US3972835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid cracking catalyst based on silica sol matrix
Assignee: WR Grace and Co Conn
•
Filing: 1974-04-23
•
Granted: 1976-08-03
•
Expires: 1994-04-23
Abstract
Abstract A process for preparing a hydrocarbon cracking catalyst is disclosed. The process consists of preparing a silica sol by passing sodium silicate through an ion exchange resin column to form a silica sol containing about 5% silica. Clay and zeolitic components are added and the product is spray dried. This process is advantageous in that it produces a more dense and hence more attrition resistant catalyst.
Inventors
- 👤 Gordon H. Hoffman
- 👤 Richard J. Nozemack
- 👤 Curtis Homer Elliott, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:52
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/08; C; C10; C10G; C10G11/00; C10G11/02; C10G11/04; C10G11/05
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
101 words
A process for preparing a cracking catalyst having high activity and high density which comprises: a. preparing a silica sol having a silica content of about 1 to 8 weight percent which is essentially free of sodium and passing said solution through an ion exchange resin bed, b. adding clay in an amount equal to 0-70 weight percent of the finished catalyst to said sol, c. preparing a water slurry of a faujasitic zeolitic aluminosilicate and adjusting the pH to about 3 to 6, d. mixing said slurry with the silica sol-clay slurry, e. spray drying and recovering the catalyst product.
Claim 2
Dependent Claim
101 words
A process for preparing a cracking catalyst having high activity and high density which comprises: a. preparing a silica sol having a silica content of about 1 to 8 weight percent which is essentially free of sodium and passing said solution through an ion exchange resin bed, b. adding clay in an amount equal to 0-70 weight percent of the finished catalyst to said sol, c. preparing a water slurry of a faujasitic zeolitic aluminosilicate and adjusting the pH to about 3 to 6, d. mixing said slurry with the silica sol-clay slurry, e. spray drying and recovering the catalyst product.
Claim 3
Dependent Claim
41 words
The process according to claim 1 wherein the zeolite is a faujasite that has been pretreated to reduce the Na 2 O content to less than 3% and exchanged to a rare earth content of 0 to 24 percent by weight.
Claim 4
Dependent Claim
20 words
The process according to claim 1 wherein the clay is selected from the group consisting of kaolin, halloysite and montmorillonite.
Claim 5
Dependent Claim
22 words
The process according to claim 1 wherein the zeolite is present as about 3 to 60 weight percent of the final catalyst.
Claim 6
Dependent Claim
136 words
A process for preparing a cracking catalyst having a high density and high activity which comprises: a. preparing a silica sol which is essentially free of sodium by diluting a sodium silicate solution to a concentration of about 1 to 8 percent and passing said solution through an ion exchange resin bed, b. adding kaolin in an amount equal to 0 to 70 weight percent of the finished catalyst to said sol, c. preparing a water slurry of a faujasitic aluminosilicate having an Na 2 O content of less than 1 percent and a rare earth content of about 5 to 18 weight percent, d. mixing the aluminosilicate slurry in an amount equal to 3 to 60 weight percent of the final catalyst with the silica sol-clay slurry, e. spray drying and recovering the catalyst product.
Claim 7
Dependent Claim
136 words
A process for preparing a cracking catalyst having a high density and high activity which comprises: a. preparing a silica sol which is essentially free of sodium by diluting a sodium silicate solution to a concentration of about 1 to 8 percent and passing said solution through an ion exchange resin bed, b. adding kaolin in an amount equal to 0 to 70 weight percent of the finished catalyst to said sol, c. preparing a water slurry of a faujasitic aluminosilicate having an Na 2 O content of less than 1 percent and a rare earth content of about 5 to 18 weight percent, d. mixing the aluminosilicate slurry in an amount equal to 3 to 60 weight percent of the final catalyst with the silica sol-clay slurry, e. spray drying and recovering the catalyst product.
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) | 1979-08-03 | 1980-02-02 | 1980-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-03 | 1984-02-02 | 1984-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-03 | 1988-02-02 | 1988-08-03 | $7700.00 | Window Closed / Lapsed |