Vapor recovery from particles containing same

Details Vapor recovery from particles containing same Vapor recovery from particles containing same

1983-05-17

1985-02-12

Schofer, Joseph L.

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

Synthetic resins

Treating polymer containing material or treating a solid...

528497, 528498, C08F 600, C08G 0000, C08J 300

Patent

active

044992637

ABSTRACT:
A system for recovering vapor, such as residual isobutane, from powder, such as polyethylene powder, comprises surge vessel and a two-compartment purge column. The polymer passes through the surge vessel by means of valves such as ball valves on the inlet and outlet of the surge vessel. Hot vapor, such as isobutane, is used to strip a large portion of the residual isobutane from the polyethylene in the top section of the purge column. Part of the isobutane leaving the column goes to a hydrocarbon recovery section and part is heated and recycled as the stripping medium. In the bottom section, nitrogen is used to strip the remaining isobutane from the polymer. An analyzer controller sensing nitrogen in the isobutane stream to recovery controls pressure in the bottom section by manipulating a valve in the nitrogen off-gas line from the bottom section to control the nitrogen content of the isobutane stream being recycled as stripping medium.

REFERENCES:
patent: 3190867 (1962-02-01), Oldweiler et al.
patent: 3279087 (1966-10-01), Hearne et al.
patent: 3318804 (1967-05-01), Van Pool et al.
patent: 3612144 (1971-10-01), Marcum et al.
patent: 3622553 (1971-11-01), Cines
patent: 3734400 (1973-05-01), Pfeiffer et al.
patent: 3869807 (1975-03-01), Perry
McCabe et al., Unit Operations of Chemical Engineering, 1956, p. 772.

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