Efficient catalytic treatment device for phthalic anhydride tail gas

Abstract

The invention discloses an efficient catalytic treatment device for phthalic anhydride tail gas. The device comprises a pipeline, a preheater, a heat exchanger, a heater, a reaction furnace, a waste heat recovery furnace and a chimney. The device is reasonable in structure, volatile hazardous substances in the tail gas are converted into water and carbon dioxide through a series of catalytic reactions, due to presence of a purified gas inlet of the heat exchanger, the preheater and the heater can be closed after the reactions are performed a period of time, the reactions are promoted by heat produced by the reactions, any extra energy is not required, soft water is converted into water steam by use of hot gas in the waste heat recovery furnace, heat is further utilized, high-temperature water steam can be used for treating secondary heating of the treatment device and can also be used for heat supply to other production lines, no open fire is produced in the reaction process, safe distance requirements are not required, no wastewater or waste residues are produced in the technological process, the operation temperature is low, operation is reliable, energy is saved, the environmentis protected, and the operation efficiency of a factory is improved.

Description

【Technical field】 [0001] The invention relates to the technical field of special equipment for chemical waste gas treatment, in particular to a catalytic and efficient treatment device for phthalic anhydride tail gas. 【Background technique】 [0002] Phthalic anhydride, also known as phthalic anhydride, phthalic anhydride C8H4O3, is a cyclic anhydride formed by intramolecular dehydration of phthalic acid. As an important organic chemical raw material, phthalic anhydride is mainly used in the production of plastic plasticizers, alkyd resins, Dyestuffs, unsaturated resins, and some pharmaceuticals and pesticides. Phthalic anhydride tail gas contains a small amount of phthalic anhydride, maleic anhydride, benzoic acid and trace amounts of unconverted organic compounds and CO. If discharged directly, it will cause serious damage to the environment. Traditional tail gas scrubbing absorbs by-products The purification rate of the fumaric acid process is low, and the process of recyc...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, to provide a kind of phthalic anhydride tail gas catalytic high-efficiency treatment device, which aims to solve the problem of containing a small amount of phthalic anhydride, maleic anhydride, benzoic acid and traces of unconverted organic compounds in the phthalic anhydride tail gas in the prior art And CO, if directly discharged, it will cause serious damage to the environment. The purification rate of the traditional tail gas washing and absorption fumaric acid by-product is low.

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