US4476338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Olefins from methanol and/or dimethyl ether
Assignee: Mobil Oil AS
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Filing: 1983-06-02
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Granted: 1984-10-09
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Expires: 2003-06-02
Abstract
Abstract A process for converting methanol and/or dimethyl ether to olefins at moderate temperature and atmospheric pressure comprising contacting the feed with an alumina crystalline zeolite catalyst designated as ZSM-48. The olefins formed can then be converted to a low-durene gasoline over ZSM-5 type catalysts under conventional aromatizing conditions or to a distillate boiling above the gasoline range.
Inventors
- 👤 Clarence D. Chang
- 👤 Cynthia T. W. Chu
- 👤 Patrick D. Perkins
- 👤 Ernest W. Valyocsik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:31
CPC Classifications
C; C10; C10G; C10G3/00; C10G3/42; C10G3/44; C10G3/48; C10G3/49; C07; C07C; C07C1/00; C07C1/20; C07C2/00; C07C2529/00; C07C2529/04; C07C2529/06; C07C2529/40; C07C2529/70; C10G2300/00; C10G2300/40; C10G2300/4006; C10G2300/4012; C10G2300/4018; C10G2400/00; C10G2400/02; C10G2400/04; C10G2400/10; C10G2400/20; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
114 words
A method for converting a feed to light olefins, said feed consisting essentially of one or more compounds selected from the group consisting of a lower monohydric alcohol with up to four carbon atoms and their simple and mixed ether derivatives, said method comprising passing said feed over a catalyst contained in a reaction zone at a space velocity of about 1 to about 100 LHSV with the temperature in said reaction zone at about 500° F. to about 1000° F. and a pressure of about 1 psia to about 15 psia, said catalyst comprising crystalline aluminosilicate zeolite ZSM-48, withdrawing from said reaction zone an effluent comprising a hydrocarbon mixture containing said light olefins.
Claim 2
Independent Claim
114 words
A method for converting a feed to light olefins, said feed consisting essentially of one or more compounds selected from the group consisting of a lower monohydric alcohol with up to four carbon atoms and their simple and mixed ether derivatives, said method comprising passing said feed over a catalyst contained in a reaction zone at a space velocity of about 1 to about 100 LHSV with the temperature in said reaction zone at about 500° F. to about 1000° F. and a pressure of about 1 psia to about 15 psia, said catalyst comprising crystalline aluminosilicate zeolite ZSM-48, withdrawing from said reaction zone an effluent comprising a hydrocarbon mixture containing said light olefins.
Claim 3
Dependent Claim
39 words
The method of claim 1 wherein said feed is passed over said catalyst at a space velocity of about 1 to about 10 LHSV with the temperature in said reaction zone at about 600° F. to about 900° F.
Claim 4
Dependent Claim
18 words
The method of claim 1 wherein said feed comprises methanol or a mixture of methanol and dimethyl ether.
Claim 5
Dependent Claim
15 words
The method of claim 1 wherein said effluent is treated to separate said light olefins.
Claim 6
Dependent Claim
68 words
The method of claim 1 comprising contacting said effluent in a subsequent reaction zone with a subsequent stage zeolite catalyst having a constraint index of 1 to 12 and a silica to alumina ratio of at least 12, said contacting being under aromatizing conditions at an elevated temperature and a pressure of 15 to 300 psia, thereby forming a subsequent stage conversion product comprising gasoline boiling range hydrocarbons.
Claim 7
Dependent Claim
22 words
The method of claim 5 wherein the temperature in said subsequent reaction zone is from about 600° F. to about 1200° F.
Claim 8
Dependent Claim
26 words
The method of claim 5 including the step of removing gasoline products from said effluent prior to contacting said effluent with said subsequent stage zeolite catalyst.
Claim 9
Dependent Claim
25 words
The method of claim 5 including the step of removing steam from said effluent prior to contacting said effluent with said subsequent stage zeolite catalyst.
Claim 10
Dependent Claim
21 words
The method of claim 5 wherein said subsequent stage zeolite catalyst is selected from the group consisting of HZSM-5 and ZnZSM-5.
Claim 11
Dependent Claim
18 words
The method of claim 5 wherein said feed comprises methanol or a mixture of methanol and dimethyl ether.
Claim 12
Dependent Claim
74 words
The method of claim 1 comprising contacting said effluent in a subsequent reaction zone with a subsequent stage zeolite catalyst, said catalyst having a constraint index of 1 to 12 and a silica to alumina mol ratio of at least about 12, said contacting being under conditions of elevated temperatures of from about 300°-600° F. and a pressure of from about 100-1000 psig to from a distillate range hydrocarbon boiling above about 330° F.
Claim 13
Dependent Claim
13 words
The method of claim 11 wherein said subsequent stage zeolite catalyst is HZSM-5.
Claim 14
Dependent Claim
18 words
The method of claim 11 wherein said feed comprises methanol or a mixture of methanol and dimethyl ether.
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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) | 1987-10-09 | 1988-04-09 | 1988-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-09 | 1992-04-09 | 1992-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-09 | 1996-04-09 | 1996-10-09 | $7700.00 | Window Closed / Lapsed |