US4423268A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low pressure oligomerization of gaseous olefins
Assignee: Chevron USA Inc
•
Filing: 1982-01-08
•
Granted: 1983-12-27
•
Expires: 2002-01-08
Abstract
Abstract A process for oligomerizing normally gaseous olefins over essentially alumina free molecular sieves at low pressures is disclosed.
Inventors
- 👤 Stephen J. Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:42
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/02; C07C2/04; C07C2/06; C07C2/08; C07C2/12; C07C2529/00; C07C2529/03; C07C2529/035; C07C2529/04; C07C2529/06; C07C2529/70
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
62 words
A process for oligomerizing normally gaseous alkenes, comprising: (a) contacting under low pressure oligomerization conditions a feed comprising normally gaseous alkenes with a catalyst comprising an essentially alumina free intermediate pore size silicaceous crystalline molecular sieve having a silica:alumina mole ratio greater than about 200:1, selected from silicalite, CZM, or mixtures thereof; and (b) recovering an effluent comprising oligomers of said alkenes.
Claim 2
Dependent Claim
62 words
A process for oligomerizing normally gaseous alkenes, comprising: (a) contacting under low pressure oligomerization conditions a feed comprising normally gaseous alkenes with a catalyst comprising an essentially alumina free intermediate pore size silicaceous crystalline molecular sieve having a silica:alumina mole ratio greater than about 200:1, selected from silicalite, CZM, or mixtures thereof; and (b) recovering an effluent comprising oligomers of said alkenes.
Claim 3
Dependent Claim
19 words
The process of claim 1 in which said oligomerization conditions include a temperature of less than about 325° C.
Claim 4
Dependent Claim
24 words
The process of claim 2 wherein said oligomerization conditions include a pressure less than about 30 bar and a temperature above about 50° C.
Claim 5
Dependent Claim
16 words
The process of claim 1 wherein said alkenes are propene, 1-butene, 2-butene, 2-methylpropene and mixtures thereof.
Claim 6
Dependent Claim
23 words
The process of claim 1, wherein said catalyst further comprises zinc or a compound thereof, cadmium or a compound thereof, or mixtures thereof.
Claim 7
Dependent Claim
18 words
The process of claim 1 wherein said molecular sieve has a silica:alumina mole ratio greater than about 500:1.
Claim 8
Dependent Claim
18 words
The process of claim 1 wherein said molecular sieve has a silica:alumina mole ratio greater than about 1000:1.
Claim 9
Dependent Claim
33 words
The process of claim 1 further comprising the steps of: periodically removing said catalyst from contact with said feed, stripping said catalyst with a stripping gas, and resuming said contacting under oligomerization conditions.
Claim 10
Dependent Claim
36 words
The process of claim 1, further comprising the steps of: separating unreacted alkenes present in said effluent from alkene oligomers present in said effluent and recycling said unreacted alkenes into the feed for said contacting step.
Claim 11
Dependent Claim
17 words
The process of claim 1, 2, or 3, further comprising the step of: hydrogenating said alkene oligomers.
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) | 1986-12-26 | 1987-06-27 | 1987-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-26 | 1991-06-27 | 1991-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-26 | 1995-06-27 | 1995-12-27 | $7700.00 | Window Closed / Lapsed |