Patent US5997594A successfully refreshed from Google Patents.
US5997594A
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Steam reformer with internal hydrogen purification
Assignee: NORTHWEST POWER SYSTEMS A LLC LLC
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Filing: 1997-10-15
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Granted: 1999-12-07
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Expires: 2017-10-15
Abstract
Abstract A steam reformer with internal hydrogen purification includes internal bulk hydrogen purification, internal hydrogen polishing to remove trace levels of carbon monoxide and carbon dioxide, an integrated combustion method utilizing waste gas to heat the reformer, efficient integration of heat transfer, and a compact design. One steam reformer shown includes a concentric cylindrical architecture nesting an annular combustion region, an annular reforming region, an annular hydrogen transport region, and a cylindrical polishing region. Other reformers shown include modified combustion systems distributed within a reformation region, isolated vaporization chambers, combustion systems providing uniform temperature gradient, and plate membrane construction methods.
Inventors
- 👤 David J. Edlund
- 👤 William A. Pledger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:26
CPC Classifications
C; C01; C01B; C01B3/00; C01B3/50; C01B3/56; C01B3/58; C01B3/586; B; B01; B01D; B01D53/00; B01D53/22; B01D53/228; B01D53/229; B01D69/00; B01D69/10; B01D69/107; B01D69/1071; B01D71/00; B01D71/02; B01D71/022; B01D71/0221; B01D71/0223; B01D71/02231; B01D71/02232; B01J; B01J19/00; B01J19/24; B01J19/2475; B01J8/00; B01J8/008; B01J8/009; B01J8/02; B01J8/04; B01J8/0446; B01J8/0461; B01J8/0465; B01J8/0469; B01J8/0496; B01J8/06; B01J8/062; B01J8/067; C01B3/02; C01B3/32; C01B3/323; C01B3/326; C01B3/34; C01B3/38; C01B3/382; C01B3/501; C01B3/503; C01B3/505; C12; C12F; C12F5/00; G; G01; G01N; G01N1/00; G01N1/28; G01N1/34; B01D2257/00; B01D2257/10; B01D2257/108; B01D2323/00; B01D2323/12; B01J2208/00; B01J2208/00008; B01J2208/00017; B01J2208/00026; B01J2208/00035; B01J2208/00044; B01J2208/00053; B01J2208/00061; B01J2208/00106; B01J2208/00115; B01J2208/00141; B01J2208/00309; B01J2208/00389; B01J2208/00415; B01J2208/00477; B01J2208/00495; B01J2208/0053; B01J2208/00539; B01J2208/00548; C01B2203/00; C01B2203/02; C01B2203/0205; C01B2203/0227; C01B2203/0233; C01B2203/0283; C01B2203/04; C01B2203/0405; C01B2203/041; C01B2203/0435; C01B2203/0445; C01B2203/0465; C01B2203/047; C01B2203/0475; C01B2203/06; C01B2203/066; C01B2203/08; C01B2203/0805; C01B2203/0811; C01B2203/0822; C01B2203/0827; C01B2203/085; C01B2203/0866; C01B2203/10; C01B2203/1005; C01B2203/1011; C01B2203/1041; C01B2203/1047; C01B2203/1052; C01B2203/1058; C01B2203/1076; C01B2203/12; C01B2203/1205; C01B2203/1211; C01B2203/1217; C01B2203/1223; C01B2203/1235; C01B2203/1241; C01B2203/1247; C01B2203/1288; C01B2203/14; C01B2203/142; C01B2203/146; C01B2203/16; C01B2203/1604; C01B2203/1628; C01B2203/1633; C01B2203/80; C01B2203/82; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/32; Y02P; Y02P20/00; Y02P20/10; Y02P20/50; Y02P20/52
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
207 words
A steam reformer, comprising: a reformation chamber containing a reformation catalyst, wherein the reformation chamber is adapted to receive a reformation feedstock and produce a reformate stream including hydrogen therefrom; and a membrane module adapted to receive the reformate stream and divide the reformate stream into a byproduct stream and a hydrogen product stream, the membrane module comprising: a plurality of hydrogen permeable membranes, each having a reformate side and a permeate side, wherein the membranes are spaced-apart from each other and oriented with their permeate sides generally facing each other to define a harvesting conduit extending therebetween, and further wherein the hydrogen product stream is formed from the portion of the reformate stream that passes through the membranes to the harvesting conduit, with the remaining portion of the reformate stream which remains on the reformate side of the membranes forming the byproduct stream; a support within the harvesting conduit adapted to support the membranes, wherein the support includes a pair of generally opposed surfaces which are adapted to provide support to a respective one of the permeate sides of the membranes; and a product outlet port in fluid communication with the harvesting conduit and through which the hydrogen product stream is withdrawn from the membrane module.
