E.i. Dupont De Nemours and Company

Bela M Fabuss

Ervin Townsend Powers, Jr

David W Gillespie

A method of improving solvent vapor containment in a process for extruding a solvent-polymer mixture into a process vessel operated substantially at atmospheric pressure while continuously removing solvent vapor and polymer product from said process vessel is disclosed. The improvement involves connecting, by means of a passage, the process vessel with a containment tank, which containment tank is provided at the bottom thereof with means for solvent vapor removal and recovery. The top of the containment tank is provided with an atmospheric vent to ensure that the solvent vapor in the containment tank is at atmospheric pressure. The passage is further provided with a vapor siphon breaker to prevent siphoning of the solvent vapor from the containment tank back into the process vessel.

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Berwyn, PA, United States of America

Bela M Fabuss