US4814543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nitrogen resistant paraffin hydroisomerization catalysts
Assignee: Mobil Oil AS
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Filing: 1987-12-28
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Granted: 1989-03-21
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Expires: 2007-12-28
Abstract
Abstract The present invention includes a process and catalyst composition for paraffinic isomerization of a hydrocarbon feedstock which has a paraffin content having no more than 20 carbon atoms per molecule. The feedstock is contacted with a crystalline aluminosilicate zeolite catalyst having pore openings defined by: (1) a ratio of sorption of n-hexane to o-xylene, on a volume percent basis, of greater than about 3, which sorption is determined at a P/Po of 0.1 and at a temperature of 50 DEG C. for n-hexane and 80 DEG C. for o-xylene and (2) by the ability of selectively cracking 3-methylpentane (3MP) in preference to the doubly branched 2,3-dimethylbutane (DMB) at 1000 DEG F. and 1 atmosphere pressure from a 1/1/1 weight ratio mixture of n-hexane/3-methyl-pentane/2,3-dimethylbutane, with the ratio of rate constants k3MP/kDMB determined at a temperature of 1000 DEG F. being in excess of about 2, e.g., ZSM-22, ZSM-23, AXM-35 and mixtures thereof, in combination with a Group VIII metal, and having a zeolite SiO2/Al2O3 ratio of at least about 20:1 at a temperature and pressure suitable for isomerization.
Inventors
- 👤 Nai Y. Chen
- 👤 William E. Garwood
- 👤 Sharon B. McCullen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:27
CPC Classifications
C; C07; C07B; C07B35/00; C07B35/08; C10; C10G; C10G45/00; C10G45/58; C10G45/60; C10G45/64; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/064; B01J29/068; B01J29/65; B01J29/66; B01J29/67; B01J29/70; B01J29/72; B01J29/74; B01J29/7484; B01J29/7492; C07C; C07C5/00; C07C5/22; C07C5/27; C07C5/2767; C07C5/277; C07C5/2791; B01J2229/00; B01J2229/30; B01J2229/42
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
211 words
A process for paraffin isomerization of a distillate range hydrocarbon feedstock having a boiling range of from about 330° F.-650° F. and a paraffinic content of molecules with not more than about 20 carbon atoms, and containing nitrogen impurities of at least 20 ppm, comprising: contacting said paraffin-containing feedstock with a catalyst including a crystalline zeolite catalyst having pore openings defined by: (1) a ratio of sorption of n-hexane to o-xylene, on a volume percent basis, of greater than about 3, which sorption is determined at a P/P o of 0.1 and at a temperature of 50° C. for n-hexane and 80° C. for o-xylene and (2) by the ability of selectively cracking 3-methylpentane (3MP) in preference to the doubly branched 2,3dimethylbutane (DMB) at 1000° F. and 1 atmosphere pressure from a 1/1/1 weight ratio mixture of n-hexane/3-methyl-pentane-2,3dimethylbutane, with the ratio of rate constants k 3MP /k DMB determined at a temperature of 1000° F. being in excess of about 2, said catalyst including a Group VIII metal, and having a zeolite SiO 2 /Al 2 O 3 ratio of at least about 20:1, said contacting made at a temperature of from about 390° F. to about 850° F. and a pressure of from about 100 psig to about 1,000 psig.
Claim 2
Dependent Claim
211 words
A process for paraffin isomerization of a distillate range hydrocarbon feedstock having a boiling range of from about 330° F.-650° F. and a paraffinic content of molecules with not more than about 20 carbon atoms, and containing nitrogen impurities of at least 20 ppm, comprising: contacting said paraffin-containing feedstock with a catalyst including a crystalline zeolite catalyst having pore openings defined by: (1) a ratio of sorption of n-hexane to o-xylene, on a volume percent basis, of greater than about 3, which sorption is determined at a P/P o of 0.1 and at a temperature of 50° C. for n-hexane and 80° C. for o-xylene and (2) by the ability of selectively cracking 3-methylpentane (3MP) in preference to the doubly branched 2,3dimethylbutane (DMB) at 1000° F. and 1 atmosphere pressure from a 1/1/1 weight ratio mixture of n-hexane/3-methyl-pentane-2,3dimethylbutane, with the ratio of rate constants k 3MP /k DMB determined at a temperature of 1000° F. being in excess of about 2, said catalyst including a Group VIII metal, and having a zeolite SiO 2 /Al 2 O 3 ratio of at least about 20:1, said contacting made at a temperature of from about 390° F. to about 850° F. and a pressure of from about 100 psig to about 1,000 psig.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein said crystalline aluminosilicate catalyst is selected from the group consisting of ZSM-22, ZSM-23, and ZSM-35.
Claim 4
Dependent Claim
24 words
The process of claim 1 wherein said Group VIII metal is selected from the group consisting of Pt, Pd, Ir, Os, Rh and Ru.
Claim 5
Dependent Claim
32 words
The process of claim 1 wherein said metal is incorporated into said zeolite by ion exchange to a metal content in the range of from about 0.01% to about 10.0% by weight.
Claim 6
Dependent Claim
18 words
The process of claim 3 wherein said metal content is from about 0.1% to about 3.0% by weight.
Claim 7
Dependent Claim
22 words
The process of claim 1 wherein said zeolite is supported in a binder selected from one of silica, alumina, silica-alumina, and titania.
Claim 8
Dependent Claim
19 words
The process of claim 1 wherein said paraffin content has molecules of no greater than about 16 carbon atoms.
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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) | 1992-03-20 | 1992-09-19 | 1993-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-20 | 1996-09-19 | 1997-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-20 | 2000-09-19 | 2001-03-21 | $7700.00 | Window Closed / Lapsed |