A kind of esterification polymerization reaction system

Abstract

The invention relates to an esterification and polymerization reaction system. The esterification and polymerization reaction system comprises an esterification pre-polycondensation reactor and a polymerization reactor. A pre-polycondensation discharging opening of the esterification pre-polycondensation reactor is connected with a pre-polycondensation discharging pipe through a pre-polycondensation liquid level control valve or a melt conveying pump, and the pre-polycondensation discharging pipe is connected with a pre-polycondensation feeding opening of the polymerization reactor. The esterification pre-polycondensation reactor is internally partitioned into an upper esterification chamber and a lower polycondensation chamber through an arc partition plate, a material inlet and a gas phase outlet of the upper esterification chamber are formed in the top of the upper esterification chamber, the center of the bottom of the arc partition plate is provided with a nitrogen gas inlet, and the side wall of the upper esterification chamber is provided with an esterified material outlet; the bottom of the lower polycondensation chamber is connected with an esterified material preheater, the esterified material outlet is connected with a preheater feeding opening through an esterification liquid level control valve and an esterified material discharging pipe, and the esterified material discharging pipe is connected with an auxiliary inlet; an inner cavity of the lower polycondensation chamber is provided with multiple layers of trays from bottom to top. The esterification and polymerization reaction system is compact in structure, small in occupied area and high in production efficiency.

Description

technical field [0001] The invention relates to an esterification polymerization reaction system, which belongs to the technical field of polyester production. Background technique [0002] In the prior art, the esterification reaction and polycondensation reaction during polyester production are generally carried out in independent reaction towers or reactors, such as the Chinese invention patent with publication number CN101618304B, which discloses an esterification reactor composed of multiple Each tray is composed of a downcomer and a gas riser. The gas riser is connected to a rotatable gas distributor, and the gas distributor is composed of an induction pipe, a fan and a nozzle. Each tray retains a certain level of liquid with a solid catalyst in the liquid. The liquid phase is the component containing carboxylic acid, which flows down from one esterification tray to the next tray in the reactor, and countercurrently reacts with the rising alcohol vapor. [0003] The ...

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Problems solved by technology

[0006] After the PET melt enters the inner cavity of the polymerization reactor, the heated area is relatively small, and only one polymerization reaction is carried out, the reaction speed is slow, and the production efficiency is low; the small molecules produced by the reaction are easy to carbonize on the wall of the kettle, fall into the material, and produce Black spot material, often need to stop and wash the kettle, the product quality is unstable, and the operation cycle is short

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