Kettle type polymerization reactor

Abstract

A kettle type polymerization reactor disclosed in the invention comprises a reactor main body, a driving motor is installed at the top of the reactor main body, the output shaft of the driving motor is connected with a stirrer located in the reactor main body, and the stirrer comprises a central longitudinal shaft, an eccentric side rod and an eccentric main shaft which are connected in sequence; one end of the central longitudinal shaft is connected with the output shaft of the driving motor, the other end of the central longitudinal shaft is fixedly connected with the eccentric side rod, the eccentric side rod is connected with the eccentric main shaft through a bearing, a gear is arranged on the eccentric main shaft, and a circle of rack meshed with the gear is arranged on the inner wall of the reactor main body; and an upper spiral blade and a lower spiral blade which are opposite in spiral direction are fixed on the eccentric main shaft. The kettle type polymerization reactor disclosed by the invention can effectively shorten the gas-liquid two-phase mixing time, enhance the mixing effect, improve the reaction efficiency and save the energy consumption, and is particularly suitable for the gas-liquid interface reaction with higher viscosity.

Description

technical field [0001] The invention relates to the technical field of chemical reaction equipment, in particular to a tank-type polymerization reactor. Background technique [0002] The control mechanism of heterogeneous chemical reactions can be divided into reaction control and mass transfer control. For fast reactions, interphase mass transfer is the controlling step. The phosgene interfacial polycondensation method is a commonly used polycarbonate (Polycarbonate, PC) production method in industry. Polymerization reaction occurs on the interface under the action of catalyst to form polycarbonate. The polymerization reaction can generally be divided into two stages: phosgenation and polycondensation. The former is phenol sodium salt formed by dissolving bisphenol A in alkaline aqueous solution and phosgene undergoes acyl chloride reaction to form oligomers with only tens or hundreds of molecular weights. The latter is further polycondensation of oligomers to generate h...

AI Technical Summary

Problems solved by technology

When the molecular weight distribution in the polycarbonate product is wide and the small molecular weight content is high, its initial decomposition temperature will decrease, and the product stability will deteriorate.

[0004] The existing polymerization kettle used in industry is a common reactor with stirring. In order to enhance the mass transfer effect, the existing methods are all by adding similar baffles or baffle parts. The mixing effect of this method is not ideal. There will be a dead angle of stirring; and because the solution formed by the polycarbonate produced by the polymerization reaction in the organic solvent has a relatively high viscosity, the hard stirring of the baffle and the baffle will cause damage, and it is not suitable to use this method to enhance the mass transfer effect

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