Process for recharging the reaction tubes of a tube bundle reactor with a new fixed catalyst bed

摘要

A process for recharging the reaction tubes of a tube bundle reactor with a new fixed catalyst bed, in which a heterogeneously catalyzed partial gas phase oxidation of an organic compound had been performed beforehand in a preceding fixed catalyst bed comprising Mo-comprising multielement oxide active compositions to form a steam-comprising product gas mixture, in which, before the recharge, solid deposit which had been deposited on the tube inner walls and comprises molybdenum oxide and/or molybdenum oxide hydrate is brushed away with the aid of a brush.

主权项

1. A process for recharging the reaction tubes of a tube bundle reactor with a new fixed catalyst bed for the purpose of performing a new heterogeneously catalyzed partial gas phase oxidation of an organic starting compound in the new fixed catalyst bed, in which, before the recharge of the reaction tubes of the tube bundle reactor with the new fixed catalyst bed in the same reaction tubes, a heterogeneously catalyzed partial preceding gas phase oxidation of an organic compound has been performed in a preceding fixed catalyst bed which was disposed in the reaction tubes and comprised at least shaped catalyst bodies whose active composition is a multielement oxide comprising the element Mo in the oxidized state to obtain a steam-comprising product gas mixture, and the preceding fixed catalyst bed, after this partial oxidation has ended, has been withdrawn from the reaction tubes, wherein, between the withdrawal of the preceding fixed catalyst bed from the reaction tubes and the recharge of these reaction tubes with the new fixed catalyst bed, at least in some of the reaction tubes, a solid film (solid deposit) which comprises molybdenum oxide and/or molybdenum oxide hydrate and has been deposited on their inner wall is brushed away at least partly with the aid of a brush, and wherein the process does not comprise blasting the reaction tubes.