Conversion of oxygenates to gasoline at variable inlet temperature
AssigneeMobil Oil Corporation
InventorSergei Yurchak
Life of this patent
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Abstract
A catalytic conversion process for reacting lower aliphatic C.sub.1 -C.sub.4 oxygenates, such as methanol, to produce gasoline boiling range hydrocarbons. Improved cycle average gasoline yield is sustained without a substantial reduction in cycle average gasoline octane number by selectively programming the conversion reactor inlet temperature during a process cycle.
Claims16
In a process for converting at least 99.9% of C.sub.1 -C.sub.4 oxygenates to primarily C.sub.5 + gasoline boiling range hydrocarbons with a crystalline zeolite conversion catalyst, the improvement which comprises,
- selectively programming a conversion reactor inlet temperature during a process cycle so as to increase cycle average gasoline yeld without a substantial reduction in cycle average gasoline octane number.
A process for converting at least 99.9% of lower aliphati oxygenated hydrocarbon feedstock to primarily C.sub.5 + aromatic-rich gasoline range hydrocarbons comprising to step of:
- (a) contacting the feedstock with a fixed bed of acidic shape selective medium pore zeolite conversion catalyst particles at elevated inlet temperature under conversion conditions sufficient ot provide essentially quantitative conversion of siad feedstock;
- (b) increasing said inlet temperature incrementally during the process cycle by an amount just sufficient to maintain at least 99.9% conversion of said feedstock;
- (c) terminating the process cycle when feedstock conversion falls below 99.9%, whereby an improved cycle avearage gasoline yield is achieved at high octane value.
A process for converting at least 99.9% of lower aliphatic oxygeanted hydrocarbon feedstock to primarily C.sub.5 + aromatic-rich gasoline range hydrocarbons comprising the step of:
- (a) contacting the feedstock with a fixed bed of acidic shape selective medium pore zeolite conversion catalyst particles at elevated inlet temperature under conversion conditions sufficient to produce said gasoline;
- (b) increasing the inlet temperature incrementally during the process cycle while maintaining essentially constant octane value for the gasoline produced;
- (c) terminating the process cycle coincident with either the degradation of gasoline product octane value or a reduction in feedstock conversion below 99.9%, whereby improved cycle average gasoline product yields are achieved.
Dependencies are inferred from the claim text.