Chloroacetic acid production method and chlorination reactor

The invention provides a chloroacetic acid production method and a chlorination reactor. The chloroacetic acid production method comprises the following steps: primarily mixing acetic acid, liquid chlorine and acetic anhydride according to a ratio, feeding a mixture obtained from the former step into the chlorination reactor, keeping a certain reaction temperature and a certain reaction pressure, completing chlorination reaction in a gravity field of 100-1000g, and performing separation purification on the product by using a continuous method production process after the reaction is completed, thereby obtaining a product finally. The chlorination reactor mainly comprises a reaction kettle, a cooling half-tube, a supergravity bucket, a driving motor and a mixer. By adopting the chloroacetic acid production method and the chlorination reactor provided by the invention, the macroscopic and microcosmic distribution of components in a reaction system can be improved, the side effect is reduced, the internal mass transfer velocity of the liquid phase is reduced, the separation of the gas phase and the liquid phase is improved, the chlorination reaction velocity is increased, the reaction retention time is shortened, the heat radiation effect is improved, and the treatment capacity is much higher than that of a conventional method, and the chloroacetic acid production method is particularly applicable to a large-size chloroacetic acid device.