US4098678A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cracking catalyst activity maintenance for catalytic cracking process
Assignee: Individual
•
Filing: 1977-08-22
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Granted: 1978-07-04
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Expires: 1997-08-22
Abstract
Abstract The activity maintenance of silica containing catalysts used in catalytic cracking operations is improved by the addition to the system of a silica containing compound or mixture which is in a form and in an amount that will readily vaporize in the steam added to or formed in the process. By the method of operation, the refiner is able to realize substantial savings in the amount of catalyst make-up required to maintain a given activity level in the unit.
Inventors
- 👤 Eugene F. Schwarzenbek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:55
CPC Classifications
C; C10; C10G; C10G11/00; C10G11/02; C10G11/14; C10G11/18
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
28 words
A method of minimizing the deactivation of silica containing catalysts employed in catalytic cracking operations by feeding to the reactor, stripper and regeneration sections steam saturated with silica.
Claim 2
Independent Claim
28 words
A method of minimizing the deactivation of silica containing catalysts employed in catalytic cracking operations by feeding to the reactor, stripper and regeneration sections steam saturated with silica.
Claim 3
Dependent Claim
32 words
The process of claim 1 further characterized in that the silica is present in a vaporous form in the steam in a concentration between 0.2 and 20 parts per million by weight.
Claim 4
Independent Claim
49 words
A method of minimizing the deactivation of silica containing catalysts employed in catalytic cracking operations by feeding to the reactor, stripper, and regeneration sections steam saturated with silica, the silica used to saturate the steam being derived from the group consisting of the inorganic and organic compounds of silicon.
Claim 5
Independent Claim
49 words
A method of minimizing the deactivation of silica containing catalysts employed in catalytic cracking operations by feeding to the reactor, stripper, and regeneration sections steam saturated with silica, the silica used to saturate the steam being derived from the group consisting of the inorganic and organic compounds of silicon.
Claim 6
Dependent Claim
21 words
The process of claim 3 further characterized in that the silica used to saturate the steam is derived from silicic acid.
Claim 7
Dependent Claim
20 words
The process of claim 3 further characterized in that the silica is in the form of a silicon dioxide hydrate.
Claim 8
Dependent Claim
21 words
The process of claim 3 further characterized in that the silica used to saturate the steam is derived from ethyl ortho-silicate.
Claim 9
Independent Claim
47 words
A method of minimizing the deactivation of silica containing catalysts employed in catalytic cracking operations by feeding to the reactor, stripper and regeneration sections steam saturated with silica, in which the steam is sufficiently superheated to contain the desired amount of silica at the existing steam pressure.
Claim 10
Independent Claim
47 words
A method of minimizing the deactivation of silica containing catalysts employed in catalytic cracking operations by feeding to the reactor, stripper and regeneration sections steam saturated with silica, in which the steam is sufficiently superheated to contain the desired amount of silica at the existing steam pressure.
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) | 1981-07-03 | 1982-01-02 | 1982-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-03 | 1986-01-02 | 1986-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-03 | 1990-01-02 | 1990-07-04 | $7700.00 | Window Closed / Lapsed |