Reaction device and system and method for synthesizing acetic acid from carbonyl

Abstract

The invention provides a reaction device and a system and a method for synthesizing acetic acid from carbonyl. The reaction device comprises a reaction kettle, a circulating fluid stirring part and a raw material gas distribution stirring part. The gas distribution stirring part comprises more than two gas distribution stirring units, and the more than two gas distribution stirring units are distributed in multiple layers along the central shaft of the reaction kettle and are communicated. A circulating fluid feeding pipe penetrates through a circulating fluid inlet and is communicated with a circulating fluid outlet. A raw material gas feeding pipe penetrates through a raw material gas inlet and is communicated with the gas distribution stirring part. When the reaction device is used for synthesis of acetic acid from carbonyl, a shaft seal and a bottom fixed bearing are prevented from being easily damaged in the operation process during mechanical stirring, there is no movable sealing point, and safe and stable operation of a reaction system is guaranteed. Meanwhile, the more than two gas distribution stirring units which are distributed in multiple layers and are sequentially communicated enable gas in the reaction kettle to be distributed more uniformly, the gas-liquid two-phase mixing effect is improved, the reaction state in the system is optimized, the temperature difference in the reaction kettle is reduced, and side reactions are reduced.

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 oxo-synthesizing 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. Traditional gas-liquid mixing mostly adopts the conventional mechanical stirring mode. The reaction equipment using mechanical stirring can effectively mix liquid-liquid and gas-liquid. However, the shaft seals and bearings required for mechanical transmission are easily damaged during long-term operation. Cause parking maintenance, it is difficult t...

AI Technical Summary

Problems solved by technology

Traditional gas-liquid mixing mostly adopts the conventional mechanical stirring mode. The reaction equipment using mechanical stirring can effectively mix liquid-liquid and gas-liquid. However, the shaft seals and bearings required for mechanical transmission are easily damaged during long-term operation. Cause shutdown maintenance, it is difficult to achieve continuous, stable and safe operation

In recent years, the use of hydraulic agitation has become an important direction for the technical improvement of methanol carbonylation acetic acid plant. At present, the main problems in the use of hydraulic agitation technology are as follows: the single-layer ring distributor has uneven gas distribution, which causes catalyst precipitation; liquid Uneven distribution, resulting in uneven reaction, uneven distribution of temperature field; production capacity decline, etc.

Images