US4376066A
Expired / Lapsed
US
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Method for preparing a catalyst for an isotopic exchange column
Assignee: Belgian Nuclear Research Centre
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Filing: 1981-07-21
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Granted: 1983-03-08
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Expires: 2001-07-21
Abstract
Abstract Carrier particles whereon a metal from the group VIII of the periodic element system is fixed are dry-mixed with particles from hydrophobic material which is simultaneously a binder and may thus bind the carrier particles together. The thus obtained mixture is subjected to an agglomeration step. The resulting agglomerates are broken. The broken agglomerates are screened and that fraction with a grain size smaller than 1 mm is pressed into a cake at a pressure of 25 kg/cm2 at the most. The press cake is rolled and catalyst particles are cut from the rolled cake. The catalyst particles are mixed with hydrophilic particles. The thus obtained mixture is used in an isotopic exchange column for separating tritium from aqueous effluents. In this column the effluents are lead in counter-current to gaseous hydrogen.
Inventors
- 👤 Aime E. Bruggeman
- 👤 Roger F. R. Leysen
- 👤 Philippe Vermeiren
- 👤 Marcel Monsecour
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:34
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/0009; B01D; B01D59/00; B01D59/28; B01D59/32; C; C01; C01B; C01B4/00; G; G21; G21F; G21F9/00; G21F9/04; G21F9/06; G21F9/12
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
91 words
A method for preparing a hydrophobic catalyst for an isotopic exchange column comprising the steps of dry-mixing 4 to 85 w % carrier particles on which 0.5 to 10 w % metal from group VIII of the periodic element system is fixed with 15 to 96 w % particles from hydrophobic material which is simultaneously a binder and may thus bind the carrier particles together, subjecting the thus obtained mixture to an agglomeration step, breaking the agglomerates, pressing the broken agglomerates into a cake, and cutting catalyst particles from said cake.
Claim 2
Independent Claim
91 words
A method for preparing a hydrophobic catalyst for an isotopic exchange column comprising the steps of dry-mixing 4 to 85 w % carrier particles on which 0.5 to 10 w % metal from group VIII of the periodic element system is fixed with 15 to 96 w % particles from hydrophobic material which is simultaneously a binder and may thus bind the carrier particles together, subjecting the thus obtained mixture to an agglomeration step, breaking the agglomerates, pressing the broken agglomerates into a cake, and cutting catalyst particles from said cake.
Claim 3
Independent Claim
111 words
A method for preparing a hydrophobic catalyst for an isotopic exchange column comprising the steps of dry-mixing 4 to 85 w % carrier particles on which 0.5 to 10 w % metal from group VIII of the periodic element system is fixed with 15 to 96 w % particles from hydrophobic material which is simultaneously a binder and may thus bind the carrier particles together, subjecting the thus obtained mixture to an agglomeration step, breaking the agglomerates, screening the broken agglomerates and maintaining as the usable fraction that portion with a grain size smaller than 1 mm, pressing that usable fraction into a cake, and cutting catalyst particles from said cake.
Claim 4
Independent Claim
111 words
A method for preparing a hydrophobic catalyst for an isotopic exchange column comprising the steps of dry-mixing 4 to 85 w % carrier particles on which 0.5 to 10 w % metal from group VIII of the periodic element system is fixed with 15 to 96 w % particles from hydrophobic material which is simultaneously a binder and may thus bind the carrier particles together, subjecting the thus obtained mixture to an agglomeration step, breaking the agglomerates, screening the broken agglomerates and maintaining as the usable fraction that portion with a grain size smaller than 1 mm, pressing that usable fraction into a cake, and cutting catalyst particles from said cake.
Claim 5
Dependent Claim
25 words
The method of claim 1, in which the broken agglomerates are pressed into a cake at a pressure of 25 kg/cm 2 at the most.
Claim 6
Dependent Claim
19 words
The method of claim 1, in which the press cake is rolled after the pressing and before the cutting.
Claim 7
Dependent Claim
17 words
The method of claim 1, in which the press cake is rolled to half the thickness thereof.
Claim 8
Dependent Claim
30 words
The method of claim 1, in which after the pressing and before the cutting the press cake is subjected to succeeding rolling steps along directions at 90° to one another.
Claim 9
Dependent Claim
35 words
The method of claim 1, in which after the pressing and before the cutting the press cake is subjected to succeeding rolling steps which each cause a thickness reduction in the range of 0.2 mm.
Claim 10
Dependent Claim
15 words
The method of claim 1, in which the catalyst particles are mixed with hydrophilic particles.
Claim 11
Dependent Claim
23 words
The method of claim 8, in which hydrophilic particles are added to the catalyst particles with an amount ratio of 2 to 1.
Claim 12
Dependent Claim
29 words
The method of claim 9, in which the hydrophilic particles are chosen among the following elements: glass beads, small springs from stainless metal and small nettings from stainless metal.
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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) | 1986-03-07 | 1986-09-06 | 1987-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-07 | 1990-09-06 | 1991-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-07 | 1994-09-06 | 1995-03-08 | $7700.00 | Window Closed / Lapsed |