Method of treating wastewater from polymerization process

Details Method of treating wastewater from polymerization process Method of treating wastewater from polymerization process

1990-03-30

1991-06-25

Hruskoci, Peter

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210726, 210904, 210909, C02F 152

Patent

active

050264850

ABSTRACT:
A method is disclosed for treating wastewater from a suspension styrene-acrylonitrile (SAN) copolymerization process. The wastewater contains SAN and polyvinyl alocohol (PVA) as a suspensing agent. The method includes the steps of adding to the wastewater a floc forming effective amount of a) a water soluble borate salt, preferably sodium metaborate and b) a water soluble ferrous salt, preferably ferrous sulfate, and separating the resulting floc which contains the SAN particles and PVA from the treated wastewater.

REFERENCES:
patent: 2129267 (1938-09-01), Fischer
patent: 4078129 (1978-03-01), Yamagata et al.

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