Polylactic acid polycondensation synthesis equipment and method

Abstract

The invention discloses polylactic acid polycondensation synthesis equipment and method. The equipment comprises a reaction kettle, the bottom of the reaction kettle is connected with three sets of supporting legs, the top of the reaction kettle is connected with a sealing cover, the sealing cover is provided with a detection piece and a feeding piece, and the reaction kettle is provided with a discharging piece; a steam exhaust pipe is mounted on the sealing cover, and the steam outlet end of the steam exhaust pipe is connected with a condensation assembly for collecting and condensing steam in the reaction kettle; and according to the present invention, the design is performed according to the existing requirements, the circular truncated cone can reduce the concentration of the material in the middle of the reaction kettle inner cavity, the material is well contacted and heated with the reaction kettle side wall, the shearing effect of the stirring assembly is small, the fluidity and the mixing degree of the material can be increased, and the disassembly and the assembly are easy, and the water collection assembly can prevent the condensed water on the inner wall of the steam exhaust pipe from dropping in the inner cavity of the reaction kettle. Water is prevented from dropping into the inner cavity of the reaction kettle to influence the condensation polymerization of materials, and effective condensation polymerization synthesis of polylactic acid is facilitated.

Description

technical field [0001] The invention relates to the technical field of polylactic acid production, in particular to a polylactic acid polycondensation synthesis equipment and method. Background technique [0002] Polylactic acid (PLA) is a kind of polyester, which is a polymer obtained by polymerizing lactic acid as the main raw material. PLA is thermoplastic and can be processed by general plastic processing techniques to make films, sheets and fibers. The production of polylactic acid requires the use of polycondensation reactors. [0003] When the existing polycondensation reactor is in use, a plurality of stirring blades are installed in the reactor to stir the materials. However, when the polylactic acid is polycondensed and synthesized, the consistency is high, and the output of the motor needs to be increased, and the output force of the motor is increased. In the process of multiple stirring blades fully stirring the materials, the shearing effect is large, and the ...

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Problems solved by technology

[0003] When the existing polycondensation reactor is in use, a plurality of stirring blades are installed in the reactor to stir the materials. However, when the polylactic acid is polycondensed and synthesized, the consistency is high, and the output of the motor needs to be increased, and the output force of the motor is increased. In the process of multiple stirring blades fully stirring the material, the shearing effect is large, and the material is prone to local mixing and excessive stirring, which leads to uneven reaction of the material when it reacts with the catalyst, which affects the overall polycondensation synthesis effect

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