Enhanced hydrogen recovery from effluent gas streams
Patent 4553981 Issued on November 19, 1985. Estimated Expiration Date: 
February 7, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 7, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3430418 3598527 Selective adsorption process Catalytic steam reforming of hydrocarbons Patent #: 4337170 InventorApplicationNo. 06/577802 filed on 02/07/1984US Classes:48/62R, Cupola252/374, Nitrogen and hydrogen containing252/375, Nitrogen from air or elementary nitrogen only and hydrogen from compounds252/376, Hydrogen from hydrocarbons422/234, Including external recycle loop422/235, And means heating or cooling loop or reaction mass located therein423/359, From elemental hydrogen and nitrogen423/648.1, Elemental hydrogen423/650, By decomposing hydrocarbon423/652, Including decomposing water423/655, By reacting water with carbon monoxide423/658.2, By direct decomposition of binary compound; e.g., chemical storage, etc.423/658.3, By reaction of impurities in a stream containing elemental hydrogen48/197R, PROCESSES48/210, Coal48/214A, Catalytic processes48/215, Air48/77, Coal48/94, Oil and steam injected48/95AirExaminersPrimary: Doll, JohnAssistant: Langel, Wayne A. Attorney, Agent or FirmInternational ClassesC01B 3/50 (20060101)C01B 3/12 (20060101) C01B 3/00 (20060101) AbstractEffluent gas streams for steam reforming, partial oxidation or coal gasification operations are advantageously treated in shift conversion, scrubbing and pressure swing adsorption units for recovery of a purified, hydrogen-containing product gas stream. By recycling a portion of the waste gas removed from the pressure swing adsorption system to the shift conversion unit and/or to the effluent gas generation operation, enhanced product recovery is achieved without the necessity for employing low temperature shift or for achieving essentially complete removal of the carbon dioxide content of the gas being treated prior to its passage to said pressure swing adsorption system.Other References
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