Control method for gas-phase oxidation reactor for the production of phthalic anhydride

摘要

A method for controlling a gas-phase oxidation reactor for producing phthalic anhydride by passing the reaction tubes of a large number arranged in gas-phase oxidation reactor a gas stream comprising molecular oxygen and aromatic hydrocarbons, the reaction tube wherein the catalyst bed at least one each of is, can be controlled its temperature by using a heat transfer medium and the one control parameter is measured, at least, corrective interventions for the control of the control parameters determined and is, include phthalic anhydride yield is at least one control parameter, the correction parameters to be used and the temperature of the heat transfer medium. Over at least 90% of the catalyst life, the change of the correction parameters are limited to a maximum value of 0.5K in the period of 30 days. In this way, phthalic anhydride yield that accumulated over catalyst life is maximized. None [Figure] selection.