Shell catalyst for producing acetic acid by gas phase oxidation of unsaturated C4 -hydrocarbons
AssigneeConsortium fur Elektrochemische Industrie GmbH
InventorsChristoph Ruedinger, Hans-Juergen Eberle, Norbert Zeitler, Max Wollin, Gudrun Wittmann
Life of this patent
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Abstract
The invention relates to a shell catalyst for producing acetic acid by gas-phase oxidation of unsaturated C4-hydrocarbons, comprising an inert non-porous carrier and a catalytically active mixed oxide material applied on the outer surface of the carrier, wherein said material contains (a) one or several oxides from the group titanium dioxide, zircon dioxide, stannic dioxide, aluminum oxide, and b) 0.1 to 1.5 wt. % vanadium pentoxide in relation to the weight of the constituent (a) and per m2/g of the specific surface of the constituent (a).
Claims8
Coated catalyst for preparing acetic acid by gas-phase oxidation of unsaturated C4-hydrocarbons comprising
- an inert nonporous support body and a catalytically active mixed-oxide composition which is applied to an outer surface of the support body and contains
- a) at least one oxide selected from the group consisting of titanium dioxide, zirconium dioxide, tin dioxide, and aluminum oxide;
- and
- b) from 0.1% to 1.5% by weight, based on the weight of the component a) and per m2/g of specific surface area of the component a), of vanadium pentoxide.
Process for preparing acetic acid by gas-phase oxidation of unsaturated C4-hydrocarbons in a tube reactor comprising
- using a coated catalyst which comprises an inert nonporous support body and a catalytically active mixed oxide composition which is applied to an outer surface of the support body and contains
- a) at least one oxide selected from the group consisting of titanium dioxide, zirconium dioxide, tin dioxide, and aluminum oxide;
- and
- b) from 0.1% to 1.5% by weight, based on the weight of the component a) and per m2/g of specific surface area of the component a), of vanadium pentoxide;
- and
- reacting a gas mixture containing oxygen or oxygen-containing gas, one or more C4-hydrocarbons and water vapour and having a volume mixing ratio of butene (mixture)/oxygen (air) of from 0.2/99.5 to 15/85 and a volume mixing ratio of butene (mixture)/water vapour of from 1/1 to 1/50 by contacting the coated catalyst at a temperature of from 100° C. to 400° C. and a gauge pressure of from 0.2 to 30 bar.
Coated catalyst for preparing acetic acid by gas-phase oxidation of unsaturated C4-hydrocarbons comprising
- an inert nonporous support body and a catalytically active mixed oxide composition which is applied to an outer surface of the support body and contains
- (a) at least one oxide selected from the group consisting of titanium dioxide, zirconium dioxide, tin dioxide, and aluminum oxide;
- and
- wherein component (a) additionally contains at least one oxide of a metal selected from the group consisting of hafnium, niobium, lanthanum and cerium in an amount of from 1% to 15% by weight, based on the total weight of the component (a);
- and
- (b) from 0.1% to 1.5% by weight, based on the weight of the component (a) of vanadium pentoxide;
- and
- wherein component (b) additionally has part of the vanadium pentoxide being replaced by at least one oxide of a metal selected from the group consisting of molybdenum, chromium, antimony, at least one oxide of an alkali metal, elements of main group groups V and VI of the Periodic Table of the Elements, and a transition metal which is present as an additional component (b).
Dependencies are inferred from the claim text.