Patent US4902307A successfully refreshed from Google Patents.
US4902307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthesis of SiO2 membrane on porous support and method of use of same
Assignee: California Institute of Technology
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Filing: 1988-11-18
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Granted: 1990-02-20
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Expires: 2008-11-18
Abstract
Abstract A method for lining a porous tube (5) with a film (11) of SiO 2 is described. The treated tube may be used to separate hydrogen from reaction mixtures such as those resulting from the water-gas shift reaction or the catalytic decomposition of hydrogen sulfide.
Inventors
- 👤 George R. Gavalas
- 👤 Constantin E. Megiris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:29
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0039; B01D67/0069; B01D53/00; B01D53/22; B01D53/228; B01D71/00; B01D71/02; B01D71/024; B01D71/027; B01J; B01J15/00; B01J15/005; C; C01; C01B; C01B17/00; C01B17/02; C01B17/04; C01B17/0495; C01B3/00; C01B3/02; C01B3/06; C01B3/12; C01B3/50; C01B3/501; C01B3/503; B01D2325/00; B01D2325/04; B01D2325/28; C01B2203/00; C01B2203/04; C01B2203/0405; C01B2203/041; C01B2203/0465; C01B2203/0475; C01B2203/0485
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
71 words
A method of separating hydrogen from a gaseous mixture comprising passing the mixture into a membrane comprising a porous support tube having a non-porous film of amorphous SiO 2 in the pores of said tube, said film having been formed by flowing a first reactant inside said support tube and a second reactant outside said support tube, and causing said reactants to diffuse in opposite directions and meet within said pores.
Claim 2
Independent Claim
71 words
A method of separating hydrogen from a gaseous mixture comprising passing the mixture into a membrane comprising a porous support tube having a non-porous film of amorphous SiO 2 in the pores of said tube, said film having been formed by flowing a first reactant inside said support tube and a second reactant outside said support tube, and causing said reactants to diffuse in opposite directions and meet within said pores.
Claim 3
Dependent Claim
21 words
The method of claim 1 wherein the gaseous mixture is produced in said tube by means of the water-gas shift reaction.
Claim 4
Dependent Claim
20 words
The method of claim 1 wherein the gaseous mixture is produced in said tube by catalytic dissociation of hydrogen sulfide.
Claim 5
Dependent Claim
57 words
A membrane comprising a porous support tube having a non-porous film of amorphous SiO 2 in the pores of said tube, said film having been formed by flowing a first reactant inside said support tube and a second reactant outside said support tube, and causing said reactants to diffuse in opposite directions and meet within said pores.
Claim 6
Dependent Claim
57 words
A membrane comprising a porous support tube having a non-porous film of amorphous SiO 2 in the pores of said tube, said film having been formed by flowing a first reactant inside said support tube and a second reactant outside said support tube, and causing said reactants to diffuse in opposite directions and meet within said pores.
Claim 7
Dependent Claim
21 words
The membrane of claim 4 herein the SiO 2 film has a thickness from about 0.02 μm to about 5 μm.
Claim 8
Dependent Claim
21 words
The membrane of claim 5 herein the SiO 2 film has a thickness from about 0.05 μm to about 2 μm.
Claim 9
Dependent Claim
27 words
The membrane of claim 4 wherein the support tube is made of Vycor glass having an average pore diameter of about 35 Å to about 45 Å.
Claim 10
Dependent Claim
26 words
The membrane of claim 4 wherein the support tube is made of alumina having an average pore diameter of about 50 Å to about 1,000 Å.
Claim 11
Independent Claim
85 words
A method for depositing a thin film of SiO 2 within the porous walls of a support tube comprising passing a first fluid reactant into the support tube and into pores in the support tube, and a second fluid reactant into an annular space on the outside of the support tube and into the pores of said support tube to contact and react with the first reactant, the first reactant and the second reactant being selected to form said thin film of SiO 2 .
Claim 12
Independent Claim
85 words
A method for depositing a thin film of SiO 2 within the porous walls of a support tube comprising passing a first fluid reactant into the support tube and into pores in the support tube, and a second fluid reactant into an annular space on the outside of the support tube and into the pores of said support tube to contact and react with the first reactant, the first reactant and the second reactant being selected to form said thin film of SiO 2 .
Claim 13
Dependent Claim
28 words
The method of claim 9 wherein the two reactants are SiH 4 and O 2 , producing said thin film and said thin film is non-porous and amorphous.
Claim 14
Dependent Claim
18 words
The method of claim 10 wherein the film thickness ranges from about 0.02 μm to about 5 μm.
Claim 15
Dependent Claim
18 words
The method of claim 11 wherein the film thickness is from about 0.05 μm to about 2 μm.
Claim 16
Dependent Claim
27 words
The method of claim 9 wherein the support tube is made of Vycor glass having an average pore diameter of about 35 Å to about 45 Å.
Claim 17
Dependent Claim
26 words
The method of claim 9 wherein the support tube is made of alumina having an average pore diameter of about 50 Å to about 1,000 Å.
References Cited (Backward Citations)
US1685759A
Cited
US2892508A
Cited
US3019853A
Cited
US3100868A
Cited
US3135591A
Cited
US3338681A
Cited
US3450500A
Cited
US3717525A
Cited
US3567666A
Cited
US3957559A
Cited
JPS55119420A
Cited
US4313013A
Cited
JPS57150423A
Cited
JPS5955315A
Cited
JPS5955314A
Cited
JPS612548A
Cited
US4599157A
Cited
DE3421833A1
Cited
US4806189A
Cited
US4670033A
Cited
US4627859A
Cited
JPS61238303A
Cited
GB2190397A
Cited
JPS6349220A
Cited
US4810485A
Cited
JPS6388019A
Cited
US4828588A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-19 | 1993-08-21 | 1994-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-19 | 1997-08-21 | 1998-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-19 | 2001-08-21 | 2002-02-20 | $7700.00 | Window Closed / Lapsed |