摘要:
A method of recharging the reaction tubes of a tube-bundle reactor with a new catalyst fixed bed in which a heterogeneously catalysed partial gas phase oxidation of an organic compound has been carried out in advance in a precursor catalyst fixed bed having Mo-containing multielement oxidative compositions and with formation of a steam-containing product gas mixture, in which, before the recharging, molybdenum oxide and/or molybdenum oxide hydrate-containing solid coating deposited on the tube interior walls is brushed off using a brush.
摘要:
The invention relates to a method for cleaving Michael adducts that are contained in a fluid F at a weight proportion of ≥ 10 wt % and that were formed in the production of acrylic acid or esters thereof, in a cleaving device, which comprises a pump P and a separation column K having installations that effect separation and a recirculation heat exchanger UW, wherein for the purpose of feeding the cleaving energy, the pump P draws sump fluid from the sump chamber of the separation column K and continuously feeds said sump fluid back into the sump chamber above the level of the sump fluid through the recirculation heat exchanger UW, and wherein the pump P is a radial centrifugal pump having an open impeller.
摘要:
A method of recharging the reaction tubes of a tube-bundle reactor with a new catalyst fixed bed in which a heterogeneously catalysed partial gas phase oxidation of an organic compound has been carried out in advance in a precursor catalyst fixed bed having Mo-containing multielement oxidative compositions and with formation of a steam-containing product gas mixture, in which, before the recharging, molybdenum oxide and/or molybdenum oxide hydrate-containing solid coating deposited on the tube interior walls is brushed off using a brush.