Preheating methanol effects steady state operation of conversion to gasoline
AssigneeMobil Oil Corporation
InventorsClarence D. Chang, Anthony J. Silvestri, John C. Zahner
Life of this patent
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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.
Claims10
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.degree. 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.
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.degree. to 900.degree. 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.
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.degree. to 900.degree. 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.
Dependencies are inferred from the claim text.