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
CN102234852AActive Publication Date: 2011-11-09骏隆翔(厦门)纤维科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
骏隆翔(厦门)纤维科技有限公司
Publication Date
2011-11-09

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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.
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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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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