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A kind of preparation technology and equipment of cellulose solution

A cellulose solution and preparation technology, applied in the field of cellulose, can solve the problems of uniform mixing and sufficient swelling, and achieve the effects of excellent spinning stability, small particle size and uniform solution

Active Publication Date: 2017-12-05
CHINESE TEXTILE ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The present invention aims to improve the current cellulose mixed swelling and dissolving process, and solve the contradiction between uniform mixing and sufficient swelling and energy consumption existing in the process of mixing swelling and dissolving of high-concentration NMMO and activated pulp in the prior art process. On-line continuous preparation of high-concentration homogeneous spinning solution from pulp with lower concentration of NMMO and without activation treatment

Method used

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  • A kind of preparation technology and equipment of cellulose solution
  • A kind of preparation technology and equipment of cellulose solution
  • A kind of preparation technology and equipment of cellulose solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] (1) 20kg of cellulose pulp (dry-cut pulp COSMO DP500, moisture content 6%) and 167kg of 70°C NMMO aqueous solution are continuously added to the continuous mixing through the pulp continuous feeding device 1 and the NMMO aqueous solution continuous feeding device 2 respectively. In the machine 3, in the continuous mixer 3, stir at a stirring line speed of 60m / min for 30min to obtain the premix solution, and the mass ratio of water to NMMO in the NMMO aqueous solution is 28:72;

[0056] (2) The pre-mixed liquid is continuously pumped into the continuous decompression heating device 4, and the pre-swelling liquid is obtained by decompression evaporation and dehydration. The dehydration pressure in the continuous decompression heating device 4 is 6kPa, and the dehydration temperature is 105°C. The mass ratio of water and NMMO in the pre-swelling liquid at the outlet of the decompression heating device 4 is 19:81;

[0057] (3) Send the pre-swelling liquid continuously into ...

Embodiment 2

[0061] (1) 20kg of cellulose pulp (dry-cut pulp bamboo pulp DP500, moisture content 6%) and 200kg85°C NMMO aqueous solution are continuously added to the In the continuous mixer 3, in the continuous mixer 3, stir at a stirring linear velocity of 120m / min for 20min to obtain a premixed solution, and the mass ratio of water to NMMO in the NMMO aqueous solution is 40:60;

[0062] (2) The pre-mixed liquid is continuously pumped into the continuous decompression heating equipment 4, and the pre-swelling liquid is obtained by decompression evaporation and dehydration. The dehydration pressure in the continuous decompression heating equipment 4 is 4kPa, and the dehydration temperature is 110°C. The mass ratio of water and NMMO in the pre-swelling liquid at the outlet of the decompression heating device 4 is 21:79;

[0063] (3) The pre-swelling liquid is continuously fed into the swelling tank 5, the temperature in the swelling tank 5 is 85° C., the residence time of the pre-swelling ...

Embodiment 3

[0067] (1) 20kg of cellulose pulp (dry-cut pulp cotton pulp DP500, moisture content 6%) and 168kg90°C NMMO aqueous solution are continuously added to the In the continuous mixer 3, in the continuous mixer 3, stir at a stirring linear velocity of 180m / min for 5min to obtain a premixed solution, and the mass ratio of water to NMMO in the NMMO aqueous solution is 35:70;

[0068] (2) The pre-mixed liquid is continuously pumped into the continuous decompression heating equipment 4, and the pre-swelling liquid is obtained by decompression evaporation and dehydration. The dehydration pressure in the continuous decompression heating equipment 4 is 4kPa, and the dehydration temperature is 80°C. The mass ratio of water and NMMO in the pre-swelling liquid at the outlet of the decompression heating device 4 is 25:75;

[0069] (3) The pre-swelling liquid is continuously fed into the swelling tank 5, the temperature in the swelling tank 5 is 55° C., the residence time of the pre-swelling li...

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Abstract

The invention provides a preparation process of a cellulose solution, which selects a lower concentration of NMMO and continuously mixes it online with unactivated pulp, and dehydrates the mixed premixed liquid in an evaporative dehydration device to a concentration of NMMO suitable for swelling, and then Under this condition, it is fully swollen, and the pre-solution after uniform mixing and full swelling is evaporated and dehydrated by thin-film evaporation equipment to obtain a cellulose solution with high concentration, uniform dissolution and excellent consistency. The invention also provides a continuous preparation equipment for the cellulose solution used in the preparation process. The invention solves the contradiction between uniform mixing and sufficient swelling in the preparation process of the high-concentration cellulose solution in the prior art, and avoids the problems of storage and transportation safety in the selection of high-concentration NMMO in the traditional technology, and the pulp used in the present invention No activation required, low energy consumption. The technical process of the invention is safer, energy-saving and efficient, and is convenient for industrialized continuous production.

Description

technical field [0001] The invention belongs to the field of cellulose, and in particular relates to a preparation process and equipment for a cellulose solution. Background technique [0002] Cellulose fiber is favored by people because of its renewable raw materials, excellent performance, and wide application. However, the current processing technology of cellulose fiber is still dominated by the traditional viscose method, which pollutes the environment during the production process. Gradually by the people's attention, it is urgent to develop green and environmentally friendly processing technology. In the 1990s, the processing technology of directly dissolving cellulose with the organic solvent N-methylmorpholine-N-oxide (NMMO) to prepare the dope spinning completely solved the environmental pollution problem of the viscose method. The fiber is named as Lyocell fiber by BISFA (International Bureau of Standardization of Man-made Fibers). [0003] In the process of dis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/09D01F2/24
CPCD01F2/00D01D1/02C08J3/096D21C9/086D21C9/18D21H11/20C08J2301/02D21C9/005D21C9/007
Inventor 周运安孙玉山王根立程春祖吴振兴迟克栋侯松欣庞雨
Owner CHINESE TEXTILE ACAD
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