US4450311A
Expired / Lapsed
US
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Heat exchange technique for olefin fractionation and catalytic conversion system
Assignee: Mobil Oil AS
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Filing: 1983-06-29
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Granted: 1984-05-22
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Expires: 2003-06-29
Abstract
Abstract A heat balanced technique for converting an olefinic feedstock comprising ethylene and C3+ olefins to heavier liquid hydrocarbon product in a catalytic exothermic process. Methods and means are provided for prefractionating the olefinic feedstock to obtain a gaseous stream rich in ethylene and a liquid stream containing C3+ olefin, and contacting an olefinic feedstock stream from the prefractionating step with ZSM-5 type oligomerization catalyst in a series of exothermic catalytic reactors to provide a heavier hydrocarbon effluent stream comprising distillate, gasoline and lighter hydrocarbons. In a preferred embodiment a catalytic system is provided for making gasoline or diesel fuel from an olefinic feestock containing ethylene and C3+ lower olefins comprising a prefractionation system for separating and recovering ethylene and a liquid stream rich in C3+ olefins; a multi-stage adiabatic downflow reactor system operatively connected for serially contacting olefinic feedstock with a plurality of fixed shape selective oligomerization catalyst beds; means for thermally exchanging hot reactor effluent from at least one catalyst bed with at least a portion of a prefractionation liquid stream for reboiling the liquid stream; and means for recovering gasoline and diesel product from the catalytic system.
Inventors
- 👤 Bernard S. Wright
- 👤 Hartley Owen
- 👤 Chung H. Hsia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:59
CPC Classifications
C; C10; C10G; C10G50/00; F; F02; F02B; F02B3/00; F02B3/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
170 words
A continuous catalytic process for converting an 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 at least one exothermic catalytic reaction zone to provide a heavier hydrocarbon effluent stream comprising distillate, gasoline and lighter hydrocarbons; (c) cooling and 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 sorbent stream to prefractionating step (a); (e) further reacting the recycled gasoline together with sorbed C 3 + olefin in the catalytic reactor system of step (b); and (f) exchanging heat between hot effluent from said exothermic reaction zone and at least a portion of prefractionating liquid rich in C 3 + olefin in a prefractionator reboiler loop.
Claim 2
Dependent Claim
170 words
A continuous catalytic process for converting an 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 at least one exothermic catalytic reaction zone to provide a heavier hydrocarbon effluent stream comprising distillate, gasoline and lighter hydrocarbons; (c) cooling and 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 sorbent stream to prefractionating step (a); (e) further reacting the recycled gasoline together with sorbed C 3 + olefin in the catalytic reactor system of step (b); and (f) exchanging heat between hot effluent from said exothermic reaction zone and at least a portion of prefractionating liquid rich in C 3 + olefin in a prefractionator reboiler loop.
Claim 3
Dependent Claim
78 words
A process for producing liquid predominantly distillate-range hydrocarbons according to claim 1 further comprising: reacting olefinic feedstock in a series of fixed bed adiabatic reactors at elevated pressure and at a temperature of about 190° C. to 315° C. with a maximum temperature rise of about 30° C. in each reactor; cooling each reactor effluent prior to further exothermic oligomerization; and heat exchanging at least one reactor effluent stream with the liquid prefractionation stream to vaporize sorbed hydrocarbons.
Claim 4
Dependent Claim
48 words
A process according to claim 1 wherein said hot reactor effluent containing light gas, olefinic C 5 + gasoline and distillate range hydrocarbon components is fractionated to separate said effluent components utilizing heat values from the hot water effluent to vaporize a liquid hydrocarbon effluent fractionation tower stream.
Claim 5
Dependent Claim
27 words
A process according to claim 3 wherein partially cooled effluent following heat exchange with the liquid prefractionation stream is further utilized to reboil a light gas deethanizer.
Claim 6
Dependent Claim
16 words
A process according to claim 1 wherein the catalyst consists essentially of acid ZSM-5 type zeolite.
Claim 7
Dependent Claim
177 words
A heat balanced catalytic exothermic process for converting an 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 ZSM-5 type oligomerization catalyst in a series of exothermic catalytic reactors to provide a heavier hydrocarbon effluent stream comprising distillate, gasoline and lighter hydrocarbons; (c) cooling and fractionating the effluent stream to recover olefinic gasoline as a liquid sorbent stream to prefractionating step (a); (e) reacting the gasoline rich in sorbed C 3 + olefin in the catalytic reactor system of step (b); (f) exchanging heat between hot effluent from at least one reactor and at least a portion of prefractionation liquid rich in C 3 + olefin in a prefractionator reboiler loop; further exchanging the hot reactor effluent from at least one reactor with olefin-rich feedstock and/or a liquid stream in effluent fractionating step (c).
Claim 8
Dependent Claim
177 words
A heat balanced catalytic exothermic process for converting an 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 ZSM-5 type oligomerization catalyst in a series of exothermic catalytic reactors to provide a heavier hydrocarbon effluent stream comprising distillate, gasoline and lighter hydrocarbons; (c) cooling and fractionating the effluent stream to recover olefinic gasoline as a liquid sorbent stream to prefractionating step (a); (e) reacting the gasoline rich in sorbed C 3 + olefin in the catalytic reactor system of step (b); (f) exchanging heat between hot effluent from at least one reactor and at least a portion of prefractionation liquid rich in C 3 + olefin in a prefractionator reboiler loop; further exchanging the hot reactor effluent from at least one reactor with olefin-rich feedstock and/or a liquid stream in effluent fractionating step (c).
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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) | 1987-05-22 | 1987-11-21 | 1988-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-22 | 1991-11-21 | 1992-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-22 | 1995-11-21 | 1996-05-22 | $7700.00 | Window Closed / Lapsed |