US4946815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid phosphoric acid catalyst
Assignee: Honeywell UOP LLC
•
Filing: 1988-12-23
•
Granted: 1990-08-07
•
Expires: 2008-12-23
Abstract
Abstract A solid phosphoric acid catalyst having a total X-ray intensity of at least 30 percent relative to alpha-alumina. The solid phosphoric acid catalyst is produced by crystallizing an amorphous mixture of an acid oxide of phosphorus and a siliceous material at a temperature of from 250 DEG to 450 DEG C. and in the presence of from 3 to 50 mole percent water vapor based upon the total vapor rate to the crystallizing means.
Inventors
- 👤 Tai-Hsiang Chao
- 👤 Fiona P. Wilcher
- 👤 Mark R. Ford
- 👤 Andrzej Z. Ringwelski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:01
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/14; B01J27/16; B01J29/00; B01J29/82; B01J29/84; B01J29/85; C; C07; C07C; C07C2/00; C07C2/02; C07C2/04; C07C2/06; C07C2/08; C07C2/14; C07C2/18; B01J2229/00; B01J2229/30; B01J2229/36; B01J27/182; C07C2527/00; C07C2527/14; C07C2527/16; C07C2527/167; C07C2527/173; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/584
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
109 words
A solid phosphoric acid catalyst having a total silicon phosphate X-ray intensity greater than 40 percent relative to alpha-alumina and comprising silicon pyrophosphate crystallites with at least 1.0 percent x-ray intensity and silicon orthophosphate crystallites with at least 30 percent x-ray intensity, both relative to alpha-alumina, with the desired phosphoric acid catalyst crystallinity produced by crystallizing an amorphous mixture of an acid oxide of phosphorus and a siliceous material in a crystallizing means where the crystallizing means is operated at a temperature of from 350° to 450° C., and at a steam concentration of from 10 to 50 mole percent based upon the total vapor in the crystallizing means.
Claim 2
Dependent Claim
109 words
A solid phosphoric acid catalyst having a total silicon phosphate X-ray intensity greater than 40 percent relative to alpha-alumina and comprising silicon pyrophosphate crystallites with at least 1.0 percent x-ray intensity and silicon orthophosphate crystallites with at least 30 percent x-ray intensity, both relative to alpha-alumina, with the desired phosphoric acid catalyst crystallinity produced by crystallizing an amorphous mixture of an acid oxide of phosphorus and a siliceous material in a crystallizing means where the crystallizing means is operated at a temperature of from 350° to 450° C., and at a steam concentration of from 10 to 50 mole percent based upon the total vapor in the crystallizing means.
Claim 3
Dependent Claim
44 words
The solid phosphoric acid catalyst of claim 1 further characterized in that the amorphous mixture of phosphorus oxide and a siliceous material is crystallized in the presence of from 10 to 25 mole percent steam based upon the total vapor in the crystallizing means.
Claim 4
Dependent Claim
30 words
The solid phosphoric acid catalyst of claim 1 further characterized in that the catalyst is crystallized for a total period of time ranging from 20 to 120 minutes or more.
Claim 5
Dependent Claim
120 words
A solid phosphoric acid catalyst having a total silicon phosphate X-ray intensity greater than 40 percent relative to alpha-alumina and comprising silicon pyrophosphate crystallites with at least 1.0 percent X-ray intensity and silocon orthophosphate crystallites with at least 30 percent X-ray intensity, both relative to alpha-alumina with the desired phosphoric acid catalyst crystallinity produced by crystallizing an amorphous mixture of an acid oxide of phosphorus and a siliceous material in a crystallizing means comprising a crystallization zone which operates at a temperature of from 350° to 450° C. and contains from 10 to 25 mole percent steam based upon the total vapor in the crystallizing zone and for a total time period ranging from 20 to 120 minutes or more.
Claim 6
Dependent Claim
120 words
A solid phosphoric acid catalyst having a total silicon phosphate X-ray intensity greater than 40 percent relative to alpha-alumina and comprising silicon pyrophosphate crystallites with at least 1.0 percent X-ray intensity and silocon orthophosphate crystallites with at least 30 percent X-ray intensity, both relative to alpha-alumina with the desired phosphoric acid catalyst crystallinity produced by crystallizing an amorphous mixture of an acid oxide of phosphorus and a siliceous material in a crystallizing means comprising a crystallization zone which operates at a temperature of from 350° to 450° C. and contains from 10 to 25 mole percent steam based upon the total vapor in the crystallizing zone and for a total time period ranging from 20 to 120 minutes or more.
Claim 7
Dependent Claim
38 words
The solid phosphoric acid catalyst of claim 4 further characterized in that the siliceous material component of the solid phosphoric acid catalyst is selected from the group consisting of kieselguhr clay, diatomaceous earth, and artificially prepared porous silica.
Claim 8
Dependent Claim
30 words
The solid phosphoric acid catalyst of claim 4 further characterized in that the weight ratio of phosphorus oxide to siliceous material of the amorphous mixture ranges from 1 to 10.
Claim 9
Dependent Claim
22 words
The solid phosphoric acid catalyst of claim 4 further characterized in that the catalyst is crystallized in a single zone crystallizing means.
Claim 10
Dependent Claim
21 words
The solid phosphoric acid catalyst of claim 4 further characterized in that the acid oxide of phosphorus is a polyphosphoric acid.
Claim 11
Independent Claim
107 words
A method of preparing a solid phosphoric acid catalyst having a total silicon phosphate X-ray intensity greater than 40 percent relative to alpha-alumina and comprising silicon pyrophosphate crystallites with at least 1.0 percent x-ray intensity and silicon orthophosphate crystallites with at least 30 percent x-ray intensity, both relative to alpha-alumina, the method comprising crystallizing an amorphous mixture of an acid oxide of phosphorus and a siliceous material in a crystallizing means comprising a crystallizing zone operated at a temperature of from 250° to 450° C. and at a steam rate of from 10 to 50 mole percent based upon the total vapor in the same crystallizing zone.
Claim 12
Independent Claim
107 words
A method of preparing a solid phosphoric acid catalyst having a total silicon phosphate X-ray intensity greater than 40 percent relative to alpha-alumina and comprising silicon pyrophosphate crystallites with at least 1.0 percent x-ray intensity and silicon orthophosphate crystallites with at least 30 percent x-ray intensity, both relative to alpha-alumina, the method comprising crystallizing an amorphous mixture of an acid oxide of phosphorus and a siliceous material in a crystallizing means comprising a crystallizing zone operated at a temperature of from 250° to 450° C. and at a steam rate of from 10 to 50 mole percent based upon the total vapor in the same crystallizing zone.
References Cited (Backward Citations)
US2116151A
Cited
US2275182A
Cited
US2650201A
Cited
DE1096891B
Cited
US3050472A
Cited
US3112350A
Cited
US3661801A
Cited
US3673111A
Cited
US3801704A
Cited
US4521638A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-08-06 | 1994-02-05 | 1994-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-06 | 1998-02-05 | 1998-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-06 | 2002-02-05 | 2002-08-07 | $7700.00 | Window Closed / Lapsed |