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US 7,402,719 B2Granted
Catalytic oxidative dehydrogenation, and microchannel reactors for catalytic oxidative dehydrogenation
AssigneeVelocys, Inc.
InventorsJohn H. Brophy, Kai Jarosch, Terry J. Mazanec, Matthew B. Schmidt, Laura J. Silva, Anna Lee Tonkovich, Fred Pesa, David J. Hesse
Life of this patent
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Abstract
The invention provides methods of oxidative dehydrogenation (ODH). Conducting ODH in microchannels has unexpectedly been found to yield superior performance when compared to the same reactions at the same conditions in larger reactors. ODH methods employing a Mo—V—Mg—O catalyst is also described. Microchannel apparatus for conducting ODH is also disclosed.
Claims28
A method for catalytic oxidative dehydrogenation of a gaseous hydrocarbon, comprising:
- flowing a hydrocarbon-containing fluid and a source of oxygen into a microchannel;
- wherein a catalyst is present in the microchannel;
- reacting the hydrocarbon-containing fluid and the source of oxygen, in the microchannel, in a temperature range of 335 to 1000° C.,
- to form water and at least one alkene and/or aralkene;
- and wherein said method is characterized by superior conversion, selectivity and/or yield, such that, as compared to a reaction conducted under the same conditions (reactant feed composition, oxidant, diluent, ratios of feed/oxidant/diluent (with diluent level as close as practicable), contact time, pressure, catalyst bed temperature, catalyst composition and form) in a 1.0 cm inner diameter quartz tube with no active cooling and pre-mixed hydrocarbon and oxidant, the results of the method exhibits one or more of the following:
- (a) an at least 20% relative higher ratio of selectivities of CO/CO2;
- or
- (b) an at least 10% relative higher conversion of hydrocarbon;
- or
- (c) an at least 10% relative higher yield of olefins;
- or
- (d) an at least 10% relative higher selectivity to olefins;
- or
- (e) an at least 10% relative lower selectivity of carbon dioxide.
11 more elements
A method of oxidatively dehydrogenating a gaseous hydrocarbon, comprising:
- flowing a hydrocarbon-containing fluid and a source of oxygen into a microchannel;
- wherein an oxidative dehydrogenation catalyst is present in the microchannel;
- reacting the hydrocarbon-containing fluid and the source of oxygen, in the microchannel, in a temperature range of 300 to 1000° C.,
- to form water and at least one alkene and/or aralkene;
- wherein the hydrocarbon comprises an alkane or aralkane, and wherein at least 10% of the hydrocarbon is converted to an alkene and/or aralkene;
- and wherein total hydrocarbon feed flow through the microchannel is at a LHSV of about 32 or greater.
3 more elements
Dependencies are inferred from the claim text.