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US 8,969,640 B2Granted
Dehydrogenation of alkanols to increase yield of aromatics
AssigneeVirent, Inc.
InventorsPaul G. Blommel, Li Yuan, Matthew Van Straten, Warren Lyman, Randy D. Cortright
Life of this patent
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Abstract
The present invention provides methods, reactor systems, and catalysts for increasing the yield of aromatic hydrocarbons produced while converting alkanols to hydrocarbons. The invention includes methods of using catalysts to increase the yield of benzene, toluene, and mixed xylenes in the hydrocarbon product.
Claims22
A method of converting alkanols to aromatic hydrocarbons comprising:
- partially dehydrogenating a C1-C6 alkanol feedstock in the presence of a dehydrogenation catalyst at an effective dehydrogenation temperature and dehydrogenation pressure to produce hydrogen and a mixture of oxygenate components comprising (a) unreacted C1-C6 alkanol and (b) a carboxylic acid, an aldehyde, an ester or any combination thereof;
- wherein at least a portion of the oxygenate components in the mixture have a hydrogen to carbon effective ratio of less than 1.6 and wherein the extent of partial dehydrogenation results in the mixture of oxygenate components having a total hydrogen to carbon effective ratio of between 1.0 and 1.5;
- and
- exposing the mixture of oxygenate components to a zeolite oxygenate conversion catalyst at an oxygenate conversion temperature and an oxygenate conversion pressure to produce aromatic hydrocarbons.
1 more element
A method of converting ethanol to aromatic hydrocarbons comprising:
- partially dehydrogenating an ethanol feedstock in the presences of a dehydrogenation catalyst at an effective dehydrogenation temperature and dehydrogenation pressure to produce a mixture of oxygenate components comprising ethanol, acetaldehyde, acetic acid, and ethyl acetate, wherein the extent of partial dehydrogenation results in the mixture of oxygenate components having a total hydrogen to carbon effective ratio of between 1.0 and 1.5;
- exposing the mixture of oxygenate components to a zeolite oxygenate conversion catalyst at an oxygenate conversion temperature and an oxygenate conversion pressure to produce aromatic hydrocarbons.
A method of converting alkanols to aromatic hydrocarbons comprising:
- partially dehydrogenating a C1-C6 alkanol feedstock in the presence of a dehydrogenation catalyst at an effective dehydrogenation temperature and dehydrogenation pressure to produce hydrogen and a mixture of oxygenate components comprising (a) unreacted C1-C6 alkanol and (b) a carboxylic acid, an aldehyde, an ester, or any combination thereof;
- wherein at least a portion of the oxygenate components in the mixture have a hydrogen to carbon effective ratio of less than 1.6 and wherein the extent of partial dehydrogenation results in the mixture of oxygenate components having a total hydrogen to carbon effective ratio of between 1.0 and 1.5;
- separating the mixture of oxygenate components into a first oxygenate stream having a total hydrogen to carbon effective ratio of between 1.0 and 1.5 and a second oxygenate stream;
- exposing the first oxygenate stream to an a zeolite conversion catalyst at an oxygenate conversion temperature and an oxygenate conversion pressure to produce aromatic hydrocarbons;
- and
- exposing the second oxygenate stream to the dehydrogenation catalyst at an effective dehydrogenation temperature and dehydrogenation pressure to produce hydrogen and an additional mixture of oxygenate components.
3 more elements
Dependencies are inferred from the claim text.