Recovery of organic solvent

有機溶媒の回収方法

Abstract

(57)【要約】 【課題】 紡糸廃液から有機溶媒を回収する方法におい て、効率の高い工業的に有利な回収方法を提供する。 【解決手段】 紡糸廃液から有機溶媒を予め除去して得 た濃縮液と貧溶媒とを混合して高分子物質を固化し、し かる後に残余の有機溶媒を回収する。
PROBLEM TO BE SOLVED: To reduce the production cost and reutilize resources by solidifying a polymeric substance and efficiently recovering an organic solvent from a spinning waste liquid containing the polymeric substance and the organic solvent. SOLUTION: A concentrated liquid produced by removing a part of an organic solvent such as dimethyl sulfoxide from a spinning waste liquid is mixed with a poor solvent to solidify a polymeric substance such as polyvinyl alcohol or a vinyl ester polymer and then the remaining organic solvent is recovered. The poor solvent is e.g. methanol, ethanol or acetone. COPYRIGHT: (C)1997,JPO

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