Oxidation reactor for producing polybasic carboxylic acid

Abstract

The invention relates to an oxidating reactor for producing polybasic carboxylic acids. A flow gudie cylinder is arranged in a cylindrical stand pressure container, and two layers of mixing devices are axially arranged. The pressure container is internally provided with a baffle and liquid and air inlet nozzles, wherein, the flow guide cylinder has an upper layer and a lower layer. The surface of the upper layer cylinder is provided with holes with certain shape, and the lower end surface has a tapered expansion. The invention adopts the optimized and combined dual-layer flow guide cylinder mixing devices. Under the co-action of a mixing impeller and the flow guide cylinder, the materials of the oxidation reaction disperse rapidly to distribute the methyl aromatic hydrocarbon entering the container evenly in the solvent, and quickly react with the oxygen, and then the heat is rapidly transmitted out through even mixing and dispersing, so as to make the internal temperature of the container even, satisfy the technical requirements of oxidation and reduce the possibility of aggravated side reaction caused by partial high temperature.

Description

technical field [0001] The invention relates to a reactor used in petrochemical production, in particular to an oxidation reactor for the production of polycarboxylic acids. The equipment is suitable for the production process of the liquid-phase oxidation of methyl aromatics by air, especially oxygen-enriched air. The equipment can improve the utilization rate of oxygen in the oxidation process, improve the conversion rate, selectivity and yield of the oxidation reaction, and improve the quality of the oxidation reaction product. Background technique [0002] The industrial liquid-phase oxidation method to produce polycarboxylic acids basically uses acetic acid as a solvent, cobalt / manganese / bromine as a catalyst, and uses air to carry out liquid-phase oxidation of methyl aromatics. The oxidation process usually uses a stirred tank or a bubble tower form. [0003] In the liquid-phase oxidation of methyl aromatics, due to the difference in the degree of difficulty in the ox...

AI Technical Summary

Problems solved by technology

The feature of this agitator is to strengthen the axial mixing, restrain the tangential movement of the substance system, eliminate the dead zone and high shear turbulent zone in the kettle, and the combination of the propeller and the scraping blade eliminates the stagnant layer of the highly viscous object, It is suitable for occasions where the viscosity changes greatly during the system reaction process, but cannot be applied to the production of polycarboxylic acids

Images