| US 7,591,879 B2 | ||
| Integration of rapid cycle pressure swing adsorption with refinery process units (hydroprocessing, hydrocracking, etc.) | ||
| Narasimhan Sundaram, Fairfax, Va. (US); Bal K. Kaul, Fairfax, Va. (US); Edward W. Corcoran, Easton, Pa. (US); Craig Y. Sabottke, Baton Rouge, La. (US); and Richard L. Eckes, Madison, N.J. (US) | ||
| Assigned to ExxonMobil Research and Engineering Company, Annandale, N.J. (US) | ||
| Filed on Dec. 20, 2005, as Appl. No. 11/312,177. | ||
| Claims priority of provisional application 60/645713, filed on Jan. 21, 2005. | ||
| Prior Publication US 2006/0174764 A1, Aug. 10, 2006 | ||
| Int. Cl. B01D 53/02 (2006.01) | ||
| U.S. Cl. 95—96 [95/100; 95/103; 96/130] | 20 Claims |
| 1. A method for operating a rapid cycle pressure swing adsorption (RCPSA) system having a cycle time, tTOT, to separate a feed gas into product gas and tail (exhaust) gas with a high rate of recovery, comprising:
(a) passing said feed gas having purity F % into a sorbent bed for time, tF, which selectively adsorbs said tail gas and passes said product gas out of said bed, wherein said product gas has a purity
of P % and a rate of recovery of R %,
(b) co-currently depressurizing said bed for a time, tCO,
(c) counter-currently depressurizing said bed for a time, tCN,
(d) purging said bed for a time, tP, wherein desorbate (tail gas or exhaust gas) is released from said bed at a pressure greater than 30 psig, and
(e) repressurizing the bed for a time, tRP, wherein
the cycle time, tTOT, is equal to the sum of the individual cycle times comprising the total cycle time,
tTOT=tF+tCO+tCN+tP+tRP and, wherein
0<tCO/tF≤1/3, and
tCN/tF≤1/4, and
1/5≤tCO/tP,
such thatthe rate of recovery, R %>80% for a product purity to feed purity ratio, P %/F %≧1.1, and/or a rate of recovery, R %>90% for
a product purity to feed purity ratio, 0<P %/F %<1.1.
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