Patent DE-102013000647-A1 (DE)
Title: Providing reactor system for producing phthalic acid anhydride by gas phase oxidation of aromatic hydrocarbons on catalyst, comprises e.g. providing tubular reactor, and providing catalyst phase formed from catalyst in the tubes
Inventor: WÖLK HANS-JÖRG DR
IPC: C07D307/89
Filed: 2013-01-16
Abstract: Providing a reactor system for producing phthalic acid anhydride by gas phase oxidation of aromatic hydrocarbons on at least one catalyst (A(m, n)), comprises (i) providing a tubular reactor, (ii) providing a catalyst phase formed from the catalyst (A(m, n)) in the tubes, (iii) supplying a reaction gas forming a gas phase through the tubes, (iv) providing a model, (v) determining operating conditions of the tubular reactor, (vi) providing a catalyst (A(m, G)) from the intrinsic difference, and providing a catalyst phase comprising catalyst (A(m, G)) in the tubes of the reactor. Providing a reactor system for producing phthalic acid anhydride by gas phase oxidation of aromatic hydrocarbons on at least one catalyst (A(m, n)) comprising catalyst bodies containing active material, comprises (i) providing a tubular reactor with a number of tubes exhibiting a diameter and a tube length, (ii) providing a catalyst phase formed from the catalyst (A(m, n)) in the tubes, (iii) supplying a reaction gas forming a gas phase through the tubes, (iv) providing a model, which describes a heat balance for the tubular reactor for the gas phase and the catalyst phase in the tubes of the tubular reactor, material balance for each gas phase and the catalyst phase, material transfer in the catalyst body and reaction kinetics for producing phthalic acid anhydride by gas-phase oxidation of aromatic hydrocarbons, (v) determining operating conditions of the tubular reactor by adjusting at least one predetermined flow rate of the reaction gas per tube, a predetermined concentration of at least one reaction component in the reaction gas, and a predetermined average coolant temperature of the refrigerant, determining a performance characteristic, which has Wn values, and determining a difference with the model, (vi) providing a catalyst (A(m, G)) from the intrinsic difference, and providing a catalyst phase comprising catalyst (A(m, G)) in the tubes of the reactor. The catalyst (A(m, n)) exhibits at least one catalyst parameter. The tubes exhibit a tube wall, which circulates around by a coolant having an average coolant temperature. The catalyst phase comprises at least one layer (Lm) of the catalyst (A(m, n)), in which m is 1and is the maximum number of the layers, and n is 1 to n, which denotes the catalyst (A(m, n)). The reaction gas comprises at least one reaction component. The step of determining the difference with the model comprises (a) assigning the intrinsic difference with a value, (b) determining a first value (W1) of the performance characteristic for a first catalyst (A(m, 1)) under the operating conditions of the tubular reactor, (c) changing at least one parameter of the first catalyst (A(m, 1)) for forming a second catalyst (A(m, 2)), (d) determining a second value (W2) of the performance characteristic with the model for the second catalyst (A(m, 2)) under the operating conditions of the tubular reactor, (e) comparing the first value and the second value and determining the difference, and (f) repeating the steps (b) to (e) with the catalyst (A(m, n)) until the difference is lower than the intrinsic difference.