Stirring kettle for preparing tetrabromobisphenol A

Abstract

The invention discloses a stirring kettle for preparing tetrabromobisphenol A, and relates to the technical field of stirring kettles. The stirring kettle comprises a stirring kettle body, a cover plate installed at the top of the stirring kettle body and a discharging mechanism installed at the bottom of the stirring kettle body, a plurality of feeding pipes are installed on the cover plate, a lifting mechanism is fixed to the top of the cover plate, a transmission mechanism is rotatably mounted at the lifting end of the lifting mechanism, one side of the transmission mechanism is in transmission connection with a driving mechanism, and the bottom end of the transmission mechanism penetrates through the inner wall of the bottom of the cover plate and is in transmission connection with a stirring shaft; a plurality of groups of stirring mechanisms which are distributed at equal intervals are mounted on the circumferential outer wall of the stirring shaft, and three stirring mechanisms form one group and are distributed circumferentially. The motion resistance between the stirring pipe and the reaction liquid can be increased, so that the rotating speed of the stirring shaft can be rapidly reduced, the transmission resistance is reduced when the motor is restarted to carry out anticlockwise driving work of the stirring shaft, and the motor is protected.

Description

technical field [0001] The invention relates to the technical field of stirred tanks, in particular to a stirred tank used for preparing tetrabromobisphenol A. Background technique [0002] Tetrabromobisphenol A is a derivative of bisphenol A. It is a white powder and is mainly used as an additive for plastic products. It is one of the commonly used brominated flame retardants. Tetrabromobisphenol A is produced by bromination of bisphenol A. According to different reaction conditions, it can be divided into direct bromination method, catalytic bromination method, oxidative bromination method, etc. Oxidative bromination method is one of the most commonly used preparation methods. This method is carried out in a solvent in the presence of hydrogen peroxide. Add bisphenol A, n-octanol and water into the stirred tank, stir, control the temperature at 25°C, add bromine dropwise within 45 minutes, add hydrogen peroxide, and keep warm for 10 minutes. Raise the temperature to 80...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a stirred tank for the preparation of tetrabromobisphenol A, to solve the problem that the opposite meshing force between the forward half gear and the reverse bevel gear in the forward and reverse switching state in the prior art is too large, if The technical problem of not slowing down the stirring components, or causing structural damage or even the extreme speed braking of the stirring motor

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