US4254297A
Expired / Lapsed
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Process for the conversion of dimethyl ether
Assignee: DSM BV
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Filing: 1979-11-27
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Granted: 1981-03-03
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Expires: 1999-11-27
Abstract
Abstract Process for the conversion of dimethyl ether into a mixture of substantially aliphatic hydrocarbons and water by means of a catalyst containing boron. The dimethyl ether is put in contact, at a temperature of over 250° C., with a catalyst that consists of a crystalline modification of silica in whose crystal lattice a number of silicon atoms have been replaced by boron atoms. The amount of boron in the crystalline modificaton, expressed as the molar ratio of the oxides B 2 O 3 and SiO 2 , may vary between 0.0005 and 0.025.
Inventors
- 👤 Petrus M. G. Frenken
- 👤 Joseph J. F. Scholten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:25
CPC Classifications
C; C07; C07C; C07C1/00; C07C1/20; B; B01; B01J; B01J29/00; B01J29/86; C10; C10G; C10G3/00; C10G3/42; C10G3/44; C10G3/48; C10G3/49; C07C2521/00; C07C2521/06; C07C2521/08; C07C2529/00; C07C2529/86; C10G2300/00; C10G2300/40; C10G2300/4006; C10G2300/4018
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
67 words
Process for the conversion of dimethyl ether into a mixture of substantially aliphatic hydrocarbons and water by means of a catalyst containing boron, characterized in that dimethyl ether is put in contact, at a temperature of over 250° C., with a catalyst containing boron that consists of a crystalline modification of silica in whose crystal lattice a number of silicon atoms have been replaced by boron atoms.
Claim 2
Dependent Claim
67 words
Process for the conversion of dimethyl ether into a mixture of substantially aliphatic hydrocarbons and water by means of a catalyst containing boron, characterized in that dimethyl ether is put in contact, at a temperature of over 250° C., with a catalyst containing boron that consists of a crystalline modification of silica in whose crystal lattice a number of silicon atoms have been replaced by boron atoms.
Claim 3
Dependent Claim
37 words
Process according to claim 1, characterized in that the amount of boron in the crystalline modification, expressed as the molar ratio of the oxides B 2 O 3 and SiO 2 , varies between 0.0005 and 0.025.
Claim 4
Dependent Claim
23 words
Process according to claims 1 or 2, characterized in that the conversion is effected at a temperature of between 250° and 550° C.
Claim 5
Dependent Claim
29 words
Process according to claims 1 or 3, characterized in that dimethyl ether is passed over the catalyst with a space velocity of between 1.0 and 10 hour -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) | 1984-03-02 | 1984-09-01 | 1985-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-02 | 1988-09-01 | 1989-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-02 | 1992-09-01 | 1993-03-03 | $7700.00 | Window Closed / Lapsed |