose enables hydroxyethyl cellulose to inhibit dissolution and / or delay dissolution in water, achieve water washing and demineralization, and ensure product quality. Compared with traditional production processes, the washing solution does not use organic solvents. , There is no washing solvent recovery process, the production cost is significantly reduced, the safety hazards and occupational health risks caused by the use of organic solvents are reduced, and the washing efficiency is high, the washing purpose can be achieved in one wash, saving washing time and improving production efficiency.

Description

technical field [0001] The invention belongs to the technical field of cellulose, in particular to a method for preparing hydroxyethyl cellulose. Background technique [0002] Hydroxyethylcellulose (HEC) is a white or light yellow, odorless, non-toxic fibrous or powdery solid, which belongs to non-ionic soluble cellulose ethers. Because HEC has good properties of thickening, suspending, dispersing, emulsifying, bonding, film-forming, protecting moisture and providing protective colloid, it has been widely used in petroleum exploration, coatings, construction, medicine, food, textile, papermaking and polymer Polymerization and other fields. [0003] Ash content, that is, the residual amount of inorganic salts generated during the reaction process is an important parameter to measure the quality of hydroxyethyl cellulose. In order to remove the inorganic salts generated by the reaction, the product needs to be washed repeatedly with washing liquid. "Synthesis and Application...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B11/08C08B15/10
CPCC08B11/08C08B15/10
Inventor 滕鲲李青华刘涛李长胤滕波张燕
Owner SHANDONG YITENG NEW MATERIAL CO LTD
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