Oxidation reaction temperature regulation control device and method in fixed bed maleic anhydride production with normal butane method

Abstract

The invention relates to an oxidation reaction temperature regulation control device and method in fixed bed maleic anhydride production with a normal butane method. A slide valve is arranged between a reactor and a molten salt cooler; a high-temperature molten salt inlet of the slide valve is connected with a molten salt lower circuit of the reactor; a high-temperature molten salt outlet is connected with a high-temperature molten salt inlet of the molten salt cooler; and a low-temperature molten salt returning port and a molten salt backflow port are connected with a molten salt upper circuit of the molten salt cooler and the reactor. An expansion joint is arranged at the center of the slide valve; in a valve body, a connecting rod is connected with a valve core and a self-control electric execution mechanism on the valve body; and a through hole corresponding to the valve core is arranged on the valve seat. By adopting the method, automatic regulation control on the temperature of molten salt is realized; and by accurately controlling the opening of the slide valve, stable temperature of the molten salt on the shell pass of the reactor is realized, and the fluctuation of the reaction temperature is solved and overcome. The molten salt temperature of the reactor is correct to + / -0.5 DEG C from the (+ / -)2-3 DEG C under original control. The yield of the maleic anhydride obtained by the oxidation reaction is improved by 0.5-1.0% by weight, and the byproduct in the reaction products is reduced.

Description

technical field [0001] The invention relates to the technical field of maleic anhydride (maleic anhydride) production, in particular to a method for controlling and adjusting the temperature of molten salt by fixed-bed oxidation reaction. Background technique [0002] Maleic anhydride is a commonly used basic and important organic chemical raw material. It is the second largest acid anhydride raw material after phthalic anhydride in the world, and its downstream products have quite broad development and application prospects. Maleic anhydride is widely used in synthetic resins, lubricating oil additives, pharmaceuticals, food additives, 1,4-butanediol (BDO), γ-butyrolactone (GLB), tetrahydrofuran (THF), succinic acid, fumaric acid, etc. A range of important organic and fine chemicals. [0003] The core of maleic anhydride production technology is the high-temperature exothermic, gas-solid phase catalytic oxidation reaction of raw materials and air in a fixed-bed reactor. ...

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Problems solved by technology

A small change in the temperature of the molten salt will cause a large change in the reaction temperature, thus affecting the change in conversion and selectivity, and finally affecting the yield of maleic anhydride

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