Reaction device and system and method for synthesizing acetic acid through methanol carbonylation

Abstract

The invention provides a reaction device and a system and a method for synthesizing acetic acid through methanol carbonylation. The reaction device comprises a reaction kettle and a fluid stirring part. The fluid stirring part comprises a reaction raw material distributor and a material return pipe. The reaction kettle comprises a feeding pipe, and the reaction kettle is provided with a feeding hole, a material return outlet and a material return inlet. The reaction raw material distributor is arranged in the reaction kettle. The feeding pipe penetrates through the feeding hole and is connected with the reaction raw material distributor. The material return pipe penetrates through the material return inlet and the material return outlet and is connected with the material return pipe. Whenthe reaction device is used for synthesizing acetic acid through methanol carbonylation, the phenomenon that a shaft seal and a bottom fixing bearing in mechanical stirring are prone to damage in theoperation process is avoided, no dynamic sealing point exists in the whole reaction device, and safe and stable operation of a reaction system is guaranteed. Meanwhile, by matching with the reaction raw material distributor, the raw materials in the reactor are distributed more uniformly, the gas-liquid two-phase mixing effect is improved, the reaction rate is increased, and the internal reactionstate of the system is optimized.

Description

technical field [0001] The invention belongs to the field of chemical industry, and relates to a reaction device, a system and a method for carbonylation of methanol to acetic acid. Background technique [0002] Acetic acid is an important chemical intermediate and solvent for chemical reactions. Among the acetic acid synthesis processes currently in use, the most commonly used one is the methanol low-pressure oxo synthesis process, which was pioneered by the American Monsanto Company in the 1970s. After decades of innovation and development, the device capacity, product quality, and production cost major breakthroughs have been achieved. In terms of process technology improvement, companies are constantly seeking new solutions. Hualu Hengsheng Chemical Co., Ltd. patent CN 201525813 describes that by setting up a methyl iodide circulation tower and an evaporator in front of the rectification unit, the methyl iodide is circulated in the reaction system , reducing the amount...

AI Technical Summary

Problems solved by technology

[0003] At present, most of the technical improvements are in the rectification system, and the reaction system has few changes, especially the reactor unit, which still adopts the conventional mechanical stirring mode for gas-liquid stirring and mixing. The reaction equipment using mechanical stirring can effectively perform liquid-liquid and gas- However, the shaft seals and bearings required for mechanical transmission are easily damaged during long-term operation, resulting in shutdown for maintenance, making it difficult to achieve continuous, stable and safe operation

In recent years, gas-liquid agitation has become an important direction for the technical improvement of methanol carbonylation acetic acid plant, but there are also problems such as poor gas-liquid mixing compared with traditional mechanical agitation reaction devices, and reduced production capacity.

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