Process for the separation of polyvinyl alcohol from aqueous sol

Details Process for the separation of polyvinyl alcohol from aqueous sol Process for the separation of polyvinyl alcohol from aqueous sol

1978-01-05

1979-08-28

Wyse, Thomas G.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

210 53, C02B 118, C02C 502

Patent

active

041660331

ABSTRACT:
In order to protect the environment from pollution, it is desirable to keep the polyvinyl alcohol content in waste waters as low as possible. Polyvinyl alcohol may be removed from waste waters by means of microorganisms on the the one hand, and on the other according to chemical/mechanical methods by salting-out and precipitation and subsequent separation of the solids. Advantageous is the precipitation in the form of a polyvinyl alcohol/boric acid/didiol complex, especially by means of alkaline earth metal hydroxides in an alkaline medium. Calcium hydroxide is a particularly suitable alkaline earth metal hydroxide.

REFERENCES:
patent: 3761406 (1973-09-01), Tsuk
patent: 4066541 (1978-01-01), Sando et al.

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