US4628135A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Integrated process for converting oxygenates to liquid hydrocarbons
Assignee: Mobil Oil AS
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Filing: 1985-09-23
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Granted: 1986-12-09
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Expires: 2005-09-23
Abstract
Abstract Alkylate is produced by catalytically converting oxygenate feedstock, such as methanol, to lower olefins comprising dominantly C2-C4 olefins. Ethene is separated from primary stage effluent by interstage sorption of C3+ components which may be upgraded. Isoparaffin may be alkylated with C3-C4 olefins in a secondary stage. The improved technique comprises fractionating an olefinic feedstream containing ethene and C3+ olefinic components by contacting the olefinic feedstream in a sorption zone with a liquid hydrocarbon sorbent to selectively sorb C3+ components; wherein the sorbent is obtained by condensing C5+ aliphatic and aromatic hydrocarbon from the primary stage.
Inventors
- 👤 Hartley Owen
- 👤 Samuel A. Tabak
- 👤 Bernard S. Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:22
CPC Classifications
C; C07; C07C; C07C1/00; C07C1/20; C07C2527/00; C07C2527/06; C07C2527/08; C07C2527/12; C07C2527/1206; C07C2529/00; C07C2529/04; C07C2529/06; C07C2529/40; Y; Y02; Y02P; Y02P20/00; Y02P20/10; Y02P30/00; Y02P30/20; Y02P30/40
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
250 words
An integrated continuous process for converting oxygenated organic feedstock to liquid hydrocarbons comprising the steps of (a) contacting feedstock with zeolite catalyst in a primary catalyst stage at elevated temperature to convert at least a portion of the feedstock oxygenate predominantly to an olefinic fraction rich in C 2 -C 4 olefins and a minor heavy hydrocarbon portion containing C 5 + aliphatic and aromatic hydrocarbons; (b) cooling and separating effluent from step (a) to provide an aqueous liquid byproduct stream, a heavy hydrocarbon liquid stream and a light hydrocarbon stream rich in C 2 -C 4 olefins; (c) compressing and contacting the light hydrocarbon stream in a sorption tower with a liquid hydrocarbon sorbent stream containing a major amount of said heavy liquid stream from step (b) to selectively sorb C 3 + components in a liquid sorbate stream; (d) fractionating the sorbate stream to provide a gasoline-rich stream and a light hydrocarbon stream rich in C 3 -C 4 olefins; (e) further reacting the olefinic light hydrocarbon stream from step (d) with isoparaffin in a secondary alkylation stage in the presence of liquid phase acid catalyst to convert at least a portion of C 3 -C 4 olefins to a heavier C 7 + liquid hydrocarbon product stream comprising alkylate gasoline; (f) recycling ethene in a gaseous stream from the sorption tower to the primary catalytic stage for further conversion; and (g) recycling a portion of gasoline from step (d) to step (c) for use as lean sorbent.
Claim 2
Dependent Claim
250 words
An integrated continuous process for converting oxygenated organic feedstock to liquid hydrocarbons comprising the steps of (a) contacting feedstock with zeolite catalyst in a primary catalyst stage at elevated temperature to convert at least a portion of the feedstock oxygenate predominantly to an olefinic fraction rich in C 2 -C 4 olefins and a minor heavy hydrocarbon portion containing C 5 + aliphatic and aromatic hydrocarbons; (b) cooling and separating effluent from step (a) to provide an aqueous liquid byproduct stream, a heavy hydrocarbon liquid stream and a light hydrocarbon stream rich in C 2 -C 4 olefins; (c) compressing and contacting the light hydrocarbon stream in a sorption tower with a liquid hydrocarbon sorbent stream containing a major amount of said heavy liquid stream from step (b) to selectively sorb C 3 + components in a liquid sorbate stream; (d) fractionating the sorbate stream to provide a gasoline-rich stream and a light hydrocarbon stream rich in C 3 -C 4 olefins; (e) further reacting the olefinic light hydrocarbon stream from step (d) with isoparaffin in a secondary alkylation stage in the presence of liquid phase acid catalyst to convert at least a portion of C 3 -C 4 olefins to a heavier C 7 + liquid hydrocarbon product stream comprising alkylate gasoline; (f) recycling ethene in a gaseous stream from the sorption tower to the primary catalytic stage for further conversion; and (g) recycling a portion of gasoline from step (d) to step (c) for use as lean sorbent.
Claim 3
Dependent Claim
10 words
The process of claim 1 wherein said isoparaffin comprises isobutane.
