US3673111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the manufacture of solid phosphoric acid catalyst
Assignee: Universal Oil Products Co
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Filing: 1970-07-13
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Granted: 1972-06-27
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Expires: 1990-07-13
Abstract
Abstract A process for the manufacture of a solid phosphoric acid catalyst. A siliceous adsorbent is admixed with a polyphosphoric acid. The mixture is heated at an elevated temperature and thereafter extruded. High activity - high strength extrudate particles are produced by drying the extrudate first in a steam atmosphere and then in a dry air atmosphere.
Inventors
- 👤 Edward Hovarth
- 👤 Gary Youngman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:05
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/14; B01J27/16; C; C07; C07C; C07C2/00; C07C2/02; C07C2/04; C07C2/06; C07C2/08; C07C2/14; C07C2/18; C07C2527/00; C07C2527/14; C07C2527/16; C07C2527/167; C07C2527/173
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
18 words
The process of claim 1 further characterized in that said oxygen acid of phosphorus is a polyphosphoric acid.
Claim 2
Dependent Claim
24 words
The process of claim 1 further characterized in that said mixture is heated at a temperature of from about 250* to about 450* F.
Claim 3
Dependent Claim
65 words
The process of claim 1 further characterized in that said extrudate particles are dried in a steam atmosphere for a period of at least about 0.5 hours at a temperature of from about 650* to about 750* F. and thereafter in a dry air atmosphere for a period of at least about 0.5 hours at a temperature of from about 700* to about 800* F.
Claim 4
Dependent Claim
53 words
The process of claim 1 further characterized in that said extrudate particles are dried in said steam atmosphere at said temperature for a period of from about 0.5 to about 1.5 hours and thereafter in said dry air atmosphere at said temperature for a period of from about 0.5 to about 1.5 hours.
Claim 5
Dependent Claim
23 words
The process of claim 1 further characterized in that said steam atmosphere comprises from about 20 to about 35 wt. % water vapor.
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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |