Process for the concentration of polyvinyl-chloride emulsion

Details Process for the concentration of polyvinyl-chloride emulsion Process for the concentration of polyvinyl-chloride emulsion

1973-08-31

1976-05-11

Spear, Jr., Frank A.

Liquid purification or separation

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

Responsive to fluid flow

210 23H, B01D 1300

Patent

active

039561143

ABSTRACT:
A process of concentrating an aqueous polyvinyl-chloride emulsion employing a membrane device comprising a feed zone and a permeate zone, the zones separated by an ultrafiltration semipermeable membrane, which process comprises: introducing the polyvinyl-chloride emulsion to be concentrated into the feed zone; removing a concentrated polyvinyl-chloride emulsion from the feed zone and removing an aqueous fraction from the permeate zone; interrupting the process of concentration periodically when the flux rate of the process falls below a desired flux rate value; and contacting the semipermeable membrane with a solution containing a solvent, such as tetrahydrofurane, for the polyvinyl-chloride for a time sufficient to restore the flux value to its desired level, the semipermeable membrane employed characterized by being solvent-resistant to the solvent employed in contacting the membrane.

REFERENCES:
patent: 3132094 (1964-05-01), McKelvey, Jr. et al.
patent: 3554266 (1971-01-01), Baird et al.
patent: 3663403 (1972-05-01), Christenson et al.

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