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US3679762A
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US
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Selective hydrogenation of acetylenes
Assignee: Catalysts and Chemicals Inc
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Filing: 1970-06-08
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Granted: 1972-07-25
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Expires: 1990-06-08
Abstract
Abstract In view of the exothermic nature of acetylene hydrogenation reactions it is necessary to effect the hydrogenation of process gas streams containing larger quantities of acetylenes under other than usually practiced conditions. Under such circumstances isothermal operation has become the process of choice. Whereas a multiplicity of palladium catalysts have found their place in adiabatic operation, very few of these perform satisfactorily in isothermal reactors. We have found a palladium catalyst which outperforms these known catalysts.
Inventors
- 👤 Richard W La Hue
- 👤 Nolan A Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:06
CPC Classifications
B; B01; B01J; B01J35/00; B01J35/60; B01J23/00; B01J23/38; B01J23/40; B01J23/44; B01J23/70; B01J23/89; B01J23/892; C; C07; C07C; C07C7/00; C07C7/148; C07C7/163; C07C7/167; B01J35/61; B01J35/613; B01J35/615; B01J35/63; B01J35/633; B01J35/635; B01J35/64; B01J35/647; B01J35/651
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
15 words
The process of claim 1 wherein the stream contains 2 to 3 volume percent acetylene.
Claim 2
Dependent Claim
63 words
The process of claim 1 wherein the hydrogenation catalyst has 50 to 98 percent of its pores having pore diameters in the range of 29 to 350 Angstroms, wherein only 1 to about 30 percent of the pores have a pore diameter larger than 800 Angstroms, and wherein its surface area is in the range of 90 through 200 square meters per gram.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein the catalyst contains 30 percent kaolin.
Claim 4
Dependent Claim
12 words
The process of claim 1 wherein the catalyst is devoid of clay.
Claim 5
Dependent Claim
22 words
The process of claim 1 wherein the catalyst is impregnated with 0.002 to 0.5 percent palladium by weight based on the catalyst.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |