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Preparation of phthalic anhydride by gas phase oxidation of O-xylene in a main reactor and postreactor
Preparation of phthalic anhydride by gas phase oxidation of O-xylene in a main reactor and postreactor
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机译:在主反应器和后反应器中通过邻二甲苯气相氧化制备邻苯二甲酸酐
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摘要
A process is described for preparing phthalic anhydride by catalytic gas phase oxidation of o-xylene, in which a gaseous mixture of o-xylene and an oxygenous gas is converted in a main reactor to a gaseous intermediate reaction product which comprises unconverted o-xylene, phthalic anhydride underoxidation products and phthalic anhydride, the heat of reaction which arises in the main reactor being removed at least partly by indirect cooling with a heat carrier medium, and the intermediate reaction product being introduced into a postreactor. The concentration of unconverted o-xylene in the intermediate reaction product is at least 1% by weight, and the sum of the concentrations of phthalic anhydride underoxidation products in the intermediate reaction product is at least 0.5% by weight. The process allows an increase in the overall yield of phthalic anhydride without or without significant deterioration in the product quality.
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