Chemistry of inorganic compounds – Hydrogen or compound thereof – Elemental hydrogen
Reexamination Certificate
2008-06-10
2008-06-10
Langel, Wayne A. (Department: 1793)
Chemistry of inorganic compounds
Hydrogen or compound thereof
Elemental hydrogen
C423S438000, C423S651000, C423S652000
Reexamination Certificate
active
07384621
ABSTRACT:
Methods for converting hydrocarbon fuels to hydrogen-rich reformate that incorporate a carbon dioxide fixing mechanism into the initial hydrocarbon conversion process. The mechanism utilizes a carbon dioxide fixing material to remove carbon dioxide from the reformate product stream. The removal of carbon dioxide from the product stream shifts the reforming reaction equilibrium toward higher hydrocarbon conversion with only small amounts of carbon oxides produced. Repeated absorption/desorption of carbon dioxide by the fixing materials tends to decrease the fixing capacity of the materials. Hydration of the carbon dioxide fixing materials between one or more cycles serves to sustain their fixing capacity and to enhance the efficiencies of the reforming and shift reactions occurring in the catalyst bed. Hydration can occur during reactor start-up or shut down, periodically over a number of cycles, and/or upon a monitored change in the reformate composition.
REFERENCES:
patent: 3108857 (1963-10-01), Gorin et al.
patent: 3188179 (1965-06-01), Gorin
patent: 3627478 (1971-12-01), Tepper et al.
patent: 5827496 (1998-10-01), Lyon
patent: 6007699 (1999-12-01), Cole
patent: 6103143 (2000-08-01), Sircar et al.
patent: 6660680 (2003-12-01), Hampden-Smith et al.
patent: 6682838 (2004-01-01), Stevens
patent: 6685762 (2004-02-01), Brewster et al.
patent: 6878362 (2005-04-01), Kumar et al.
patent: 2002/0085967 (2002-07-01), Yokota
patent: 2002/0110503 (2002-08-01), Gittleman et al.
patent: 2002/0155329 (2002-10-01), Stevens
patent: 2003/0150163 (2003-08-01), Murata et al.
patent: 1187668 (2002-03-01), None
patent: 2000-273472 (2000-10-01), None
patent: 2002-208425 (2002-07-01), None
Balasubramanian, et al., “Hydrogen from Methane in a Single-Step Process,”Chemical Engineering Science, vol. 54, No. , pp. 3543-3552 (1999), no month.
Ding et al., Adsorption-enhanced steam-methane reforming,Chemical Engineering Science, 55 (2000), Issue 18, pp. 3929-2940, no month.
Xiu et al., New generalized strategy for improving sorption-enhanced reaction process,Chemical Engineering Science, 58 (2003), Issue 15, pp. 3425-3437, no month.
Waldron et al., Production of Hydrogen by cyclic sorption enhanced reaction process,A.I.Ch.E. Journal, vol. 47, No. 6, pp. 1477-1479 (Jun. 2001).
Alpay et al., “Combined Reaction and Separation in Pressure Swing Processes,”Chemical Engineering Science, vol. 49, No. 24B, pp. 5845-5864, no date.
Berty et al., “Beat the equilibrium,”Chemtech, Oct. 1990, pp. 624-629.
Carvill et al., “Sorption-enhanced reaction process,”AlChE Journal, Oct. 1996, vol. 42, No. 10, pp. 2765-2772.
Han et al., “Simultaneous shift reaction and carbon dioxide separation for the direct production of hydrogen,”Chemical Engineering Science, vol. 49, No. 24B, pp. 5875-5883 (1995), no date.
Hufton et al., “Sorption-enhanced reaction process for hydrogen production,”AlChE Journal, Feb. 1999, vol. 45, No. 2, pp. 248-256.
Kuramoto et al., “Repetitive carbonation-calcination reactions of Ca-based sorbents for efficient CO2sorption at elevated temperatures,”Ind. Eng. Chem. Res., 2003, vol. 42, pp. 975-981, no month.
Lin et al., “Hydrogen production from hydrocarbon by integration of water-carbon reaction and carbon dioxide removal (HyPr-RING Method),”Energy and Fuels, 2001, vol. 15, pp. 339-343, no month.
Rizeq et al., “Fuel-flexible gasification-combustion technology for production of H2and sequestration-ready CO2,” Annual Technical Progress Report 2002, Oct. 2002, DOE Award No. DE-FC26-00FT40974, General Electric and Environmental Research Corporation.
Silaban et al., “High temperature capture of carbon dioxide: characteristics of the reversible reaction between CaO(s) and CO2(g),”Chem. Eng. Comm., 1995, vol. 137, pp. 177-190, no month.
Cao Julie M.
Stevens James F.
Vu Thomas M.
Langel Wayne A.
Patangia Melissa
Texaco Inc.
Turner Frank C.
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