Patent US4374295A successfully refreshed from Google Patents.
US4374295A
Expired / Lapsed
US
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Catalytic conversion of methanol to light olefins
Assignee: Mobil Oil AS
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Filing: 1982-04-15
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Granted: 1983-02-15
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Expires: 2002-04-15
Abstract
Abstract A process for converting a methanol feed to light olefins over a zeolite catalyst comprising at least some crystalline aluminosilicate zeolitic material having a Constraint Index of about 1 to 12 and a silica/alumina mole ratio of at least about 12, e.g., ZSM-5, in the presence of an aldehyde-containing diluent comprising formaldehyde, acetaldehyde or mixtures thereof, under methanol conversion conditions. By using such a ZSM-5 type zeolite catalyst and an aldehyde-containing diluent, methanol can be converted to an olefin-containing hydrocarbon product enriched in C2 to C4 olefins such as ethylene.
Inventors
- 👤 Carol S. Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:03
CPC Classifications
C; C07; C07C; C07C1/00; C07C1/20; C07C2529/00; C07C2529/04; C07C2529/06; C07C2529/40; C07C2529/65; C07C2529/70; Y; Y02; Y02P; Y02P30/00; Y02P30/20; Y02P30/40
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
102 words
In a process for producing a hydrocarbon mixture containing light olefins by contacting a methanol feed with a catalyst comprising a crystalline aluminosilicate zeolite having a Constraint Index of about 1 to 12 and a silica to alumina molar ratio of at least about 12, said contacting occurring in a reaction zone under methanol conversion reaction conditions, the improvement which comprises: co-feeding to said reaction zone along with said methanol feed an aldehyde-containing diluent comprising formaldehyde, acetaldehyde or a mixture thereof, in an amount sufficient to increase the selectivity of the conversion reaction for production of C 2 to C 4 olefins.
Claim 2
Dependent Claim
102 words
In a process for producing a hydrocarbon mixture containing light olefins by contacting a methanol feed with a catalyst comprising a crystalline aluminosilicate zeolite having a Constraint Index of about 1 to 12 and a silica to alumina molar ratio of at least about 12, said contacting occurring in a reaction zone under methanol conversion reaction conditions, the improvement which comprises: co-feeding to said reaction zone along with said methanol feed an aldehyde-containing diluent comprising formaldehyde, acetaldehyde or a mixture thereof, in an amount sufficient to increase the selectivity of the conversion reaction for production of C 2 to C 4 olefins.
Claim 3
Dependent Claim
15 words
A process according to claim 1 wherein the aldehyde component of said diluent is formaldehyde.
Claim 4
Dependent Claim
20 words
A process according to claim 1 wherein said zeolite is selected from ZSM-5, ZSM-11, ZSM-12, ZSM-23, ZSM-35, ZSM-38 and ZSM-48.
Claim 5
Dependent Claim
35 words
A process according to claim 3 wherein the methanol conversion reaction conditions include a temperature of from about 200° C. to 500° C., and a reaction zone pressure from about 5 psia to 500 psia.
Claim 6
Dependent Claim
38 words
A process according to claim 3 wherein the weight hourly space velocity of the aldehyde in said diluent ranges from about 0.00025 to 1.5 and the molar ratio of aldehyde to methanol ranges from about 0.001:1 to 0.1:1.
Claim 7
Dependent Claim
15 words
A process according to claim 5 wherein said diluent comprises mixtures of formaldehyde and water.
Claim 8
Dependent Claim
40 words
A process according to claim 6 wherein said methanol feed is admixed with water and with said diluent such that water is present in an amount of from about 1 mol to 10 mols of water per mole of methanol.
Claim 9
Dependent Claim
24 words
A process according to claim 1, 2, 3, 4, 5, 6 or 7 wherein said catalyst further comprises a binder for said zeolite material.
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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) | 1986-02-14 | 1986-08-16 | 1987-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-14 | 1990-08-16 | 1991-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-14 | 1994-08-16 | 1995-02-15 | $7700.00 | Window Closed / Lapsed |