Refrigeration – Cryogenic treatment of gas or gas mixture – Liquefaction
Reexamination Certificate
2007-11-19
2009-08-04
Caldarola, Glenn (Department: 1797)
Refrigeration
Cryogenic treatment of gas or gas mixture
Liquefaction
C062S091000, C062S091000, C062S091000, C062S612000, C208S306000, C208S308000, C208S340000, C208S351000, C208S352000, C208S353000, C208S354000, C208S361000, C055S423000, C055S423000, C055S423000, C055S423000
Reexamination Certificate
active
07568363
ABSTRACT:
A process for treating a crude containing natural gas comprising supplying the crude to a stabilization unit to obtain a gaseous stream and crude oil; supplying a compressed, gaseous stream at a low temperature to the bottom of a first column; partly condensing the first gaseous overhead stream, returning the liquid phase to the first column and supplying the methane-rich stream to a liquefaction plant; supplying an expanded bottom stream at a low temperature to the top of a second column; removing from the top of the second column a second gaseous overhead stream, and removing from the bottom of the second column a liquid bottom stream; vaporizing part of the bottom stream and introducing the vapor into the bottom of the second column; and introducing the remainder of the bottom stream into a crude oil stream at an appropriate point in or upstream of the stabilization unit, wherein the amount of heat removed from the first gaseous overhead stream is so adjusted that the concentration of C5+in the first gaseous overhead stream is below a predetermined value, and wherein the fraction of the liquid bottom stream from the second column that is vaporized is so selected that the concentration of C2−in the liquid bottom stream is below a predetermined level.
REFERENCES:
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patent: 5030339 (1991-07-01), Czarnecki
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Kirk-Othmer Encyclopedia of Chemical Technology,d.3, vol. 7,Copper Alloys to Distillation, US, New-York, 1978, p. 860.
Perry's Chemical Engineer's Handbook, Ed. 6, US, New-York, 1984, p. 22-115/22-117.
International Search Report dated Dec. 16, 2002.
Caldarola Glenn
Shell Oil Company
Singh Prem C.
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