Method for separation of polyvinyl alcohol from aqueous solution

Details Method for separation of polyvinyl alcohol from aqueous solution Method for separation of polyvinyl alcohol from aqueous solution

1991-05-10

1992-05-05

Silverman, Stanley S.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210759, 210908, 210724, 210774, 525 61, 28166, 28168, C02F 172

Patent

active

051104814

ABSTRACT:
A method for separation of PVA from an aqueous solution thereof such as the waste water containing PVA from the pretreatment of a textile product, in which a peroxosulfate such as ammonium peroxosulfate is added to an aqueous PVA solution, particularly in an acidic condition with addition of sulfuric acid, at a temperature above 70.degree. C. for the separation of PVA, and as a result the thus separated PVA contains only a small amount of water in the range of about 60-70% and can easily be treated.

REFERENCES:
patent: 3232869 (1966-02-01), Gard
patent: 3318856 (1967-05-01), Deyrup
patent: 3518242 (1970-06-01), Chrisp
patent: 4078129 (1978-03-01), Yamagata et al.
patent: 4202745 (1980-05-01), Exner et al.
patent: 4331539 (1982-05-01), Schenk et al.
patent: 4416786 (1983-11-01), Knorre et al.
patent: 5026485 (1991-06-01), Anderson

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