Solvent recovery process for solvent method cellulose fiber preparation

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...

AI Technical Summary

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-274435, the cation exchange resin of styrene / divinylbenzene copolymer with sulfonic acid group is used. Although this method can remove morpholine, part of NMMO and NMM are also removed at the same time, thereby reducing the Solvent recovery, in addition, it does not remove colored impurities

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