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Method for refining hydroxyethylcellulose

A hydroxyethyl cellulose and refining method technology, applied in the field of hydroxyethyl cellulose refining, can solve the problems of low quality of hydroxyethyl cellulose refined products, failure to achieve one-time washing, high moisture content in dryers, etc. Achieve the effect of being conducive to operational flexibility, reducing the labor intensity of workers' operation, and reducing energy and raw material consumption

Inactive Publication Date: 2012-06-13
LUZHOU NORTH CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 3. Because the organic acid has a large molecular weight, the sodium salt formed has low solubility in the washing solvent, and the ash content of the product cannot be reduced to less than 5% after washing once, and the moisture content in the dryer is too high, and the dryer cannot be dried at one time. , must be washed twice and dried twice, and cannot achieve a continuous process of one-time washing and drying
[0009] 4. After drying, the material has been washed twice, and the particles of the dried material are relatively large and relatively hard. During the crushing process, the crushing load is large, and the temperature at the top of the pulverizer reaches 80°C to 120°C, which reduces the crushing capacity.
[0010] To sum up, the current use of organic acids as neutralizers leads to complex subsequent treatment processes, high production costs, and low quality of refined hydroxyethyl cellulose products.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Refined cotton powder 1000Kg etherification reaction prepares HEC crude product, after etherification reaction finishes, add the nitric acid of 45% weight percent concentration to neutralize to pH=2~3, add 80Kg glyoxal as crosslinking agent, crosslinking time 1h, The crosslinking temperature is 25-30°C. After cross-linking, use a screw pump to pump into a drum-type continuous filter press for continuous washing, use 18% isopropanol aqueous solution as washing liquid, and the washing liquid flow rate is 8m 3 / h, the wet content of the filter cake after washing is 53%. Then enter the air-lift continuous dryer and use nitrogen to continuously heat and dry. The nitrogen concentration is greater than 98%, the nitrogen temperature is 140°C, and the drying material discharge temperature is 95°C. The temperature at the top is 60°C, the crushing capacity is 200-600Kg / h, and the fineness of the crushed product is 80 mesh, and the sieve is less than 1%.

[0044]It takes 7 hours ...

Embodiment 2

[0046] The same HEC crude product as in Example 1, after the etherification reaction, add 35% sulfuric acid to neutralize to pH=5-6, add 100Kg glyoxal as a cross-linking agent, cross-linking time 1.5h, cross-linking temperature 45 ℃~50℃. Drive into the filter press with a screw pump for continuous washing, use tert-butanol aqueous solution with a water content of 25% as the washing liquid, and the washing liquid flow rate is 7m 3 / h, the wet content of the filter cake after washing is 60%. Then enter the air-lift continuous dryer and use nitrogen to continuously heat and dry. The nitrogen concentration is greater than 98%, the nitrogen temperature is 145°C, and the drying material discharge temperature is 75°C. The temperature at the top is 60°C, the crushing capacity is 100-300Kg / h, and the fineness of the crushed product is 80 mesh, and the sieve is less than 5%.

[0047] It takes 10 hours to wash, dry, and pulverize the batch of products according to the above-mentioned c...

Embodiment 3

[0049] The same HEC crude product as in Example 1, after the etherification reaction finishes, add the compound inorganic acid of 50% concentration (nitric acid, sulfuric acid composition, weight ratio 1: 1) neutralize to pH=3~4, add 50Kg glyoxal As a cross-linking agent, the cross-linking time is 0.5h, the temperature is 50-55°C, it is pumped into the filter press with a screw pump for continuous washing, and the acetone aqueous solution with a water content of 30% is used as the lotion, and the flow rate of the lotion is 8.5m 3 / h, the wet content of the filter cake after washing is 50%. Then enter the air-lift continuous dryer and use nitrogen to continuously heat and dry. The nitrogen concentration is greater than 98%, the nitrogen temperature is 148°C, and the drying material discharge temperature is 95°C. The temperature at the top is 80°C, the crushing capacity is 200-400Kg / h, and the fineness of the crushed product is 80 mesh, and the sieve is less than 5%.

[0050] I...

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PUM

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Abstract

The invention belongs to the technical field of production methods for hydroxyethylcellulose and particularly relates to a method for refining the hydroxyethylcellulose. The invention aims to solve the technical problem that a method for refining the hydroxyethylcellulose is required to be provided, the method is simple and convenient in technologies, and an obtained product has high quality. The method for refining the hydroxyethylcellulose comprises the following steps of: neutralizing, crosslinking, washing, filtering, drying and crushing, wherein a neutralizer used in the neutralizing step is inorganic acid. By changing the variety of the neutralizer, the continuous production can be performed by the method for refining the hydroxyethylcellulose, the whiteness and free-running property of the product obtained through processing are high, and the stability of the product is higher. In addition, a production line is continuous, so that the production efficiency of the production line is greatly improved, the operating labor intensity of workers is reduced, the essential safety of the production line is improved, and the consumption of energy sources and raw materials is reduced.

Description

technical field [0001] The invention belongs to the technical field of hydroxyethyl cellulose production methods, in particular to a hydroxyethyl cellulose refining method. Background technique [0002] Hydroxyethyl cellulose (HEC) is a white or light yellow, odorless, non-toxic fibrous or powdery nonionic substance prepared by etherification reaction of alkali cellulose and ethylene oxide (or chlorohydrin). Water-soluble cellulose ether. [0003] The main characteristics of HEC are that it is soluble in both cold water and hot water, and has no gel properties. It has a wide range of substitution, solubility and viscosity, good thermal (below 140°C) stability, and does not produce precipitation under acidic conditions. HEC solution can form a transparent film, because it has non-ionic characteristics that do not interact with positive and negative ions and has good compatibility, it can be used as a coating agent, binder, cement and gypsum additive, thickener, suspending ag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B11/08C08B11/20C08J3/24
Inventor 吕玉山冉阳平肖阳海谭敏邱天才杨利芬陈思志杨春张伟张仕明冉启明谢兴连梁鼎郑伦华
Owner LUZHOU NORTH CHEM IND
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