Method for absorbing maleic-anhydride-containing gas by employing dynamic wave absorption tower

Abstract

The invention discloses an absorption technology in the field of production of maleic anhydride. In the traditional technology, by employing the absorption mode of a spraying board type absorption tower, a tower body is excessively huge along with the large scale of the device, the investment is obviously increased, and the equipment processing, transporting and mounting are relatively difficult; the absorption tower is complex in operation, and the strict control and the measurement means are required; and a large amount of cooling water and power are consumed in circulation fluid, so that the device is high in energy consumption, and the operation is not economic. By adoption of the absorption technology of the dynamic wave absorption tower, the mass transfer or the heat transfer is rapidly performed between the maleic anhydride and the absorption solvent or process water in a foam zone, so that the effects of absorbing the maleic anhydride and removing reaction heat are achieved. The equipment investment in the absorption system is effectively reduced, the absorption tower is easy to operate, low in energy consumption, free from tower internal and easy to clean and maintain and is suitable for new construction and technical transformation of a maleic anhydride device through a water absorption method and the solvent absorption method, and the economic benefits of maleic anhydride production are greatly improved.

Description

technical field [0001] The invention relates to a production technology of maleic anhydride, in particular to a method for absorbing maleic anhydride in reaction gas. Background technique [0002] Maleic anhydride is an important organic chemical raw material, and its downstream products have quite broad development and application prospects. It is an indispensable important organic chemical raw material in the development of my country's national economy. [0003] The production method of maleic anhydride is: the raw material benzene or n-butane is oxidized with air, the reaction process is carried out under the action of a certain catalyst, and the reaction gas containing maleic anhydride is obtained, which is obtained through cooling, absorption, refining recovery and other processes. Product maleic anhydride. [0004] Absorbing the reaction gas containing maleic anhydride is one of the key processes in the post-treatment process of maleic anhydride production. Its purpo...

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Problems solved by technology

[0015] 2. In order to ensure that the maleic anhydride is lost as little as possible at the top of the tower, the content of maleic anhydride in the rich solvent sent from the bottom of the tower meets the requirements of proportional control. Dozens of instrument monitoring and control points are set up on the tower. The investment cost of the instrument is high, and the operation Difficulty, a little carelessness, product quality and yield are difficult to guarantee

[0016] 3. In order to improve the mass transfer coefficient and absorption efficiency, the cis-acid aqueous solution or rich solvent at the bottom of the tower is circulated in large quantities through the circulating pump 6 and the circulating cooler 7, and the flow rate of the circulating liquid 8 is usually the sent out cis-acid aqueous solution or rich solvent that has been de-refined and recovered The flow rate is more than 20 times, so it consumes a lot of cooling water and electricity, which makes the device consume more energy and run uneconomically

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