US4414423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multistep oligomerization process
Assignee: Chevron USA Inc
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Filing: 1981-09-25
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Granted: 1983-11-08
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Expires: 2001-09-25
Abstract
Abstract A multistep process for preparing high-boiling hydrocarbons from normally gaseous hydrocarbons is disclosed.
Inventors
- 👤 Stephen J. Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:11
CPC Classifications
C; C07; C07C; C07C11/00; C07C11/02; C07C2/00; C07C2/02; C07C2/04; C07C2/06; C07C2/08; C07C2/12; C07C2529/00; C07C2529/03; C07C2529/035; C07C2529/04; C07C2529/06; C07C2529/40
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
127 words
A process for preparing high boiling hydrocarbons from normally gaseous olefins, comprising: (a) contacting a feed comprising normally gaseous olefins with a first catalyst comprising an intermediate pore size silicaceous crystalline molecular sieve substantially free of hydrogen transfer activity selected from silicalite, an organosilicate disclosed in RE 29,948 and CZM, to produce a first effluent comprising normally liquid olefins; and (b) contacting at least part of the normally liquid olefins contained in said first effluent with a second catalyst comprising an intermediate pore size silicaceous crystalline molecular sieve substantially free of hydrogen transfer activity under oligomerization conditions to produce a second effluent wherein said second effluent comprises oligomers of said normally liquid olefins and wherein at least some of said oligomers are liquids under said oligomerization conditions.
Claim 2
Dependent Claim
127 words
A process for preparing high boiling hydrocarbons from normally gaseous olefins, comprising: (a) contacting a feed comprising normally gaseous olefins with a first catalyst comprising an intermediate pore size silicaceous crystalline molecular sieve substantially free of hydrogen transfer activity selected from silicalite, an organosilicate disclosed in RE 29,948 and CZM, to produce a first effluent comprising normally liquid olefins; and (b) contacting at least part of the normally liquid olefins contained in said first effluent with a second catalyst comprising an intermediate pore size silicaceous crystalline molecular sieve substantially free of hydrogen transfer activity under oligomerization conditions to produce a second effluent wherein said second effluent comprises oligomers of said normally liquid olefins and wherein at least some of said oligomers are liquids under said oligomerization conditions.
Claim 3
Dependent Claim
18 words
The process of claim 1, further comprising the step of hydrogenating at least part of said second effluent.
Claim 4
Dependent Claim
29 words
The process of claim 1, further comprising: separating unreacted normally gaseous olefins from said first effluent; and recycling the olefins so separated back into the feed of step (a).
Claim 5
Dependent Claim
29 words
The process of claim 1, further comprising: separating unreacted normally liquid olefins from said second effluent; and recycling the olefins so separated back into the feed for step (b).
Claim 6
Dependent Claim
17 words
The process of claim 1 wherein said contacting of step (a) is performed at substantially atmospheric pressure.
Claim 7
Dependent Claim
23 words
The process of claim 1, 2, 3, 4, or 5 wherein the pressure in said second zone is greater than about 30 bar.
Claim 8
Dependent Claim
18 words
The process of claim 6 wherein the pressure in said second zone is greater than about 60 bar.
Claim 9
Dependent Claim
23 words
The process of claim 1, 2, 3, 4, or 5 wherein the temperature in said second zone is less than about 350° C.
Claim 10
Dependent Claim
33 words
The process of claim 1, 2, 3, 4, or 5 wherein said catalyst further comprises nickel or a compound thereof, zinc or a compound thereof, cadmium or a compound thereof, or mixtures thereof.
Claim 11
Dependent Claim
40 words
The process of claim 1, 2, 3, 4, or 5, further comprising the steps of: periodically stopping the contacting with the catalyst of step (a), step (b), or both, stripping said catalyst with a stripping gas, and resuming said contacting.
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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) | 1986-11-07 | 1987-05-09 | 1987-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-07 | 1991-05-09 | 1991-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-07 | 1995-05-09 | 1995-11-08 | $7700.00 | Window Closed / Lapsed |