Patent US571894A successfully refreshed from Google Patents.
Patent US5026463A successfully refreshed from Google Patents.
US3676522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disproportionation and isomerization for isopentane production
Assignee: Chevron USA Inc
•
Filing: 1971-01-18
•
Granted: 1972-07-11
•
Expires: 1991-01-18
Abstract
Abstract A process for producing isopentane which comprises: (a) disproportionating a normal butane-rich fraction in a C4 disproportionation zone to obtain C3 and n-pentane; (b) disproportionating a normal hexane-rich fraction in a C6 disproportionation zone to obtain n-pentane and C7; (c) fractionating the C3, nC5 effluent and the nC5, C7 effluent to obtain nC5; and (d) isomerizing at least a portion of the normal pentane from both steps (a) and (b) in an isomerization zone to obtain isopentane. It is preferred to further integrate the disproportionation zones with the isomerization zone using common fractionation facilities.
Inventors
- 👤 Robert P Sieg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:53
CPC Classifications
C; C07; C07C; C07C9/00; C07C9/14; C07C9/16; C07C9/18; C07C5/00; C07C5/22; C07C5/27; C07C5/2767; C07C5/277; C07C5/2791; C07C6/00; C07C6/08; C07C6/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
28 words
A process in accordance with claim 1 wherein common fractionation facilities are used at least in part for effluent hydrocarbons from the disproportionation zones and the isomerization zone.
Claim 2
Dependent Claim
40 words
A process in accordance with claim 1 wherein the same fractionation column is used for the fractionation of normal pentane from C6 alkanes present as a mixture in effluent hydrocarbons from both the isomerization zone and the C6 disproportionation zone.
Claim 3
Dependent Claim
19 words
A process in accordance with claim 1 wherein the isomerization catalyst comprises palladium or platinum with a crystalline aluminosilicate.
Claim 4
Dependent Claim
31 words
A process in accordance with claim 1 wherein the isomerization catalyst comprises 0.05 to 5.0 weight percent palladium and 0.05 to 5.0 weight percent chromium on a layered clay-type crystalline aluminosilicate.
Claim 5
Dependent Claim
49 words
A process in accordance with claim 1 wherein the normal butane and the normal hexane disproportionation reactions are carried out at a temperature between 400* and 850* F. using a catalyst comprising a noble metal on an alumina support and a Group VIB metal compound on a silica support.
Claim 6
Dependent Claim
61 words
A process in accordance with claim 1 wherein the normal butane and normal hexane disproportionation reactions are carried out by a process comprising contacting the C6 alkanes with a catalytic mass comprising platinum on alumina and tungsten or tungsten oxide on silica at a temperature between about 650* and 850* F. and a pressure between about 100 psia and 1,500 psia.
Claim 7
Dependent Claim
23 words
A process in accordance with claim 7 wherein the olefin concentration in the disproportionation reaction zone is maintained below about 5 volume percent.
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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |