US4044061A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preheating methanol effects steady state operation of conversion to gasoline
Assignee: Mobil Oil AS
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Filing: 1976-02-17
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Granted: 1977-08-23
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Expires: 1996-02-17
Abstract
Abstract The conversion of methanol to gasoline boiling hydrocarbons in a thermally balanced operation with a special group of zeolite catalysts having a constraint index of 1 to 12, a silica to alumina ratio of at least about 12 and a crystal density of not substantially lower than about 1.6 grams per cubic centimeter is described. The steady state operation of the process is improved by feeding methanol preheated to a selected temperature proximate to its boiling point so that the heat required thereafter to vaporize the feed and to raise its temperature to conversion temperature is substantially equal to the exothermicity of the conversion itself.
Inventors
- 👤 Clarence D. Chang
- 👤 Anthony J. Silvestri
- 👤 John C. Zahner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:14
CPC Classifications
C; C07; C07C; C07C1/00; C07C1/20; C10; C10G; C10G3/00; C10G3/42; C10G3/44; C10G3/48; C10G3/49; C10G3/60; C07C2529/00; C07C2529/04; C07C2529/06; C07C2529/40; C07C2529/65; C07C2529/70; C10G2300/00; C10G2300/40; C10G2300/4006; C10G2300/4012; C10G2400/00; C10G2400/02; Y; Y02; Y02P; Y02P30/00; Y02P30/20; Y10; Y10S; Y10S585/00; Y10S585/949; Y10S585/951
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
98 words
In a process for the catalytic conversion of methanol to form a gaoline boiling range hydrocarbons under exothermic reaction conditions within the range of 689 to 747 BTU/LB in the presence of a crystalline zeolite conversion catalyst, the improvement which comprises, limiting the adiabatic reactor effluent temperature of the exothermic conversion of methanol to gasoline below about 900° F by preheating the methanol feed only sufficient to take advantage of the exothermic reaction heat for providing latent heat of vaporization of the preheated feed plus the sensible heat required to take the preheated feed up to reaction temperature.
Claim 2
Dependent Claim
98 words
In a process for the catalytic conversion of methanol to form a gaoline boiling range hydrocarbons under exothermic reaction conditions within the range of 689 to 747 BTU/LB in the presence of a crystalline zeolite conversion catalyst, the improvement which comprises, limiting the adiabatic reactor effluent temperature of the exothermic conversion of methanol to gasoline below about 900° F by preheating the methanol feed only sufficient to take advantage of the exothermic reaction heat for providing latent heat of vaporization of the preheated feed plus the sensible heat required to take the preheated feed up to reaction temperature.
Claim 3
Independent Claim
77 words
A method for effecting the exothermic catalytic conversion of methanol to gasoline boiling hydrocarbons at a reaction effluent temperature restricted to within the range of 600° to 900° F which comprises effecting the exothermic catalytic conversion of methanol at a pressure within the range of 0 to 200 psig and maintaining the exothermic reaction parameters within preferred limits by restricting the preheating of the methanol charged to the conversion operation within the limits defined by FIG. I.
Claim 4
Independent Claim
77 words
A method for effecting the exothermic catalytic conversion of methanol to gasoline boiling hydrocarbons at a reaction effluent temperature restricted to within the range of 600° to 900° F which comprises effecting the exothermic catalytic conversion of methanol at a pressure within the range of 0 to 200 psig and maintaining the exothermic reaction parameters within preferred limits by restricting the preheating of the methanol charged to the conversion operation within the limits defined by FIG. I.
Claim 5
Independent Claim
77 words
A method for effecting the exothermic catalytic conversion of methanol to gasline boiling hydrocarbons at a reaction effluent temperature restricted to within the range of 600° to 900° F which comprises effecting the exothermic catalytic conversion of methanol at a pressure within the range of 0 to 200 psig and maintaining the exothermic reaction parameters within preferred limits by restricting the prehating of the methanol charged to the conversion operation within the limits defined by FIG. II.
Claim 6
Independent Claim
77 words
A method for effecting the exothermic catalytic conversion of methanol to gasline boiling hydrocarbons at a reaction effluent temperature restricted to within the range of 600° to 900° F which comprises effecting the exothermic catalytic conversion of methanol at a pressure within the range of 0 to 200 psig and maintaining the exothermic reaction parameters within preferred limits by restricting the prehating of the methanol charged to the conversion operation within the limits defined by FIG. II.
Claim 7
Dependent Claim
22 words
The process of claim 1 wherein partially heated methanol feed is introduced sequentially to said catalyst in the direction of reactant flow.
Claim 8
Dependent Claim
28 words
The process of claim 1 wherein the crystalline zeolite conversion catalyst is selected from a class of crystalline zeolites represented by ZSM5, ZSM11, ZSM12, and ZSM21 crystalline zeolites.
Claim 9
Dependent Claim
19 words
The process of claim 1 wherein the crystalline zeolite catalyst is arranged in more than one sequential catalyst beds.
Claim 10
Dependent Claim
17 words
The process of claim 1 wherein the operation is maintained under conditions producing an aromatic gasoline product.
Claim 11
Dependent Claim
17 words
The process of claim 1 wherein the operation is maintained under conditions producing an olefinic gasoline product.
Claim 12
Dependent Claim
21 words
The process of claim 1 wherein the operating pressure is maintained below 75 psig and the methanol feed is partially vaporized.
Claim 13
Dependent Claim
25 words
The process of claim 1 wherein the operating pressure is maintained above 75 psig and the methanol feed is in a preheated liquid phase condition.
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) | 1980-08-22 | 1981-02-21 | 1981-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-22 | 1985-02-21 | 1985-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-22 | 1989-02-21 | 1989-08-23 | $7700.00 | Window Closed / Lapsed |