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Method of Recovering Aqueous N-methylmorpholine-N-Oxide Solution Used in Production of Lyocell Fiber

a technology of lyocell fiber and n-methylmorpholinenoxide, which is applied in the field of recovering an aqueous n-methylmorpholinenoxide solution used in the production of lyocell fiber, can solve the problem of high cost of nmmo solvent and achieve the effect of facilitating nmmo recovery and enhancing nmmo recovery efficiency

Inactive Publication Date: 2011-09-22
ACELON CHEM & FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Therefore, the object of the present invention is to provide a method of recovering an aqueous N-methylmorpholine-N-oxide (NMMO) solution used in production of Lyocell fiber to facilitate NMMO recovery and to enhance NMMO recovery efficiency.

Problems solved by technology

However, the NMMO solvent is costly.

Method used

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  • Method of Recovering Aqueous N-methylmorpholine-N-Oxide Solution Used in Production of Lyocell Fiber
  • Method of Recovering Aqueous N-methylmorpholine-N-Oxide Solution Used in Production of Lyocell Fiber
  • Method of Recovering Aqueous N-methylmorpholine-N-Oxide Solution Used in Production of Lyocell Fiber

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Embodiment Construction

Referring to FIG. 2, according to the present invention, the preferred embodiment of a method of recovering an aqueous N-methylmorpholine-N-oxide (NMMO) solution used in production of Lyocell fiber includes steps 101-104. The conventional method of producing Lyocell fiber shown in FIG. 1 is also illustrated in FIG. 2. After the washing step for production of Lyocell fiber, an aqueous NMMO solution having a low concentration of NMMO is formed. In addition to NMMO, the aqueous NMMO solution also contains a trace of N-methylmorpholine (NMM) that arises from cleavage of NMMO, which is caused by heating during the dissolving step.

Step 101 is decoloring of the aqueous NMMO solution. Even though heat energy provided during the dissolving step of the conventional method of producing Lyocell fiber is able to increase dissolving efficiency, the heat energy gives rise to coloration. Therefore, the aqueous NMMO solution contains pigments and is required to be decolored. Referring to FIG. 3, the...

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Abstract

A method of recovering an aqueous N-methylmorpholine-N-oxide (NMMO) solution used in production of Lyocell fiber includes: decoloring the aqueous NMMO solution by mixing the same with activated carbon using an agitation blower and by alternately energizing and de-energizing the agitation blower to contact the activated carbon with the aqueous NMMO solution thoroughly in an energy-efficient manner; filtering the aqueous NMMO solution which has been decolored through coarse filtration followed by ultrafiltration to remove the activated carbon and impurities from the aqueous NMMO solution; and concentrating the aqueous NMMO solution which has been filtered using one of a mechanical vapor recompression evaporator and a triple effect evaporator to remove water from the aqueous NMMO solution.

Description

CROSS-REFERENCE TO RELATED APPLICATIONThis application claims priority of Taiwanese application no. 099107591, filed on Mar. 16, 2010.BACKGROUND OF THE INVENTION1. Field of the InventionThis invention relates to a method of recovering a solvent used in production of fiber, more particularly to a method of recovering an aqueous N-methylmorpholine-N-oxide solution used in production of Lyocell fiber.2. Description of the Related ArtLyocell fiber is made from natural cellulose. Consequently, waste products of Lyocell fiber are naturally decomposable and are environmentally friendly. Lyocell fiber has mechanical strength similar to that of synthetic fiber, a good draping property, a sufficient thickness, and nice hygroscopicity. Furthermore, Lyocell fiber is comfortable to touch, is easy to be dyed, can be easily blended with natural or synthetic fiber different from Lyocell fiber, and can be easily processed.Referring to FIG. 1, a conventional method of producing Lyocell fiber includes...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D21C11/00
CPCD21C11/0007D01F13/02Y02P70/62
Inventor CHOU, WEN-TUNGLAI, MING-YIHUANG, KUN-SHAN
Owner ACELON CHEM & FIBER
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