Maleic anhydride tail gas treatment equipment and maleic anhydride tail gas treatment process

Abstract

The invention relates to maleic anhydride tail gas treatment equipment, which comprises an air compressor, a maleic anhydride reactor, a gas cooler, a maleic anhydride absorption tower, a burning furnace, a maleic anhydride desorption tower, a lean oil flash evaporation tower, a tail gas washing tower, a gas flow distributor, a moisturizing device, a tail gas deacidification device and a gas-liquid separator, wherein the devices are connected through pipelines, the gas flow distributor comprises an inlet and at least three outlets, the inlet is connected with the tail gas outlet of the maleic anhydride absorption tower, the first outlet is connected with the moisturizing device, the second outlet is connected with the burning furnace, and the third outlet is connected with the tail gas washing tower. The present invention further provides a tail gas treatment process using the treating equipment. Compared with the equipment and the process in the prior art, the equipment and the process of the present invention have the following characteristics that n-butane, maleic anhydride and the maleic anhydride absorption solvent in the tail gas are reused at a maximum. In addition, the condenser with a condensate discharge port is used and the acid organic compounds in the tail gas are eluted by a lot of water vapor carried by the tail gas so as to reduce the equipment investment cost and the produced waste acid water.

Description

technical field [0001] The invention relates to a process for treating maleic anhydride tail gas produced by n-butane oxidation, in particular to a maleic anhydride tail gas deacidification device and a maleic anhydride tail gas treatment process. Background technique [0002] Maleic anhydride is the third largest anhydride after acetic anhydride and phthalic anhydride in the world, widely used in synthetic resins, coatings, pesticides, lubricating oil additives, medicine, paper treatment agents, food additives and stabilizers, etc. Application prospect. Due to many features in the structure, maleic anhydride has strong reactivity, and can be used to synthesize unsaturated polyester resin (UPR), alkyd resin, etc., and to prepare 1,4-butanediol (BDO), tetrahydrofuran (THF) It is a raw material for a series of organic chemistry and fine chemicals, and is one of the important chemical intermediates. In 2013, the domestic production capacity of maleic anhydride reached 1.729 m...

AI Technical Summary

Problems solved by technology

However, due to the large amount of tail gas and acidity, this leads to large deacidification tower equipment and requires corrosion protection. At the same time, the introduction of additional deacidification agent water produces a large amount of acid waste water, and 60% of the tail gas is directly processed without treatment. Combustion not only causes a large amount of unreacted n-butane in the tail gas to not be fully utilized, but also causes solvent loss due to entrainment in the tail gas

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