Chemische Werke Huls Aktiengesellschaft

Peter Rauth

Karl-Heinz Schoenberg

Hermann Winter

Bernhard Hentschel

Bernd Terwiesch

Rudolf Schleicher

Hans Grosse-Wortmann

Juergen Walther

Residual vinyl chloride contents of aqueous polyvinyl chloride dispersions is reduced to less than 50 ppm by withdrawing steam and vinyl chloride contained in a boiling aqueous polyvinyl chloride dispersion at a temperature of 80.degree.-100.degree. C. and at a vaporization rate per minute of 0.006-0.2 kg. steam per kg. of polyvinyl chloride for a period of time from 3-60 minutes until a vinyl chloride content of less than 50 p.p.m. is achieved.

Process for the removal of vinyl chloride from polyvinyl chloride

A method for removing at least a portion of dissolved gases from a liquid dispersion utilizing a closed, cylindrical tower with an inlet in its upper portion, a tank at the bottom of the tower for collecting liquids, a central pipe in the tower open at each end, the upper end extending above the inlet and the lower end terminating above the level of the collected liquids in the tank and a plurality of inclined surfaces mounted around the central pipe and providing a flow path for the dispersion, each of the plurality of inclined surfaces being shaped and positioned to reverse the direction of flow and dimensioned to form an annular gap between the inclined surfaces and the wall of the tower, the inclined surfaces forming an angle of about 45.degree. to 80.degree. with the central pipe.

Process for the removal of gaseous monomers from polyvinyl

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Bochum, Germany

Peter Rauth