Chemistry of inorganic compounds – Hydrogen or compound thereof – Elemental hydrogen
Patent
1999-01-06
2000-12-26
Langel, Wayne
Chemistry of inorganic compounds
Hydrogen or compound thereof
Elemental hydrogen
95 56, 422177, 423653, C01B 326, B01D 5346
Patent
active
061654388
ABSTRACT:
Apparatus and method for simultaneous recovery of hydrogen from water and from hydrocarbon feed material. The feed material is caused to flow over a heated catalyst which fosters the water-gas shift reaction (H.sub.2 O+COH.sub.2 +CO.sub.2) and the methane steam reforming reaction (CH.sub.4 +H.sub.2 O3 H.sub.2 +CO). Both of these reactions proceed only to partial completion. However, by use of a Pd/Ag membrane which is exclusively permeable to hydrogen isotopes in the vicinity of the above reactions and by maintaining a vacuum on the permeate side of the membrane, product hydrogen isotopes are removed and the reactions are caused to proceed further toward completion. A two-stage palladium membrane reactor was tested with a feed composition of 28% CQ.sub.4, 35% Q.sub.2 O (where Q=H, D, or T), and 31% Ar in 31 hours of continuous operation during which 4.5 g of tritium were processed. Decontamination factors were found to increase with decreasing inlet rate. The first stage was observed to have a decontamination factor of approximately 200, while the second stage had a decontamination factor of 2.9.times.10.sup.6. The overall decontamination factor was 5.8.times.10.sup.8. When a Pt/.alpha.-Al.sub.2 O.sub.3 catalyst is employed, decoking could be performed without catalyst degradation. However, by adjusting the carbon to oxygen ratio of the feed material with the addition of oxygen, coking could be altogether avoided.
REFERENCES:
patent: 2773561 (1956-12-01), Hunter et al.
patent: 2958391 (1960-11-01), DeRosset
patent: 3278268 (1966-10-01), Pfefferle, Jr.
patent: 3439474 (1969-04-01), McKinley et al.
patent: 3450500 (1969-06-01), Setzer et al.
patent: 4810485 (1989-03-01), Marianowski et al.
patent: 4981676 (1991-01-01), Minet et al.
patent: 5229102 (1993-07-01), Minet et al.
patent: 5525322 (1996-06-01), Willms
Birdsell Stephen A.
Willms R. Scott
Freund Samuel M.
Langel Wayne
The Regents of the University of California
LandOfFree
Apparatus and method for simultaneous recovery of hydrogen from does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus and method for simultaneous recovery of hydrogen from , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for simultaneous recovery of hydrogen from will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-991511