US4778944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic isomerization of sulfur-containing feedstocks
Assignee: Katalistiks International Inc
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Filing: 1986-10-10
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Granted: 1988-10-18
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Expires: 2006-10-10
Abstract
Abstract Catalytic isomerization of paraffinic feedstocks containing at least about 2 ppm by weight sulfur is effected using an isomerization catalyst comprising a hydrogenation/dehydrogenation catalyst supported on molecular sieve without undue loss of catalytic activity or selectivity by maintaining the water content of the feedstock below about 5 ppm by weight water.
Inventors
- 👤 Andrew S. Zarchy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:49
CPC Classifications
C; C10; C10G; C10G35/00; C10G35/04; C10G35/06; C10G35/095; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/18; B01J29/20; B01J29/22; C07; C07C; C07C5/00; C07C5/22; C07C5/27; C07C5/2767; C07C5/277; C07C5/2791
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
107 words
A process for upgrading the octane of an isomerable hydrocarbon feedstock comprising at least about 60 mole % praaffinic C 5 and C 6 hydrocarbons and at least 1 ppm sulfur and at least 5 ppm water in which the feedstock is combined with H 2 and passed through an isomerization reactor containing an isomerization catalyst comprising noble metal supported on molecular sieve under isomerization conditions, the improvement comprising; drying the feedstock prior to contact with the isomerization catalyst until the concentration of water in the feedstock is reduced to a level below at least 3 ppm by weight whereby the isomerization catalyst becomes substantially sulfur tolerant.
Claim 2
Dependent Claim
107 words
A process for upgrading the octane of an isomerable hydrocarbon feedstock comprising at least about 60 mole % praaffinic C 5 and C 6 hydrocarbons and at least 1 ppm sulfur and at least 5 ppm water in which the feedstock is combined with H 2 and passed through an isomerization reactor containing an isomerization catalyst comprising noble metal supported on molecular sieve under isomerization conditions, the improvement comprising; drying the feedstock prior to contact with the isomerization catalyst until the concentration of water in the feedstock is reduced to a level below at least 3 ppm by weight whereby the isomerization catalyst becomes substantially sulfur tolerant.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein the isomerization catalyst comprises at least one of platinum and palladium on a molecular sieve.
Claim 4
Dependent Claim
20 words
The process of claim 2 wherein the sulfur content of the feedstock is at least about 10 ppm by weight.
Claim 5
Dependent Claim
14 words
The process of claim 2 wherein the drying is effected by molecular sieve adsorbent.
Claim 6
Dependent Claim
18 words
The process of claim 1 wherein the catalyst comprises at least one of platinum and palladium on mordenite.
References Cited (Backward Citations)
US3925503A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-18 | 1992-04-18 | 1992-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-18 | 1996-04-18 | 1996-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-18 | 2000-04-18 | 2000-10-18 | $7700.00 | Window Closed / Lapsed |