Claim 2
Dependent Claim
207 words
A steam reformer, comprising: a reformation chamber containing a reformation catalyst, wherein the reformation chamber is adapted to receive a reformation feedstock and produce a reformate stream including hydrogen therefrom; and a membrane module adapted to receive the reformate stream and divide the reformate stream into a byproduct stream and a hydrogen product stream, the membrane module comprising: a plurality of hydrogen permeable membranes, each having a reformate side and a permeate side, wherein the membranes are spaced-apart from each other and oriented with their permeate sides generally facing each other to define a harvesting conduit extending therebetween, and further wherein the hydrogen product stream is formed from the portion of the reformate stream that passes through the membranes to the harvesting conduit, with the remaining portion of the reformate stream which remains on the reformate side of the membranes forming the byproduct stream; a support within the harvesting conduit adapted to support the membranes, wherein the support includes a pair of generally opposed surfaces which are adapted to provide support to a respective one of the permeate sides of the membranes; and a product outlet port in fluid communication with the harvesting conduit and through which the hydrogen product stream is withdrawn from the membrane module.
Claim 3
Dependent Claim
16 words
The reformer of claim 1, wherein the support engages but is not bonded to the membranes.
Claim 4
Dependent Claim
14 words
The reformer of claim 1, wherein the support is formed from a porous material.
Claim 5
Dependent Claim
26 words
The reformer of claim 1, wherein the support is adapted to permit flow of gas both parallel and transverse to the permeate sides of the membranes.
Claim 6
Dependent Claim
32 words
The reformer of claim 1, wherein the support defines a gas stream path through the harvesting conduit, with the stream path extending parallel and transverse to the permeate sides of the membranes.
Claim 7
Dependent Claim
10 words
The reformer of claim 1, wherein the support includes mesh.
Claim 8
Dependent Claim
29 words
The reformer of claim 6, wherein the support includes an inner mesh screen with outer mesh screens separating the inner mesh screen and the permeate sides of the membranes.
Claim 9
Dependent Claim
17 words
The reformer of claim 7, wherein the inner mesh screen is coarser than the outer mesh screens.
Claim 10
Dependent Claim
26 words
The reformer of claim 1, wherein the membranes define generally parallel, spaced-apart planes with the harvesting conduit extending therebetween and being at least substantially coextensive therewith.
Claim 11
Dependent Claim
25 words
The reformer of claim 1, wherein each membrane includes an edge region secured to a frame that extends beyond the edge region of the membrane.
Claim 12
Dependent Claim
17 words
The reformer of claim 10, wherein the frame is bonded to the edge region by ultrasonic welding.
Claim 13
Dependent Claim
46 words
The reformer of claim 10, wherein the reformer includes a plurality of gas transport conduits extending through the frames to selectively deliver the reformate stream to the reformate sides of the membranes, remove the product stream from the harvesting conduit, and to remove the byproduct stream.
Claim 14
Dependent Claim
26 words
The reformer of claim 12, wherein at least one of the conduits is adapted to deliver the byproduct stream to a combustion region of the reformer.
Claim 15
Dependent Claim
24 words
The reformer of claim 12, wherein at least one of the conduits is adapted to deliver the product stream to a polishing catalyst bed.
Claim 16
Dependent Claim
33 words
The reformer of claim 1, wherein the support and the membranes whose permeate sides are supported by the support comprise a membrane envelope, and further wherein the membrane module includes plural membrane envelopes.
Claim 17
Dependent Claim
91 words
The reformer of claim 15, wherein each membrane envelope includes an inlet port through which at least a portion of the reformate stream is delivered to the membrane envelope, a product outlet port through which the product stream is withdrawn from the harvesting conduit, and a byproduct port through which the byproduct stream is withdrawn from the membrane envelope, and further wherein the corresponding ports of the plurality of membrane envelopes are in fluid communication with each other to respectively form an inlet conduit, a product conduit and a byproduct conduit.
Claim 18
Dependent Claim
23 words
The reformer of claim 16, wherein the byproduct conduit is adapted to deliver the byproduct stream to a combustion region of the reformer.
Claim 19
Dependent Claim
21 words
The reformer of claim 16, wherein the product conduit is adapted to deliver the product stream to a polishing catalyst bed.
Claim 20
Dependent Claim
22 words
The reformer of claim 1, wherein each hydrogen permeable membrane is formed from at least one of palladium or a palladium alloy.
