Patent DE-102013000648-A1 (DE)
Title: Providing reactor system for preparing phthalic anhydride, involves performing gas phase oxidation of aromatic hydrocarbons at catalyst, and providing a tube bundle reactor with a number of tubes having diameter, tube length and tube wall
Inventor: WÖLK HANS-JÖRG DR
IPC: C07D307/89
Filed: 2013-01-16
Abstract: Providing a reactor system for preparing phthalic anhydride, comprises: performing a gas phase oxidation of aromatic hydrocarbons at at least one catalyst (A m , n) comprising a catalyst body containing a vanadium-containing active material; providing a tube bundle reactor with a number b of tubes, which have a diameter (D), a tube length (L), and a tube wall; providing a catalyst phase in the tubes of at least one layer (L m); and feeding a reaction gas forming a gas phase through the tubes, where the reaction gas contains at least one reaction component. Providing a reactor system for preparing phthalic anhydride, comprises: performing a gas phase oxidation of aromatic hydrocarbons at at least one catalyst (A m , n) comprising a catalyst body containing a vanadium-containing active material; providing a tube bundle reactor with a number b of tubes, which have a diameter (D), a tube length (L), and a tube wall, which is flowed around by a coolant having an average coolant temperature (T k); providing a catalyst phase in the tubes of at least one layer (L m), where the layer (L m) is provided by the catalyst (A m , n), where m is an integer of 1 and assumes the maximum number of layer, n is an index of 1-n that identifies a specific catalyst, and an active mass loading (M m, n) is provided in the layer (L m) of the catalyst (A m , n); feeding a reaction gas forming a gas phase through the tubes, where the reaction gas contains at least one reaction component; providing a model for the tube bundle reactor for the gas phase and the catalyst phase in the tubes of the tube bundle reactor; describing a heat balance and a material balance for each of the gas phase and the catalyst phase, a mass transfer in a catalyst body, and reaction kinetics for the production of phthalic anhydride by gas phase oxidation of aromatic hydrocarbons; determining operating conditions of the tube bundle reactor in which at least one certain flow of the reaction gas per tube, a predetermined concentration of the reaction component in the reaction gas and a certain average coolant temperature (T k) of the refrigerant are adjusted; determining a performance feature, which accepts values (W n); determining a difference (delta ) with the model in which (a) an intrinsic difference (delta G) of a value is assigned, (b) a first active material loading (M m, 1) in the layer (L m) with a first catalyst (A m, 1) is provided and a first value (W 1) of the performance feature is determined under the operating conditions of the tube bundle reactor, (c) the active mass loading of the layer (L m) is changed in which a second active mass loading (M m, 2) is provided by a second catalyst (A m, 2), (d) a second value (W 2) of the performance feature is determined with the model for the second catalyst (A m, 2) under the operating conditions of the tube bundle reactor, and (e) the first and second values are compared and the difference (delta ) is determined, where the steps (B)-(E) are repeated with the catalysts (A m , n) until the difference (delta ) of amount below the marginal difference (delta G); providing a catalyst (A m, g) value determined from the intrinsic difference (delta G); and providing the layer (L m) of the catalyst phase formed from the catalyst (A m, g) in the tubes of the reactor.