Reaction device for interesterification and polycondensation reaction

Abstract

The invention provides a reaction device for transesterification and polycondensation, which comprises a kettle 2 with a reactor lid 5, a central axis 14 which is hollow, a heating apparatus and a stirring part connecting with the central axis 14. The stirring part comprises an upper inversed anchor 4 and a lower inversed anchor 3 connecting with the hollow axis 14. The reaction device of the invention can ensure that the transesterification and the polycondensation are carried out at the same time in one reactor, thus being applicable to large scale production and solving the problem of difficult material discharging. By adopting the invention, the polycondensed molecule weight distribution is narrow and the size of the molecule weight is even.

Description

technical field [0001] The invention relates to a reaction device, in particular to a reaction device integrating transesterification reaction and polycondensation reaction. Background technique [0002] Polyphenylene is a high-polymerization-degree hydroxybenzoic acid-based high-temperature-resistant polyester resin. Its full name in Chinese is polyparaben, abbreviated as POB. It is synthesized based on p-hydroxybenzoic acid and its derivatives. [0003] As early as 1910, E. Fisher prepared tetramer with p-hydroxybenzoic acid. Since then, a lot of research work has been carried out. Until 1969, American emery company J.Economy and others used phenyl p-hydroxybenzoate as a monomer to prepare a polymer with a number average molecular weight of about 10,000 and could be molded and processed. In 1970, a 227t The device of / a was put into production, and the trade name was Ekonol. In 1979, Japan's Sumitomo Chemical Company imported technology from the United States to build ...

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Problems solved by technology

[0007] The prior art is only suitable for the exploration of process conditions and the preparation of samples in the laboratory, for example: CN1597730 A discloses a column extending downward in the center of the bottom of the experimental device, and an inverted T-shaped plug is inserted. In the large-scale production of industrial devices, one is that the material is at a high temperature of 384°C, and the other is that the condensate is easy to separate from the solvent, so that the material is deposited and blocked, and the material cannot be discharged.

Even dismantling the plug (dangerous operation) cannot prevent the high temperature oxidation of the condensate and affect the product quality

[0008] Moreover, the electric heating system in CN1597730 A directly heats the outer wall of the reaction kettle by covering the electric furnace core with the insulation cover. This structure heats unevenly and is easy to overheat.

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