Incinerator for isophthalonitrile tail gas treatment

Abstract

The invention relates to an incinerator for isophthalonitrile tail gas treatment. The incinerator comprises a plurality of parallelly-arranged oxidation beds, supporting grid meshes and heat accumulators, wherein the upper parts of the oxidation beds are connected with one another so as to form a combustion chamber; the supporting grid meshes are arranged at the bottoms of the oxidation beds; ceramic raschig rings are arranged on the supporting grid meshes; the heat accumulators are arranged on the ceramic raschig rings; an isophthalonitrile tail gas inlet pipeline, a flue gas extraction pipeline, a flue gas outlet pipeline and a sweeping pipeline are connected with each oxidation bed; switching valves are arranged on all the above pipelines; a fuel pipeline and a combustion-supporting airpipeline are connected with the combustion chamber; and control valves are arranged on both the above valves. Compared with the prior art, the incinerator provided by the invention has the advantagethat the oxidation rate of ammonia gas and organic waste gas in isophthalonitrile tail gas can exceed 99%.

Description

Technical field [0001] The invention relates to a tail gas treatment device, in particular to an incineration device for isophthalonitrile tail gas treatment. Background technique [0002] At present, the most important method for synthesizing isophthalonitrile is to use meta-xylene under the action of a catalyst to obtain it through ammoxidation reaction with ammonia and oxygen. In the 1950s, Japan's Showa Denko developed the production technology of meta-xylene ammoxidation fixed bed synthesis of isophthalonitrile. In the 1970s, Japan's Mitsubishi Gas Company and Badger Company of the United States jointly developed the fine particle catalyst fluidized bed isophthalonitrile industry. The device improves the production level of isophthalonitrile. The volume content of ammonia in the tail gas component of this process is about 4%, and the content of VOCs organic matter is about 1%. [0003] At present, the treatment of this kind of exhaust gas is mostly carried out in an incinera...

AI Technical Summary

Problems solved by technology

Ordinary RTO devices have certain defects because they are single-bed or double-bed: First, when the gas flow direction is switched, the regenerator that originally enters the isophthalonitrile tail gas immediately becomes the regenerator that discharges the purified gas , so that the gas between the switching valve and the reaction space is directly discharged together with the purified gas without oxidation reaction; secondly, the inlet valve and the outlet valve are started simultaneously in a very short time, which may make the entering isophthalonitrile tail gas Short circuit directly and discharge together with purified gas

There is no purging device, so that part of the exhaust gas in the regenerator cannot be completely oxidized, resulting in a low oxidation rate of the exhaust gas

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