Metallgesellschaft Aktiengesellschaft

Rolf Geissen

Volker Franz

Wolfgang Siebert

A mixture will involve a risk of explosion if a concentration limit is exceeded. For this reason only part of the liquid is admixed to the gas in a first mixing zone so that the concentration limit above which there is a risk of explosion will not be exceeded. In a second mixing zone, the remaining quantity of liquid is added to the mixture withdrawn from the first mixing zone and the explosive concentration is exceeded. That mixture, in which the gas and liquid are distributed as homogeneously as possible, is reacted in a reaction zone. The reaction zone directly succeeds the second mixing zone.

Method of mixing a finely divided liquid with a gas to produce a mixture

In a method of periodically heating a product separator of a plant for producing anhydride or maleic anhydride, a PA or MA product is deposited on cooling surfaces of the product separator. To melt the product, the cooling surfaces are indirectly heated by means of a heated liquid, which is circulated through the product separator. The liquid heat transfer medium is indirectly heated with steam in a heater for the heat transfer medium. At least during the time of the largest steam demand, most of that steam is taken from a steam accumulator, which is charged with steam supplied from the plant for producing PA or MA. The charging of the steam accumulator is effected to at least a substantial degree during the time in which the heater for the heat transfer medium is out of operation or is operated under a low load.

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Morfelden-Walldorf, Germany

Rolf Geissen