Chemistry of hydrocarbon compounds – Purification – separation – or recovery – By contact with solid sorbent
Reexamination Certificate
2002-11-12
2008-03-11
Caldarola, Glenn (Department: 1797)
Chemistry of hydrocarbon compounds
Purification, separation, or recovery
By contact with solid sorbent
C585S822000, C585S823000, C208S20800M, C208S228000, C208S229000, C208S244000, C208S249000, C502S182000, C502S185000
Reexamination Certificate
active
07342145
ABSTRACT:
The present invention relates to a novel process for refining the liquefied petroleum gas (LPG) in a commercial scale. The process comprises: sequentially performing fine desulfurization and mercaptan conversion of the LPG after alcohol amine treatment through desulfurizer and catalyst set in fixed bed reactor in the absence of alkali, wherein, during the fine desulfurization, the resultants of reaction between hydrogen sulfide in the LPG and Fe—Ca oxides or their hydrates adhered on the desulfurizer, and during the mercaptan conversion, the mercaptan in the LPG reacts with the residual trace amount of air in the LPG under the action of the catalyst to produce the disulfides; letting the formed disulfides along with the LPG flow out of the fixed bed reactor; rectifying the LPG after the mercaptan conversion to obtain the refined LPG products, with further rectification to obtain the valuable disulfide products. The present process has advantages of high efficiency, no alkali discharge, being a simplified process over the prior method using alkali treatment and making no environmental pollution.
REFERENCES:
patent: 3725252 (1973-04-01), Maier
patent: 3785964 (1974-01-01), Chun et al.
patent: 4039389 (1977-08-01), Christman
patent: 4040947 (1977-08-01), Christman
patent: 4256728 (1981-03-01), Nishino et al.
patent: 4313820 (1982-02-01), Farha et al.
patent: 4381993 (1983-05-01), Nevitt
patent: 4383916 (1983-05-01), Gutberlet et al.
patent: 4391633 (1983-07-01), Yamauchi et al.
patent: 4626341 (1986-12-01), Verachtert
patent: 4753722 (1988-06-01), Le et al.
patent: 4913797 (1990-04-01), Albinson et al.
patent: 5064525 (1991-11-01), Frame et al.
patent: 5068477 (1991-11-01), Berrebi
patent: 5169516 (1992-12-01), Carr
patent: 5320742 (1994-06-01), Fletcher et al.
patent: 5413701 (1995-05-01), Gillespie et al.
patent: 5659106 (1997-08-01), Frey et al.
patent: 5741415 (1998-04-01), Mazgarov et al.
patent: 5846406 (1998-12-01), Sudhakar et al.
patent: 5868921 (1999-02-01), Barre et al.
patent: 6248230 (2001-06-01), Min et al.
patent: 6306288 (2001-10-01), Pittman et al.
patent: 6495029 (2002-12-01), Schorfheide et al.
patent: 6946111 (2005-09-01), Keller et al.
patent: 1194294 (1998-09-01), None
patent: 1196971 (1998-10-01), None
patent: 1229005 (1999-09-01), None
patent: 195 25 190 (1997-01-01), None
patent: 47-30162 (1972-08-01), None
Liu Zhenyi
Wu Qing
Beijing SJ Environmental Protection and New Material Co., Ltd.
Berenato White & Stavish
Caldarola Glenn
Nguyen Huy-Tram
LandOfFree
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