Production device and production method for synthesizing acetic acid by low-pressure carbonylation of methanol

Abstract

The invention discloses a production device and a production method for synthesizing acetic acid by low-pressure carbonylation of methanol. A fluid stirring device arranged on the production device provided by the invention changes the situation that a mechanical stirring shaft seal and a transmission device are easy to damage in an operation process, eliminates dynamic seal points, and greatly improves the safe and stable operation of a system. At the same time, by matching with a CO distributor, the CO gas distribution in a reactor is more uniform, the gas-liquid two-phase mixing effect is improved, the reaction rate is increased, the reaction state of the system is optimized, and the production capacity of the device is increased from 300,000 tons per year to 600,000 tons per year.

Description

technical field [0001] The invention relates to the field of acetic acid synthesis, in particular to a production device and production method for synthesizing acetic acid by methanol low-pressure carbonylation. Background technique [0002] Acetic acid is an important chemical intermediate and a solvent for chemical reactions. Among the currently used acetic acid synthesis processes, the most commonly used one is the methanol low-pressure oxo synthesis process. This process was pioneered by the U.S. Monsanto Company in the 1970s. After years of innovation and development, the production process has undergone tremendous changes, and major breakthroughs have been made in device capacity, product quality, and production costs. [0003] In terms of process technology improvement, companies are constantly looking for new solutions, as described in the patent CN 101665424 of Beijing Zehua Chemical Engineering Co., Ltd., which combines the existing functions performed by the light...

AI Technical Summary

Problems solved by technology

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

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