Claim 21
Dependent Claim
14 words
The reformer of claim 19, wherein each membrane contains less than 200 ppm carbon.
Claim 22
Dependent Claim
14 words
The reformer of claim 20, wherein each membrane contains less than 100 ppm carbon.
Claim 23
Dependent Claim
14 words
The reformer of claim 21, wherein each membrane contains less than 50 ppm carbon.
Claim 24
Dependent Claim
112 words
A hydrogen-selective membrane envelope, comprising: a hydrogen permeable membrane region having an inlet side and a permeate side; another hydrogen permeable membrane region having an inlet side and a permeate side, wherein the membrane regions are spaced-apart from each other with their permeate sides facing each other and defining a harvesting conduit extending therebetween; a support within the harvesting conduit and adapted to support the permeate sides of the membrane regions, wherein the support enables gas passing through the membrane regions to the harvesting conduit to travel transverse and parallel to the permeate sides of the membrane regions; and an outlet port through which gas may be harvested from the harvesting conduit.
Claim 25
Dependent Claim
112 words
A hydrogen-selective membrane envelope, comprising: a hydrogen permeable membrane region having an inlet side and a permeate side; another hydrogen permeable membrane region having an inlet side and a permeate side, wherein the membrane regions are spaced-apart from each other with their permeate sides facing each other and defining a harvesting conduit extending therebetween; a support within the harvesting conduit and adapted to support the permeate sides of the membrane regions, wherein the support enables gas passing through the membrane regions to the harvesting conduit to travel transverse and parallel to the permeate sides of the membrane regions; and an outlet port through which gas may be harvested from the harvesting conduit.
Claim 26
Dependent Claim
27 words
The membrane envelope of claim 23, wherein the envelope is in fluid communication with a steam reformer and adapted to receive a reformate stream containing hydrogen therefrom.
Claim 27
Dependent Claim
15 words
The membrane envelope of claim 24, wherein the envelope is coupled to the steam reformer.
Claim 28
Dependent Claim
18 words
The membrane envelope of claim 25, wherein the envelope is at least partially contained within the steam reformer.
Claim 29
Dependent Claim
29 words
The membrane envelope of claim 23, wherein the support engages the permeate sides of the membrane regions but is not bonded to the permeate sides of the membrane regions.
Claim 30
Dependent Claim
11 words
The membrane envelope of claim 23, wherein the support includes mesh.
Claim 31
Dependent Claim
31 words
The membrane envelope of claim 28, wherein the support includes an inner mesh screen and outer mesh screens separating the inner mesh screen and the permeate sides of the membrane regions.
Claim 32
Dependent Claim
18 words
The membrane envelope of claim 29, wherein the inner mesh screen is coarser than the outer mesh screens.
Claim 33
Dependent Claim
21 words
The membrane envelope of claim 23, wherein the membrane regions define generally parallel, spaced-apart surfaces with the harvesting conduit extending therebetween.
Claim 34
Dependent Claim
21 words
The membrane envelope of claim 23, wherein each membrane region includes an outer edge region to which a frame is bonded.
Claim 35
Dependent Claim
27 words
The membrane envelope of claim 32, wherein each frame is bonded to the outer edge region of a corresponding one of the membrane regions by ultrasonic welding.
Claim 36
Dependent Claim
23 words
The membrane envelope of claim 23, wherein each of the membranes is formed from at least one of palladium and a palladium alloy.
Claim 37
Dependent Claim
17 words
The membrane envelope of claim 24, wherein each of the membranes contains less than 200 ppm carbon.
Claim 38
Dependent Claim
17 words
The membrane envelope of claim 35, wherein each of the membranes contains less than 100 ppm carbon.
Claim 39
Dependent Claim
17 words
The membrane envelope of claim 36, wherein each of the membranes contains less than 50 ppm carbon.
References Cited (Backward Citations)
US3849076A
Cited
US4132668A
Cited
US4329157A
Cited
US4197152A
Cited
US4650814A
Cited
US4713234A
Cited
US4654063A
Cited
US4684581A
Cited
US4810485A
Cited
US5449848A
Cited
US5354547A
Cited
US5645626A
Cited
US5498278A
Cited
US5393325A
Cited
US5814112A
Cited
US5509942A
Cited
US5326550A
Cited
US5639431A
Cited
US5612012A
Cited
US5658681A
Cited
US5525322A
Cited
US5705916A
Cited
US5734092A
Cited
US5637259A
Cited
US5782960A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-12-06 | 2003-06-07 | 2003-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-12-06 | 2007-06-07 | 2007-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-12-06 | 2011-06-07 | 2011-12-07 | $7700.00 | Window Closed / Lapsed |