Solvent recovery process for solvent method cellulose fiber preparation

A cellulose fiber, preparation process technology, applied in the direction of rayon recovery, fiber chemical characteristics, sustainable manufacturing/processing, etc., can solve the problem that colored impurities cannot be removed, morpholine and metal ions cannot be completely removed, and the solvent recovery rate can be reduced. problems, to achieve the effect of feasible process, improved fiber quality, and reduced burden

Inactive Publication Date: 2005-04-06
DONGHUA UNIV
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Problems solved by technology

[0007] 2. Suspended impurities
[0009] 3. Colored impurities
In DD-A-254199, use with -CH 2 N(CH 3 ) 2 Anion exchange resin of styrene/divinylbenzene copolymer with tertiary group, this method can remove colored impurities, but cannot completely remove morpholine and metal ions
In DD-A-2744

Method used

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  • Solvent recovery process for solvent method cellulose fiber preparation
  • Solvent recovery process for solvent method cellulose fiber preparation

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Embodiment Construction

[0048] Such as figure 1 , The specific process is as follows: 1. Coarse filtration; 2. Fine filtration; 3. Anion resin exchange treatment; 4. Cationic resin exchange treatment; 5. Oxidation treatment; 6. Solvent recovery storage tank. in:

[0049] 1. Coarse filtration, the circulating waste liquid generated in production flows through a stainless steel filter column with a length of 1m and an inner diameter of 10cm at a flow rate of 10m / h. The upper, middle and lower sections of the column are respectively equipped with a filter with a height of 25cm Capacity of anthracite, pumice and gravel as filter media, the particle size is 10 ~ 20mm, 5 ~ 10mm, 2 ~ 4mm. Larger suspended solids are removed, and the crude filtrate is collected and stored in storage tank (1).

[0050] 2. Fine filtration. After coarse filtration, larger suspended impurities have been removed, but there are still smaller suspended particles in the filtrate, especially suspended particles with a particle size...

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Abstract

In the chemical fiber manufacturing industry solvent extraction cellulose textile fiber preparation process the solvent recovery craft, first uses the spinning productive cycle waste liquid thickly filters out eliminates is bigger than 9um the aerosol impurity; The zirconium oxide membrane essence which again if the outer wall spreads through the pore ceramics tube which has the process agglutinates round trip to filter the system to eliminate is bigger than 1um the shot; Then uses the anion resin to remove the colored decomposition matter; Then through the reasonable choice cation exchange resin, uses it adsorptive attraction to be bigger than according to the metallic ion was equal to Maring is bigger than NMM to be bigger than NMMO the choice exchange order characteristic, removes the metallic ion and Maring; Finally turns into the NMM oxygen NMMO. The above five processing sequence synthesis composes a recycling systems engineering, has removen the many kinds of impurities, and effectively has recycled solvent NMMO, improved the textile fiber quality and the craft security, this craft is feasible, highly effective.

Description

technical field [0001] The invention relates to a solvent recovery process in the process of solvent-based cellulose fiber spinning in the chemical fiber manufacturing industry. Specifically, it refers to the effective recovery of solvent N by removing various impurities in the spinning production cycle waste liquid by integrating various recovery methods. - Process technology of methyl morpholine oxide (NMMO). Background technique [0002] As early as the 1930s, a patent (US92,179,181) proposed that tertiary amine oxide NMMO, that is, N-methylmorpholine oxide, could be used to directly dissolve cellulose to produce Lyocell, a solvent-process cellulose fiber with better performance than viscose. Its composition is still a cellulose structure, and the product waste is naturally degraded. It is considered to be a kind of green environmental protection fiber with very good comprehensive performance. It has the comfort of cotton fiber, the strength of polyester fiber, the drapa...

Claims

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Application Information

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IPC IPC(8): D01F13/02
CPCY02P70/62
Inventor 岳文涛邵惠丽章潭莉周美华胡学超
Owner DONGHUA UNIV
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