Patent US4888033A successfully refreshed from Google Patents.
US4888033A
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Method of manufacturing permeable mineral membranes
Assignee: Commissariat à l'Énergie Atomique et Aux Énergies Alternatives
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Filing: 1980-02-08
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Granted: 1989-12-19
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Expires: 2000-02-08
Abstract
Abstract The invention relates to a method of manufacturing permeable mineral membranes. The method of the invention is characterized in that a thin layer of gel of peptised hydroxide of at least aluminum is deposited on a permeable perous substrate and the resulting membrane is dried and fired at a temperature between 500 DEG and 1100 DEG C. The resulting membranes can be used for isotopic separation of gases or for filtration and ultrafiltration.
Inventors
- 👤 Jean Charpin
- 👤 Andre Grangeon
- 👤 Francis Pejot
- 👤 Pierre Plurien
- 👤 Bernard Rasneur
- 👤 Serge Richard
- 👤 Rene Veyre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:42
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0039; B01D67/0048; B01D59/00; B01D59/10; B01D59/12; B01D69/00; B01D69/10; B01D69/108; B01D71/00; B01D71/02; B01D71/024; B01D71/025; C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/50; C04B41/5025; C04B41/5031; C04B41/80; C04B41/81; C04B41/85; C04B41/87; B01D2323/00; B01D2323/06; B01D2323/08; B01D2325/00; B01D2325/02; B01D2325/0283; B01D2325/02834; B01D2325/24; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12153; Y10T428/249921; Y10T428/249953; Y10T428/249955; Y10T428/249956; Y10T428/249957; Y10T428/249967; Y10T428/24997; Y10T428/249981; Y10T428/249987; Y10T428/249988; Y10T428/249989; Y10T428/24999
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
84 words
In a method of manufacturing a porous, permeable mineral membrane having a mean pore radius in the range of less than 200 Å and a permeability to nitrogen of 200 to 3000·10 -7 mol/cm Hg/cm 2 /min, the steps of depositing a voidless thin layer of a sol of aluminium hydroxide by slip painting without compacting on a permeable porous substrate and drying and firing the resulting membrane at a temperature between 500° and 1100° C. selected to obtain the desired mean pore radius.
Claim 2
Dependent Claim
84 words
In a method of manufacturing a porous, permeable mineral membrane having a mean pore radius in the range of less than 200 Å and a permeability to nitrogen of 200 to 3000·10 -7 mol/cm Hg/cm 2 /min, the steps of depositing a voidless thin layer of a sol of aluminium hydroxide by slip painting without compacting on a permeable porous substrate and drying and firing the resulting membrane at a temperature between 500° and 1100° C. selected to obtain the desired mean pore radius.
Claim 3
Dependent Claim
46 words
In a method according to claim 1, the aluminum hydroxide sol being prepared by hydrolysis of an aluminum alcoholate followed by peptization of the thus-formed hydrated aluminum oxide in the presence of a strong acid selected from the group consisting of hydrochloric acid and perchloric acid.
Claim 4
Dependent Claim
36 words
A method according to claim 1, the substrate comprising a support having pore radii from 4 to 20 microns, the support being covered with a thin layer having a pore radius of 0.05 to 2 microns.
Claim 5
Dependent Claim
13 words
A method according to claim 3, the porous substrate being a ceramic material.
Claim 6
Dependent Claim
12 words
A method according to claim 3, the porous substrate being a alumina.
Claim 7
Dependent Claim
11 words
A method according to claim 3, the porous substrate being nickel.
Claim 8
Dependent Claim
23 words
A porous, permeable mineral membrane having a mean pore radius lower than 60 Å as obtained by he method according to claim 1.
Claim 9
Dependent Claim
96 words
In a method of manufacturing a porous, permeable membrane having a mean pore radius in the range of less than 200 Åand a permeability to nitrogen of 200 to 3000 10 -7 mol/cm Hg/cm 2 /min, the steps of depositing a voidless thin layer of a sol of mixed hydroxide of aluminum and another metal capable of forming an aluminum spinel after pyrolysis by slip painting without compacting, on a permeable porous substrate and drying and firing the resulting membrane at a temperature between 500° and 1100° C. selected to obtain the desired mean pore radius.
Claim 10
Dependent Claim
96 words
In a method of manufacturing a porous, permeable membrane having a mean pore radius in the range of less than 200 Åand a permeability to nitrogen of 200 to 3000 10 -7 mol/cm Hg/cm 2 /min, the steps of depositing a voidless thin layer of a sol of mixed hydroxide of aluminum and another metal capable of forming an aluminum spinel after pyrolysis by slip painting without compacting, on a permeable porous substrate and drying and firing the resulting membrane at a temperature between 500° and 1100° C. selected to obtain the desired mean pore radius.
Claim 11
Dependent Claim
17 words
A method according to claim 8, the sol being a sol of mixed magnesium and aluminum hydroxide.
Claim 12
Dependent Claim
65 words
A method according to claim 8, the sol of mixed aluminum hydroxide being prepared by hydrolyzing an aluminum alcoholate, adding to the resulting solution a salt of a metal selected from the group consisting of magnesium, cobalt, copper, iron, manganese and nickel, and peptising the resulting solution in the presence of a strong acid selected from the group consisting of hydrochloric acid and perchloric acid.
Claim 13
Dependent Claim
61 words
A method according to claim 8, the sol of mixed aluminum hydroxide being prepared by hydrolysis of an aluminum alcoholate, peptising the resulting solution in the presence of a strong acid selected from the group consisting of hydrochloric and perchloric acid, and adding a salt of a metal selected from the group consisting of magnesium, cobalt, copper, iron, manganese and nickel.
Claim 14
Dependent Claim
12 words
A method according to claim 10, the magnesium salt being magnesium acetate.
Claim 15
Dependent Claim
12 words
A method according to claim 10, the magnesium salt being magnesium perchlorate.
Claim 16
Dependent Claim
12 words
A method according to claim 11, the magnesium salt being magnesium acetate.
Claim 17
Dependent Claim
12 words
A method according to claim 11, the magnesium salt being magnesium perchlorate.
Claim 18
Dependent Claim
37 words
A method according to claim 8, the subsrate comprises a support having a pore radius of 4 to 20 microns, the support being covered with a thin layer having a pore radius of 0.05 to 2 microns.
Claim 19
Dependent Claim
13 words
A method according to claim 16, the porous substrate being a ceramic material.
Claim 20
Dependent Claim
13 words
A method according to claim 16, the porous substrate being of a alumina.
Claim 21
Dependent Claim
11 words
A method according to claim 16, the porous substrate being nickel.
Claim 22
Dependent Claim
23 words
A porous, permeable mineral membrane having a mean pore radius lower than 60 Å as obtained by the method according to claim 8.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-12-18 | 1993-06-19 | 1993-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-18 | 1997-06-19 | 1997-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-18 | 2001-06-19 | 2001-12-19 | $7700.00 | Window Closed / Lapsed |