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AssigneeDynamit Nobel Aktiengesellschaft
InventorsAnton Schoengen, Heinrich Schroeder
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A multi-stage reactor for the oxidation of alkyl aromatics, e.g. a mixture of p-xylene and methyl p-toluate in a liquid phase reaction mixture with oxygen-containing gases, e.g. air, under elevated pressure and at an elevated temperature in the presence of an oxidation catalyst is in the form of an elongated closed tank with a multiplicity of neighboring reaction chambers arranged successively from one end to the other end of the tank for containing the liquid reaction mixture at predetermined levels in each chamber. The reactor is provided with an oxidizing gas feed system for introducing an oxidizing gas into each chamber, feed means for introducing at least one alkyl aromatic reactant and an oxidation catalyst into at least one of the reaction chambers, a vapor-collecting conduit means in communication with each of said chambers for removing reaction gas from each of said chambers, and a discharge means for removing the oxidized product from the reactor tank. An internally disposed cooling conduit system containing a coolant for removing the heat of reaction is provided and includes a group of cooling conduits for each of the reaction chambers. These groups have horizontally disposed cooling conduits through which a cooling medium flows.
A multi-stage reactor for the oxidation of alkyl aromatics, especially mixtures of p-xylene and methyl p-toluate in a liquid phase reaction mixture with oxygen-containing gases under elevated pressure and at an elevated temperature in the presence of an oxidation catalyst, which comprises an elongated closed tank having a multiplicity of reaction chambers arranged successively from one end to the other end of the tank for containing the liquid reaction mixture at predetermined levels in each chamber, an oxidizing gas feed system for introducing an oxygen-containing gas into each chamber, feed means for introducing at least one alkyl aromatic reactant and an oxidation catalyst into at least one of the chambers, a vapor-collecting conduit means in communication with each of said chambers for removing reaction gas from each of said chambers, discharge means for removing the oxidized product from the reactor tank, and an internally disposed cooling conduit system containing a coolant for removing the heat of reaction from said reactor tank including a group of cooling conduits for each of said reaction chambers, said groups comprising horizontally disposed cooling conduits arranged below the level of the liquid reaction mixture and exposed to transverse flow of the oxygen-containing gas through each of the reaction chambers.
A multi-stage reactor for effecting the oxidation of alkyl aromatics in a liquid phase reaction mixture with oxygen-containing gases under elevated pressure and at elevated temperature in the presence of an oxidation catalyst which comprises an elongated tank having a plurality of successively-arranged liquid-containing chambers within said tank, means for feeding at least one alkyl aromatic reactant into at least the first chamber of the successively-arranged chambers, means for feeding an oxidation catalyst into at least the first chamber of the successively arranged chambers, oxidizing gas feed means for introducing a molecular oxygen-containing gas into each of said chambers below the liquid level therein, horizontally disposed cooling conduit means for removing the heat of reaction from said liquid phase reaction mixture, said cooling conduit means being arranged below the liquid phase reaction mixture within each of the liquid-containing chambers so that the oxygen-containing gas introduced into the chamber passes over the cooling means in a direction transverse to the direction of coolant in said cooling means, before exiting from the liquid phase, liquid-level control means for maintaining the liquid level in each of said chambers at a predetermined level, and discharge means for removing the reaction products from the reactor.
Dependencies are inferred from the claim text.