JPS5762237A - Preparation of anthraquinone - Google Patents

Abstract

PURPOSE: To prepare the titled compound, economically, by the moving bed catalytic reaction of benzene with a mixture of phthalic anhydride and an inert gas at a high temperature, controlling the reaction temperature by the indirect heat exchange between hot raw material gas and the catalyst layer, and maintaining uniform gas distribution.

CONSTITUTION: Hot raw material gas containing benzene, phthalic anhydride and inert gas such as N₂, CO₂, etc. is introduced into the tubular moving bed reactor 1 through its inlet 2, passed through the path formed by the tubes 3 and the baffle plates 4, subjected to the heat exchange with the catalyst layer 5 in the tube through the tube walls, and sent to the gas distributing chamber 8 through the outlet 6 and the inlet 7. the catalyst fed to the reactor 1 through the top, passes the distributor 12, forms a layer 14 on the distribution plate 13, and descends in the tubes 3 by its own weight forming a plurality of catalyst layers 5 each having equal length and flow resistance. The raw material gas is introduced into the catalyst layers 5 from the distribution chamber 8 and the gas-inlet zone 9 having a slit and placed in the tube, and uniformly distributed among the layers. The reaction product obtained by the catalytic reaction is taken out of the reactor.

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