Multiple stage devolatilization process for mass processable pol

Details Multiple stage devolatilization process for mass processable pol Multiple stage devolatilization process for mass processable pol

1981-07-15

1984-03-27

Levin, Stanford M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Treating polymer containing material or treating a solid...

202173, 202205, 422131, 528501, C08F 610

Patent

active

044396015

ABSTRACT:
Disclosed is a multiple-stage flash devolatilization process, and apparatus for use therein, for recovering volatiles from mass processable polymers, which enables optimally low pressures to be employed without the necessity for refrigeration to condense the volatiles recovered thereby, comprising separating the volatiles from the polymeric material by flashing in a first flash devolatilization zone to remove the majority of the volatiles and then flashing in at least one additional flash devolatilization zone maintained at a lower pressure, preferably as low as practically possible, to remove residual volatiles, and then recovering the volatiles for further use by feeding the volatiles recovered from the additional flash zones back into the stream of volatiles leaving the first flash zone, the higher pressure of which allows the combined free volatiles present therein to then be condensed in a conventional non-refrigeration cooling process.

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patent: 3884766 (1975-05-01), Bir et al.
patent: 3945976 (1976-03-01), McCurdy et al.

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