Claim 4
Dependent Claim
43 words
The process of claim 1 wherein the primary stage catalyst comprises ZSM-5 type zeolite and ethene is recycled to the primary stage at a rate of about 1 to 20 parts ethene per 100 parts by weight of methanol equivalent in the feedstock.
Claim 5
Dependent Claim
46 words
The process of claim 1 wherein primary stage feedstock comprising methanol and/or dimethyl ether and recycled ethene are converted over HZSM-5 catalyst to provide a light olefinic hydrocarbon vapor stream comprising a major amount of C 3 -C 4 olefins and a minor amount of ethene.
Claim 6
Dependent Claim
61 words
The process of claim 4 wherein olefin production is optimized by employing fluid bed primary stage conditions in the temperature range of about 425° C. to 550° C., a pressure range of about 100 to 800 kPa and weight hourly space velocity range of about 0.5 to 3.0 based on ZSM-5 equivalent catalyst and methanol equivalent in the primary stage feedstock.
Claim 7
Dependent Claim
28 words
The process of claim 4 wherein primary stage hydrocarbon effluent contains about 1 to 10 wt.% ethene and about 10 to 60 wt.% C 3 -C 4 olefins.
Claim 8
Dependent Claim
24 words
The process of claim 1 wherein the alkylation stage effluent is fractionated to provide a hydrocarbon product comprising C 7 to C 9 isoparaffin.
Claim 9
Dependent Claim
18 words
The process of claim 1 wherein the secondary alkylation stage comprises a liquid phase reaction catalyzed by HF.
Claim 10
Dependent Claim
140 words
A continuous process for converting oxygenated aliphatic feedstock to olefins comprising contacting the feedstock with a zeolite conversion catalyst in a primary catalytic stage at elevated temperature and low pressure to produce ethene, C 3 -C 4 olefins and heavier hydrocarbons comprising C 5 + aliphatic and aromatic hydrocarbons components; cooling and separating the primary stage effluent to provide an olefinic C 4 - vapor stream and a liquid heavier hydrocarbon stream; compressing the olefinic C 4 - vapor stream and contacting at least a portion of the liquid heavier hydrocarbon stream with the compressed stream in a countercurrent sorption fractionator under pressure and conditions to selectively sorb C 3 + olefins from the compressed stream, thereby providing an ethene-rich vapor stream; further upgrading the sorbed C 3 + olefins in a second catalytic stage to produce liquid hydrocarbon product.
Claim 11
Dependent Claim
140 words
A continuous process for converting oxygenated aliphatic feedstock to olefins comprising contacting the feedstock with a zeolite conversion catalyst in a primary catalytic stage at elevated temperature and low pressure to produce ethene, C 3 -C 4 olefins and heavier hydrocarbons comprising C 5 + aliphatic and aromatic hydrocarbons components; cooling and separating the primary stage effluent to provide an olefinic C 4 - vapor stream and a liquid heavier hydrocarbon stream; compressing the olefinic C 4 - vapor stream and contacting at least a portion of the liquid heavier hydrocarbon stream with the compressed stream in a countercurrent sorption fractionator under pressure and conditions to selectively sorb C 3 + olefins from the compressed stream, thereby providing an ethene-rich vapor stream; further upgrading the sorbed C 3 + olefins in a second catalytic stage to produce liquid hydrocarbon product.
Claim 12
Dependent Claim
107 words
The process of claim 9 wherein the olefinic C 4 - vapor stream is compressed in multiple compression steps, thereby condensing a portion of the C 3 -C 4 olefins as a pressurized liquid stream, combining said C 3 -C 4 olefinic liquid with the liquid sorbate stream comprising C 3 + olefins from the sorption fractionator; further fractionating the combined liquid streams in debutanizing tower to provide a C 4 - feedstream to the second catalytic stage and a C 5 + gasoline stream; and recycling a portion of the C 5 + gasoline stream from the debutanizer tower to the sorption fractionator as sorbent liquid.
Claim 13
Dependent Claim
32 words
The process of claim 1 wherein the heavy hydrocarbon liquid stream recovered from the primary stage effluent consists essentially of C 5 + hydrocarbons rich in C 6 -C 9 + aromatics.
Claim 14
Dependent Claim
24 words
The process of claim 11 wherein the heavy hydrocarbon liquid stream is fractionated to recover C 9 + aromatics and a liquid sorbent stream.
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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) | 1989-12-08 | 1990-06-09 | 1990-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-08 | 1994-06-09 | 1994-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-08 | 1998-06-09 | 1998-12-09 | $7700.00 | Window Closed / Lapsed |