US4605807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for catalytic conversion of ethylene to higher hydrocarbons
Assignee: Atlantic Richfield Co
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Filing: 1985-05-06
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Granted: 1986-08-12
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Expires: 2005-05-06
Abstract
Abstract A method for converting normally gaseous olefins (esp., ethylene) to normally liquid hydrocarbons wherein the olefin feed is contacted with a siliceous molecular sieve at elevated temperatures and short olefin contact times under high severity conditions favorable for substantial conversion of olefins with maximized liquids productivity. ZSM-5 type zeolites and crystalline borosilicate molecular sieves are particularly preferred catalysts.
Inventors
- 👤 Harry Mazurek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:25
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/02; C07C2/04; C07C2/06; C07C2/08; C07C2/12; C07C2529/00; C07C2529/04; C07C2529/06; C07C2529/40
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
55 words
A process for converting ethylene to normally liquid hydrocarbons which comprises contacting a gas comprising ethylene with a siliceous crystalline molecular sieve under high severity conditions including elevated temperatures and short olefin contact times, said conditions being selected such that the liquids productivity of the catalyst is greater than about 50% of the theoretical maximum.
Claim 2
Dependent Claim
55 words
A process for converting ethylene to normally liquid hydrocarbons which comprises contacting a gas comprising ethylene with a siliceous crystalline molecular sieve under high severity conditions including elevated temperatures and short olefin contact times, said conditions being selected such that the liquids productivity of the catalyst is greater than about 50% of the theoretical maximum.
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein the temperature is selected within the range of about 285° to 425° C.
Claim 4
Dependent Claim
20 words
The process of claim 1 wherein the contact time is selected within the range of about 0.1 to 3 seconds.
Claim 5
Dependent Claim
23 words
The method of claim 3 wherein the ethylene partial pressure in the feed is within the range of about 0.5 to 5 atmospheres.
Claim 6
Dependent Claim
15 words
The method of claim 1 wherein the molecular sieve is an acid ZSM-5 type catalyst.
Claim 7
Dependent Claim
27 words
The method of claim 5 wherein said conditions are selected such that the liquids productivity of the catalyst is greater than about 75% of the theoretical maximum.
Claim 8
Dependent Claim
17 words
The method of claim 1 wherein the molecular sieve is an essentially aluminum-free siliceous crystalline molecular sieve.
Claim 9
Dependent Claim
12 words
The method of claim 1 wherein the molecular sieve is a borosilicate.
Claim 10
Dependent Claim
27 words
The method of claim 8 wherein said conditions are selected such that the liquids productivity of the catalyst is greater than about 75% of the theoretical maximum.
Claim 11
Dependent Claim
12 words
The method of claim 1 wherein the molecular sieve is a silicate.
Claim 12
Dependent Claim
12 words
The method of claim 1 wherein the molecular sieve is a silicoaluminophosphate.
Claim 13
Dependent Claim
65 words
The method of claim 1 wherein normally gaseous, C 3 + hydrocarbons are recovered from the effluent produced by said contacting and are contacted in a second oligomerization zone with a siliceous crystalline molecular sieve at moderate temperature under conditions favorable for conversion of C 3 + olefins to a second oligomerization effluent stream rich in heavier hydrocarbons in the gasoline or distillate boiling range.
Claim 14
Dependent Claim
14 words
The method of claim 1 wherein said molecular sieve is at least periodically regenerated.
Claim 15
Dependent Claim
20 words
The method of claim 13 wherein said molecular sieve continuously recirculates between an olefin contact zone and a regeneration zone.
Claim 16
Dependent Claim
24 words
The process of claim 1 wherein the gas contacted with the molecular sieve comprises an olefinic fraction containing greater than 50 volume percent ethylene.
Claim 17
Dependent Claim
24 words
The process of claim 1 wherein the gas contacted with the molecular sieve comprises an olefinic fraction containing greater than 70 volume percent ethylene.
Claim 18
Dependent Claim
17 words
The process of claim 1 wherein the temperature is selected within the range of about 325°-375° C.
Claim 19
Dependent Claim
20 words
The process of claim 1 wherein the contact time is selected within the range of about 0.1 to 1 second.
Claim 20
Dependent Claim
15 words
The process of claim 8 wherein ethylene is converted in the substantial absence of hydrogen.
References Cited (Backward Citations)
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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) | 1989-08-11 | 1990-02-10 | 1990-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-11 | 1994-02-10 | 1994-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-11 | 1998-02-10 | 1998-08-12 | $7700.00 | Window Closed / Lapsed |