Catalytic oxidative steam dehydrogenation process
AssigneeUop LLC
InventorsTamotsu Imai, Deng-Yang Jan
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Abstract
A novel process is disclosed for the steam dehydrogenation of dehydrogenatable hydrocarbons in the vapor phase in conjunction with oxidative reheating of the intermediate products. The process utilizes a single catalyst to perform both the selective oxidation and steam dehydrogenation functions. The particular catalyst employed comprises a Group VIII noble metal component, a Group IA and/or a Group IIA component and may contain among other modifiers a Group IIIA or IVA metal, and a halogen component. The catalytic components are supported on an inorganic substrate such as alumina.
Claims24
A process for the steam dehydrogenation of a dehydrogenatable hydrocarbon with oxidative reheating which comprises contacting a C.sub.2 -C.sub.30 dehydrogenatable hydrocarbon, steam, and an oxygen-containing gas in a reaction zone at conditions sufficient to promote both oxidation and dehydrogenation reactions with a catalyst comprising a Group VIII noble metal component, one or more components selected from the group lithium, potassium, rubidium, cesium, and francium, and a component selected from the group consisting of boron, gallium, indium, germanium, tin, and lead, all on an inorganic oxide support, and recovering the products of the reaction.
A process for the steam dehydrogenation of a dehydrogenatable hydrocarbon with oxidative reheating which comprises contacting a C.sub.2 -C.sub.30 dehydrogenatable hydrocarbon, steam, and an oxygen-containing gas in a reaction zone at conditions sufficient to promote both oxidation and dehydrogenation reactions with a catalyst comprising from 0.1 to 10 wt. % platinum or palladium, 0.01 to 20 wt. % potassium, rubidium, or cesium, or a mixture thereof, and a 0.01 to 5.0 wt. % tin on an alumina support having a surface area of from 5 to 120 m.sup.2 /g, and recovering the products of the reaction.
A process for the steam dehydrogenation of a dehydrogenatable hydrocarbon with oxidative reheating which comprises contacting a dehydrogenatable hydrocarbon comprising C.sub.2 -C.sub.15 paraffins and a steam at a steam to hydrocarbon molar ratio of from 0.1:1 to 40:1, at a pressure from 0.1 to 10 atmospheres, a temperature of from 400.degree. to 900.degree. C., and a liquid hourly space velocity (LHSV) of from 0.1 to 100 hr.sup.-1 with a catalyst in the first reaction zone of a reactor containing a plurality of reaction zones and introducing an oxygen-containing gas into the second, and every other reaction zone of the plurality of reaction zones such that the total rate of the oxygen-containing gas introduced into the reaction zone ranges from 0.01 to 2 moles of oxygen per mole of C.sub.2 -C.sub.15 paraffin feed wherein the catalyst is comprised of from 0.1 to 5 wt. % platinum, and from 0.01 to 5 wt. % potassium or cesium or mixtures thereof on an alumina support having a surface area of from 5 to 120 m.sup.2 /g and recovering the products of the reaction.
Dependencies are inferred from the claim text.