Chemistry of inorganic compounds – Sulfur or compound thereof – Elemental sulfur
Reexamination Certificate
2007-11-13
2007-11-13
Eyler, Yvonne (Department: 1621)
Chemistry of inorganic compounds
Sulfur or compound thereof
Elemental sulfur
C062S617000, C062S619000, C518S700000, C518S702000, C518S704000
Reexamination Certificate
active
11384279
ABSTRACT:
A relatively simple and energy efficient multiple stage cryogenic process for the purification of a hydrogen-rich stream by the removal of acid gases, mainly CO2and H2S, by method of autorefrigeration and delivering or producing those acid gases, mainly CO2, at pressure sufficiently high for disposal by containment, commonly known as sequestration. Autorefrigeration is comprised of (a) condensing acid gases from the syngas stream by cooling the syngas, (b) separating the liquefied acid gases from the syngas, and (c) evaporating the liquefied acid gases at a pressure lower than that of the syngas to provide cooling. The process is composed of multiple autorefrigeration stages to generate multiple acid gas product streams with a pressure as high as practical in each stream so as to lessen the power needed to pressurize the acid gas streams for sequestration. The final autorefrigeration stage utilizes an antifreeze liquid that allows the final stage to operate below the freezing point of CO2; thus allowing more acid gas removal. The antifreeze liquid is an alcohol or a mixture of alcohols with a freezing point lower than about minus 110 degrees F. and a boiling point higher than about 100 degrees F. The process includes hydrogen recovery and recycle as well as recovery of the energy contained in the sulfur bearing compounds. The process is especially well suited for CO2removal/sequestration from a coal (or petroleum coke) gasification process.
REFERENCES:
patent: 3001373 (1961-09-01), Eastman et al.
patent: 3074245 (1963-01-01), Becker
patent: 3349571 (1967-10-01), Nebgen
patent: 3544291 (1970-12-01), Schlinger et al.
patent: 3614872 (1971-10-01), Tassoney et al.
patent: 4378048 (1983-03-01), Madgavkar et al.
patent: 4609388 (1986-09-01), Adler et al.
patent: 4957515 (1990-09-01), Hegarty
patent: 4977745 (1990-12-01), Heichberger
Gas Purification, fifth edition, 1997 A. Kohl et al., pp. 746-747.
Eugene Rosenbaum; Physical Chemistry 1970; pp. 550-552.
Haldor Topsoe, Combustion catalysts designed as the CK/CKM class, brochure cove r sheet and pp. 2-8, no date.
Journal of Chemical and Engineering, Apr. 1968; pp. 168-171, the date is a bit unclear.
Crim Michael C.
McClanahan Timmons S.
Eyler Yvonne
Katakam Sudhakar
Sughrue Mion Pllc.
Tennessee Valley Authority
LandOfFree
Multi-stage cryogenic acid gas removal does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Multi-stage cryogenic acid gas removal, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multi-stage cryogenic acid gas removal will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3878813