Gas separation: processes – Selective diffusion of gases – Selective diffusion of gases through substantially solid...
Patent
1996-05-16
1997-09-23
Spitzer, Robert
Gas separation: processes
Selective diffusion of gases
Selective diffusion of gases through substantially solid...
95 90, 95 96, 95115, 95143, B01D 5322, B01D 5304
Patent
active
056699590
ABSTRACT:
A process is disclosed for the shut-down of a membrane separation zone comprising a non-permeate side and a permeate side and processing a feed stream comprising a non-permeable component, a less-readily permeable, condensible component, and a readily permeable component. When the feed stream is not passed to the membrane separation zone, a purge stream is passed to the non-permeate side of the membrane separation zone to remove a residual gas stream and thereby prevent condensation of the less-readily permeable, condensible component upon depressurization and/or cooling of the membrane separation zone. The invention reduces the need for oversizing membrane system which reduces treating costs and prevents permeate damage to membrane surfaces caused by condensation of less-readily permeable, condensible components such as C.sub.6.sup.+ hydrocarbons.
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Dolan William B.
Doshi Kishore J.
McBride Thomas K.
Silverman Richard P.
Spitzer Robert
Tolomei John G.
UOP
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