Method for producing a catalyst arrangement for the production of phthalic anhydride
AssigneeSud-Chemie IP GmbH & Co. KG
InventorsHans-Jörg Wölk, Gerhard Mestl
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Abstract
A method for producing phthalic anhydride by catalytic gas-phase oxidation of o-xylene and/or naphthalene, carried out by means of a catalyst arrangement which has a first catalyst layer at the gas inlet side and at least one second catalyst layer after the first catalyst layer in the gas flow direction with different catalytic activity, wherein when the gas-phase oxidation is being carried out a lower maximum temperature is formed in the first catalyst layer than in the second catalyst layer. Furthermore, a method for producing the catalyst arrangement, as well as the catalyst arrangement itself.
Claims54
A method for producing/optimizing a catalyst arrangement for the gas-phase oxidation of hydrocarbons comprising the arrangement of a first catalyst layer of length L1 and at least one second catalyst layer of length L2, each with different catalytic activities with respect to the gas-phase oxidation of hydrocarbons, wherein the first catalyst layer is arranged at the gas inlet side for a reaction gas and the at least one second catalyst layer is arranged following the first catalyst layer in the gas flow direction, wherein the catalyst arrangement has a temperature profile during the gas-phase oxidation of hydrocarbons which increases from the first catalyst layer to the second.
A method for producing phthalic anhydride by catalytic gas-phase oxidation of o-xylene and/or naphthalene, wherein the method is carried out by means of a catalyst arrangement which has a first catalyst layer at the gas inlet side and at least one second catalyst layer after the first catalyst layer in the gas flow direction with different catalytic activities, wherein when the gas-phase oxidation is being carried out a lower maximum temperature (hotspot temperature) is formed in the first catalyst layer than in the second catalyst layer.
A catalyst comprising a first catalyst layer K1 of length L1 and at least one second catalyst layer K2 of length L2, each with different catalytic activities with respect to the gas-phase oxidation of hydrocarbons, wherein the first catalyst layer K1 and the at least one second catalyst layer K2 together form a catalyst layer K with the total length L1+L2 and wherein the first catalyst layer K1 is arranged at the gas inlet side for a reaction gas and the second catalyst layer K2 is arranged after the first catalyst layer K1 in the gas flow direction, wherein the catalyst has a temperature profile which increases during the gas-phase oxidation of hydrocarbons from the first catalyst layer to the second.
Dependencies are inferred from the claim text.