Chemistry of inorganic compounds – Hydrogen or compound thereof – Elemental hydrogen
Reexamination Certificate
2006-05-09
2006-05-09
Hendrickson, Stuart L. (Department: 1754)
Chemistry of inorganic compounds
Hydrogen or compound thereof
Elemental hydrogen
C423S650000, C423S651000, C423S652000, C423S655000, C585S324000, C585S330000, C585S654000, C585S655000, C585S658000, C585S809000
Reexamination Certificate
active
07041271
ABSTRACT:
A method is disclosed a method for recovering olefins and for producing hydrogen from a refinery off-gas stream in which such stream is conventionally pretreated and separated to obtain a light ends stream that contains nitrogen, hydrogen and carbon monoxide and a heavy ends stream that contains the olefins. The light ends stream is subjected to reforming and a water gas shift reactions after addition of a natural gas stream. The addition of the natural gas increases the hydrogen recovery from the light ends and also stabilizes the hydrocarbon content in the stream to be subjected to the reforming and water gas shift reactions. The heavy ends can be further treated to recover olefins such as ethylene and propylene. The rate of natural gas addition is controlled so that the concentration of the nitrogen in a stream exiting the water gas shift reactor is less than about 5 percent by volume so that hydrogen separation from such stream becomes practical.
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Drnevich Raymond Francis
Herzog Jeffrey O.
Hendrickson Stuart L.
Praxair Technology Inc.
Rosenblum David M.
Vanoy Timothy C.
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