RECOVERY OF ORGANIC SOLVENT

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...

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Bibliographische Detailangaben
Hauptverfasser:	KOWAKA TAKESHI, YOKOYAMA KAZUTOMI, SAKANE SOICHI, WATANABE KAZUNORI
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G CHEMISTRY COMPOSITIONS BASED THEREON GENERAL PROCESSES OF COMPOUNDING MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OFARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES ORRIBBONS METALLURGY NATURAL OR ARTIFICIAL THREADS OR FIBRES ORGANIC MACROMOLECULAR COMPOUNDS SPINNING TEXTILES THEIR PREPARATION OR CHEMICAL WORKING-UP WORKING-UP
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Beschreibung
Zusammenfassung:	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.