US4471147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Olefin fractionation and catalytic conversion system
Assignee: Mobil Oil AS
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Filing: 1983-06-29
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Granted: 1984-09-11
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Expires: 2003-06-29
Abstract
Abstract A continuous catalytic process for converting an olefinic feedstock comprising ethylene and C3+ olefins to heavier liquid hydrocarbon product comprising the steps of (a) prefractionating the olefinic feedstock to obtain a gaseous stream rich in ethylene and a liquid stream containing C3+ olefins; (b) vaporizing and contacting the liquid stream from the prefractionating step with hydrocarbon conversion oligomerization catalyst in a catalytic reactor system to provide a heavier hydrocarbon effluent stream comprising distillate, gasoline and lighter hydrocarbons; (c) fractionating the effluent stream to recover distillate, gasoline and lighter hydrocarbons separately; (d) recycling at least a portion of the recovered gasoline as a liquid sorption stream to prefractionating step (a); and (e) further reacting the recycled gasoline together with sorbed C3+ olefins in the catalytic reactor system of step (b).
Inventors
- 👤 Hartley Owen
- 👤 Chung H. Hsia
- 👤 Bernard S. Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:43
CPC Classifications
C; C10; C10G; C10G50/00; F; F02; F02B; F02B3/00; F02B3/06; Y; Y10; Y10S; Y10S203/00; Y10S203/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
137 words
A continuous catalytic process for converting a fraction of olefinic feedstock comprising ethylene and C 3 + olefins to heavier liquid hydrocarbon product comprising the steps of (a) prefractionating the olefinic feedstock to obtain a gaseous stream rich in ethylene and a liquid stream containing C 3 + olefin; (b) Vaporizing and contacting the liquid stream from the prefractionating step with hydrocarbon conversion oligomerization catalyst in a catalytic reactor system to provide a heavier hydrocarbon effluent stream comprising distillate, gasoline and lighter hydrocarbons; (c) fractionating the effluent stream to recover distillate, gasoline and lighter hydrocarbons separately; (d) recycling at least a portion of the recovered gasoline as a liquid sorption stream to prefractionating step (a); and (e) further reacting the recycled gasoline together with sorbed C 3 + olefin in the catalytic reactor system of step (b).
Claim 2
Dependent Claim
137 words
A continuous catalytic process for converting a fraction of olefinic feedstock comprising ethylene and C 3 + olefins to heavier liquid hydrocarbon product comprising the steps of (a) prefractionating the olefinic feedstock to obtain a gaseous stream rich in ethylene and a liquid stream containing C 3 + olefin; (b) Vaporizing and contacting the liquid stream from the prefractionating step with hydrocarbon conversion oligomerization catalyst in a catalytic reactor system to provide a heavier hydrocarbon effluent stream comprising distillate, gasoline and lighter hydrocarbons; (c) fractionating the effluent stream to recover distillate, gasoline and lighter hydrocarbons separately; (d) recycling at least a portion of the recovered gasoline as a liquid sorption stream to prefractionating step (a); and (e) further reacting the recycled gasoline together with sorbed C 3 + olefin in the catalytic reactor system of step (b).
Claim 3
Dependent Claim
34 words
The process of claim 1 comprising the additional step of contacting the ethylene rich gaseous stream from prefractionating step (a) with a minor amount of distillate liquid absorbent to provide a purified ethylene product.
Claim 4
Dependent Claim
37 words
The process of claim 2 wherein the distillate liquid is a recycled distillate from fractionating step (c) and wherein said distillate absorbent liquid is combined with reactor effluent from the catalytic reactor prior to fractionating step (c).
Claim 5
Dependent Claim
19 words
The process of claim 2 wherein the purified ethylene product has an average molecular weight not greater than 28.5.
Claim 6
Dependent Claim
15 words
The process of claim 1 wherein the recycled gasoline comprises C 5 + olefinic components.
Claim 7
Dependent Claim
46 words
The process of claim 1 wherein the oligomerization catalyst comprises a shape-selective medium pore crystalline aluminosilicate zeolite having a silica:alumina mole ratio of at least 12 and a constraint index of about 1 to 12, and wherein olefins are oligomerized in the essential absence of hydrogen.
Claim 8
Dependent Claim
20 words
The process of claim 6 wherein the catalyst comprises HZSM-5 having an acid cracking activity of about 160 to 200.
Claim 9
Dependent Claim
24 words
The process of claim 1 wherein the olefinic feedstock comprises about 10 to 50 mole % ethylene and 10 to 50 mole % propene.
Claim 10
Dependent Claim
21 words
The process of claim 1 wherein gasoline is recycled at a weight ratio to olefinic feedstock of at least about 3:1.
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) | 1987-09-11 | 1988-03-12 | 1988-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-11 | 1992-03-12 | 1992-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-11 | 1996-03-12 | 1996-09-11 | $7700.00 | Window Closed / Lapsed |