Solvent recovery method of Lyocell fibers

A recovery method and solvent technology, applied in the field of solvent recovery of Lyocell fiber, to achieve the effect of streamlining, effective and easy to obtain

Active Publication Date: 2011-11-09
骏隆翔(厦门)纤维科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although there is currently a technology to recover NMMO solvent in the Lyocell process, in order to further reduce the manufacturing cost and increase the price competitiveness of Lyocell fiber, there is still continuous development and use of more streamlined equipment and procedures, and can achieve better efficiency recovery method requirements

Method used

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  • Solvent recovery method of Lyocell fibers
  • Solvent recovery method of Lyocell fibers
  • Solvent recovery method of Lyocell fibers

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Embodiment Construction

[0026] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0027] refer to figure 2 , a preferred embodiment of the solvent recovery method for Lyocell fibers of the present invention, used to reclaim a large amount of washing liquid containing low-concentration NMMO solvents produced by the Lyocell fiber process. The Lyocell fiber process mainly includes pulping, dissolving, spinning and washing Four processing steps. In addition to the NMMO solvent used to dissolve the cellulose raw material, the washing liquid produced by the fiber manufacturing process also contains a small amount of NMM. NMM is formed by the cracking of NMMO due to heating during the process of dissolving cellulose. of. A preferred embodiment of the recovery method includes the following steps.

[0028] Step 101 is decolorization. Since the dissolution step of the Lyocell fiber manufacturing process is accompanied by heating to improv...

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Abstract

The invention discloses a solvent recovery method of Lyocell fibers, comprising the following steps: processing collected Lyocell fibers into a washing liquor, introducing the washing liquor to a decolouring groove, using active carbon powder to decolor through suspension, then removing the active carbon and impurities from the decolored washing liquor by a two-stage filtration containing prefiltration and ultrafiltration, removing the water from the washing liquor by one of the following two methods: mechanical vapor recompression condensation method and triple effect evaporation vapor condensation method, so as to obtain a recovered solution with the solvent concentration which coincides with fiber processing. Because the recovery process is simple, the devices used in conjunction with the process are not complicate, easy to access, and suitable for using in the recovery of a large amount of low concentration washing liquor, so that the invention has competitive recovery cost, recovery efficiency and quality of the recovered solution, and has practicability and environmental nature.

Description

technical field [0001] The invention relates to a method for recovering a solvent used in a fiber manufacturing process, in particular to a method for recovering a solvent for Lyocell fibers. Background technique [0002] Lyocell fiber is made of natural cellulose, so its waste can be degraded naturally without causing environmental problems. In addition, Lyocell fiber also has physical and mechanical strength close to synthetic fibers, and has good drapability, thick hand feeling, comfortable touch, Good hygroscopicity, easy to dye, easy to blend with other natural fibers or synthetic fibers, and good texture and processability, it is a fiber product with high performance and high added value. [0003] refer to figure 1 , the existing Lyocell fiber process is mainly divided into steps such as pulping, dissolving, spinning and washing, wherein, pulping is to add n-methyl morpholine oxide (N-Methyl Morpholine N-Oxide, referred to as NMMO) solvent to dissolve cellulose, afte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F13/02
CPCY02P70/62
Inventor 周文东赖明毅黄坤山
Owner 骏隆翔(厦门)纤维科技有限公司
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