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New technique for preparing cellulose carbate through urea embedding method

A technology of carbamate and cellulose, applied in the field of preparing cellulose carbamate, to achieve the effects of good spinnability, low investment cost and shortened production cycle

Inactive Publication Date: 2005-10-26
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is still difficult to obtain CC with high conversion rate and uniform reaction in this process, and the reaction described in this process is carried out under certain pressure conditions, so there is also the problem of energy consumption

Method used

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  • New technique for preparing cellulose carbate through urea embedding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] After shredding 100 kg of cotton pulp with a degree of polymerization of 621 and adding 1000 L of 15% sodium hydroxide solution into a 2000-liter reactor, turn on the agitator at 30° C. to fully mix the cellulose and sodium hydroxide solution, Stop stirring after 30 minutes, wash with water of the same temperature to remove free lye. After that, add 150 kg of urea to the alkali fiber containing moisture, and fully mix the two in the batching tank. After the urea particles cannot be seen, put the material into the CC synthesis reaction kettle, add 800 kg of inert solvent xylene, and start Stirrer and start to heat up. When the temperature rises to 85°C, there will be distilled matter, and the moisture will be completely removed in nearly 1 hour, and the temperature will quickly rise to 137°C; stop heating after this state lasts for 2 hours, and wait for the temperature to drop to 90°C Stop stirring, recover xylene, then wash the product with hot water at 40°C to separate...

Embodiment 2

[0047] After shredding 100 kg of cotton pulp with a degree of polymerization of 540 and adding 1000 L of 12% sodium hydroxide solution into a 2000-liter reactor, turn on the agitator at 40° C. to fully mix the cellulose and sodium hydroxide solution, After 40 minutes, stop stirring and wash with water of the same temperature to remove free lye. Then add 200 kg of urea to the alkali fiber containing water, mix the two fully in the batching tank, put the material into the CC synthesis reaction kettle after the urea particles are invisible, add 1000 kg of inert solvent xylene, and start Stirrer and start to heat up. When the temperature rises to 85°C, there will be distilled matter, and the moisture will be completely removed in nearly 1 hour, and the temperature will quickly rise to 130°C; stop heating after this state lasts for 2 hours, and wait for the temperature to drop to 90°C Stop stirring, recover xylene, then wash the product with water at a temperature of 50°C to separa...

Embodiment 3

[0049] Add 100kg of cotton linters with a degree of polymerization of 420 and 1000L of 12% sodium hydroxide solution into a 2000-liter reactor, turn on the agitator at 50°C to fully mix the cellulose and sodium hydroxide solution, and stop after 20 minutes Stir and rinse with water of the same temperature to remove free lye. Then add 250 kg of urea to the alkali fiber containing a certain amount of moisture, fully mix the two in the batching tank, put the material into the CC synthesis reaction kettle after the urea particles are invisible, add 1500 kg of inert solvent xylene, Turn on the agitator and start to heat up. When the temperature rises to 85°C, there will be distilled matter, and the moisture will be completely removed in nearly 1 hour, and the temperature will rise to 135°C quickly; stop heating after this state lasts for 2 hours, and wait for the temperature to drop to 90°C Stop stirring at ℃, recycle xylene, then wash the product with water at 70 ℃ to separate it ...

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Abstract

The new process for preparing cellulose carbamate by using urea intercalation method includes the following steps: fully activating cellulose paste in alkaline liquor and filtering, then mixing activated cellulose with urea fully, and making them produce reaction in an inert solvent system so as to form cellulose carbamate. After the reaction is completed, the inert solvent can be separated from reaction mixture, the obtained product can be washed with hot water and purified, and the by-product in the washing liquor can be recovered and reused.

Description

technical field [0001] The invention relates to a new process for preparing cellulose carbamate by urea embedding method. Background technique [0002] Cellulose carbamate (abbreviated as CC) is a kind of cellulose ester, which has been used in textile as a substitute of cellulose xanthate. This not only solves the pollution of the environment, realizes the full utilization of cellulose, but also provides a better place for the utilization of low value-added products such as urea. [0003] The development of cellulose carbamate production process essentially provides a new and excellent raw material for the viscose process to produce cellulose fibers. Cellulose carbamate has a wide range of applications and can be used to produce films, granules, special paper and non-woven fabrics. In all applications, the final product may be coacervated cellulose carbamate or regenerated cellulose converted from cellulose carbamate. [0004] In addition, the cellu...

Claims

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Application Information

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IPC IPC(8): C08B3/14
Inventor 吾满江·艾力哈丽丹·买买提董昕努尔买买提
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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