US4498976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Suppression of light gas production in cracking processes by the addition of highly siliceous materials having high surface area and low acidity
Assignee: Mobil Oil AS
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Filing: 1982-04-15
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Granted: 1985-02-12
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Expires: 2002-04-15
Abstract
Abstract A method for suppressing light gas production in a cracking process by dispersing in the feed low concentrations of a highly siliceous material having high surface area and low acidity prior to cracking. Because of the high surface area-to-volume ratio of the particles, the catalyst acts as a free radical scavenger which reduces the amount of light gas produced by free radical-promoted reactions.
Inventors
- 👤 Thomas F. Degnan
- 👤 Randall D. Partridge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:14
CPC Classifications
C; C10; C10G; C10G11/00; C10G11/02; C10G11/04; C10G11/05
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
103 words
In a process for reducing light hydrocarbon production and increasing the overall yield of gasoline and distillate range products in a high temperature thermal process which employs temperatures ranging from about 510° C. to 650° C., the improvement which comprises adding to the hydrocarbon chargestock about 0.01 to 5 percent by weight of a highly siliceous zeolite catalyst material having a silica-to-alumina ratio of at least about 50 comprising at least about 98% by weight of silica having a particle diameter ranging from about 0.5 to 200 microns and a surface area of at least about 100 m 2 /g of catalyst material.
Claim 2
Dependent Claim
103 words
In a process for reducing light hydrocarbon production and increasing the overall yield of gasoline and distillate range products in a high temperature thermal process which employs temperatures ranging from about 510° C. to 650° C., the improvement which comprises adding to the hydrocarbon chargestock about 0.01 to 5 percent by weight of a highly siliceous zeolite catalyst material having a silica-to-alumina ratio of at least about 50 comprising at least about 98% by weight of silica having a particle diameter ranging from about 0.5 to 200 microns and a surface area of at least about 100 m 2 /g of catalyst material.
Claim 3
Dependent Claim
32 words
The process of claim 1 wherein the high temperature thermal process employs an LHSV ranging from about 0.25 to 25 hr -1 , and pressures ranging from about 0 to 100 psig.
Claim 4
Dependent Claim
23 words
The process of claim 1 wherein about one percent by weight of the highly siliceous catalyst material is added to the hydrocarbon chargestock.
Claim 5
Dependent Claim
48 words
The process of claim 1 wherein the highly siliceous catalyst material is a crystalline zeolite having a silica-to-alumina ratio ranging from about 50 to 1000 and an acid activity of less than about 0.1 meq NH 3 per 100 g of catalyst as measured by thermogravimetric ammonia desorption.
Claim 6
Dependent Claim
12 words
The process of claim 4 wherein the crystalline zeolite material is mordenite.
Claim 7
Dependent Claim
12 words
The process of claim 4 wherein the crystalline zeolite material is faujasite.
Claim 8
Dependent Claim
32 words
The process of claim 6 wherein the faujasite has a silica-to-alumina ratio of about 50, and an acid activity of less than about 0.05 meq NH 3 per 100 g of catalyst.
Claim 9
Dependent Claim
18 words
The process of claim 7 wherein the faujasite has a framework silica-to-alumina ratio of about 75 to 1,000.
Claim 10
Dependent Claim
19 words
The process of claim 8 wherein the particle diameter of the crystalline zeolite is less than about 32 microns.
Claim 11
Dependent Claim
18 words
The process of claim 7 wherein about 1 percent of crystalline zeolite material is added to the chargestock.
Claim 12
Dependent Claim
20 words
The process of claim 1, 4, 7 or 9 wherein the catalyst material is added to a preheated hydrocarbon chargestock.
Claim 13
Dependent Claim
18 words
The process of claim 1, 4, 7 or 9 wherein the high temperature thermal process is thermal cracking.
Claim 14
Dependent Claim
25 words
The process of claim 1, 4, 7 or 9 wherein the high temperature thermal process is operated in a high temperature fluidized catalytic cracking unit.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-02-12 | 1988-08-13 | 1989-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-12 | 1992-08-13 | 1993-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-12 | 1996-08-13 | 1997-02-12 | $7700.00 | Window Closed / Lapsed |