Gas separation: processes – Selective diffusion of gases – Selective diffusion of gases through substantially solid...
Patent
1992-05-06
1993-11-09
Spitzer, Robert
Gas separation: processes
Selective diffusion of gases
Selective diffusion of gases through substantially solid...
96 10, B01D 5322, B01D 7168
Patent
active
052598691
ABSTRACT:
Valuable process gas is dried to a low water content, for example a dew point of less than -20.degree. F., using membrane separation in which compression of the permeate gases and condensation and separation of liquid water from the permeate stream is combined with a total recycle of uncondensable permeate gases so that no process gas is lost as a result of the drying operation. Feed gas is combined with the recycled gas either prior to compressing, cooling and separating the liquid water from the process gas or subsequent to these steps, depending upon the pressure of the available feed stream to be dried. Membrane separation efficiency is improved by sweeping the downstream surfaces of the membrane with dried product gas. All of the sweep gas is recaptured with the permeate gases and returned to the separation unit, thereby enabling 100%, recovery of the fresh feed gas from the drying operation. Only liquid water and dissolved gases are purged from the system.
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Letter from Arthur W. Rice, Permea, St. Louis, MO, to Mr, John Tolhurst, Kingsgrove, N.S.W. Australia, dated Aug. 13, 1990.
Auvil Steven R.
Choe Jung S.
Kellogg, Jr. Lyndon J.
Gourley Keith D.
Marsh William F.
Permea Inc.
Simmons James C.
Spitzer Robert
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