Continuous oxidation reaction kettle for trimethyl benzene

Abstract

The invention relates to a continuous oxidation reaction kettle for trimethyl benzene, which belongs to the technical field of chemical production equipment. The invention comprises a tower-can shaped reactor kettle body; an agitator is arranged in the upper section of the kettle body, and the top of the kettle body is provided with a gas-phase outlet; the lower section of the kettle body is provided with a heating device, and the bottom of the kettle body is provided with a discharge outlet; the kettle body is provided with at least one step of feed pipes and inlet air pipes, baffle plates which are circuitously distributed up and down at intervals between the at least one step of feed pipes and inlet air pipes, and the baffle plates are provided with honeycomb air vents. By using the method, in the process of reaction, liquid reaction materials drop on the baffle plates from top to bottom and air flows through the honeycomb air vents of the baffle plates from bottom to top, so that the reaction materials are in a boiling status and fully contacted and mixed with the air, thereby effectively improving the oxidation efficiency, and then improving the yield of trimellitic anhydride.

Description

technical field [0001] The invention relates to a continuous oxidation reaction kettle of trimethylene, in particular to an oxidation reaction equipment for producing trimellitic acid through a continuous oxidation process of trimethylene, belonging to the technical field of chemical production equipment. Background technique [0002] Trimellitic acid is an important chemical raw material. As far as the applicant knows, there are two types of methods for generating trimellitic acid through the oxidation reaction of trimellitic acid: batch and continuous. [0003] The oxidation reaction equipment used in the batch type is usually a tower bubble reactor. This type of reactor introduces air at the bottom of the column and exits at the top. Air and reactant materials produce oxidation reaction through natural contact. Its defects are: 1), the air and the reaction material are mixed unevenly, the surface of the air molecule touches the material and can produce an oxidation rea...

AI Technical Summary

Problems solved by technology

Its defects are: 1), the air and the reaction material are mixed unevenly, the surface of the air molecule touches the material and can produce an oxidation reaction, and if it is not in contact, it will form bubbles and flow out from the top of the reactor, so the reaction efficiency is not high, and it is only suitable for low-temperature reaction. 2) It is necessary to repeatedly feed and discharge materials every few hours, increase the pressure and temperature, and reduce the pressure and temperature. Therefore, the metal components of the equipment are prone to fatigue, short service life, high maintenance frequency, and safety. The coefficient is not high, and the environmental protection pressure is high; 3), the energy consumption is high, the material loss is large, and the energy is difficult to recycle.

The obvious disadvantage of this type of equipment is that the equipment investment is large and the process flow is long.

In particular, when the descending liquid trimethylene reaction material meets the ascending air, an oxidation reaction occurs, which is difficult to fully react, and the yield of trimellitic acid is relatively low.

In addition, the connection between each reactor needs to increase pipelines or conveying equipment, which will easily cause problems such as wall formation and blockage of solid materials, making it difficult to operate normally for a long time

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