The reactor is a device for realizing the reaction process, which is used to realize the liquid-phase single-phase reaction process and the liquid-liquid, gas-liquid, liquid-solid, gas-liquid-solid and other multi-phase reaction processes. There are often stirring (mechanical stirring, airflow stirring, etc.) devices in the vessel. When the height diameter is relatively large, multi-layer stirring blades can be used. When the materials need to be heated or cooled during the reaction process, a jacket can be set on the wall of the reactor, or a heat exchange surface can be set in the reactor, or heat exchange can be performed through external circulation. Flexible operation, easy to adapt to different operating conditions and product varieties, suitable for the production of small batches, multiple varieties, and long reaction times. The disadvantages of intermittent kettles are: auxiliary operations such as loading and unloading are required, and the product quality is not easy to be stable. However, in some reaction processes, such as some fermentation reactions and polymerization reactions, it is still difficult to achieve continuous production, and batch kettles are still used up to now.

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