Olefin methylation for production of low aromatic gasoline
AssigneeExxonMobil Technology and Engineering Company
InventorsBrandon J. O'Neill, Mark A. Deimund, Ajit B. Dandekar
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Abstract
Systems and methods are provided for conversion of a combined feed of oxygenates (such as methanol or dimethyl ether) and olefins to a high octane naphtha boiling range product with a reduced or minimized aromatics content. The oxygenate conversion can be performed under conditions that reduce or minimize hydrogen transfer. Optionally, a catalyst that further facilitates formation of branched paraffins can be used, such as a catalyst that has some type of 12-member ring site available on the catalyst surface.
Claims14
A method for forming a naphtha composition, comprising:
- exposing a feed comprising oxygenates and olefins to a conversion catalyst at an average reaction temperature of 230° C. to 280° C., a total pressure of 1 psig (˜7 kPa-g) to 400 psig (˜2700 kPa-g), and an oxygenate weight hourly space velocity of 0.1 hr−1 to 10.0 hr−1, to form a converted effluent comprising a net yield of 10 wt % or more of a C5+ fraction relative to a combined weight of the oxygenates and olefins, the C5+ fraction comprising 15 wt % or less aromatics, relative to a weight of the C5+ fraction, and having a research octane number (RON) of 80 or more, the feed comprising a molar ratio of oxygenates to olefins of 1 to 20,
- wherein the conversion catalyst comprises 10 wt % or more of a zeolite having a MOR framework structure.
A method for forming a naphtha composition, comprising:
- exposing a feed comprising oxygenates and olefins to a conversion catalyst at an average reaction temperature of 230° C. to 300° C., a total pressure of 1 psig (˜7 kPa-g) to 400 psig (˜2700 kPa-g), and an oxygenate weight hourly space velocity of 0.1 hr−1 to 10.0 hr−1, to form a converted effluent comprising a net yield of 10 wt % or more of a C5+ fraction relative to a combined weight of the oxygenates and olefins, the C5+ fraction comprising 15 wt % or less aromatics, relative to a weight of the C5+ fraction, and having a research octane number (RON) of 85 or more, the feed comprising a molar ratio of oxygenates to olefins of 1 to 20,
- wherein the conversion catalyst comprises 10 wt % or more of a zeolite having a framework structure of MWW, MOR, or a combination thereof.
Dependencies are inferred from the claim text.