Hybrid polyester esterification reactor

Abstract

The invention relates to a hybrid polyester esterification reactor, comprising a heating reaction tank and an evaporating reaction tank. The reactor also comprises a dynamic hybrid section, wherein the outlet of the heating reaction tank is communicated with the inlet of the evaporating reaction tank; the dynamic hybrid section is provided with a venturi tube and a power pump matched with the venturi tube; the inlet and the outlet of the dynamic hybrid section are respectively connected with the outlet of the evaporating reaction tank and the inlet of the heating reaction tank so as to form a circulating channel for materials; the venturi tube is provided with a suction inlet for introducing fresh slurry. The reactor utilizes the characteristics that the venturi tube sucks the serum while hybriding the slurry so as to effectively improve the hybrid effect, and is combined with the power pump and the heating power so as to effectively form circulation of the slurry, so that the whole structure of the reactor is simpler, and the operation is more convenient, the materials can be hybrided more evenly, and the esterification reaction can be more convenient. The reactor is mainly used for the esterification reaction process for the polyester.

Description

technical field [0001] The invention relates to a hybrid polyester esterification reactor, mainly relating to the technical field of producing polyethylene terephthalate (PET, commonly known as polyester). Background technique [0002] The production of polyester is to mix the esterification reaction raw materials ethylene glycol (EG) and terephthalic acid (PTA) in a certain ratio in the esterification reactor, add appropriate temperature and pressure conditions, and keep enough time to complete the esterification process. Chemical reaction to generate ethylene terephthalate (BHET), and then further polycondensate the generated ethylene phthalate to generate polyethylene terephthalate. The esterification process is generally completed in a fully mixed tank with agitation. The disadvantage of this esterification reactor with agitator is that the structure is complex and the mixing effect is not ideal. [0003] In response to this problem, there are currently also reactors th...

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Problems solved by technology

The esterification process is generally completed in a fully mixed tank with agitation. The disadvantage of this esterification reactor with agitator is that the structure is complex and the mixing effect is not ideal.

[0003] In response to this problem, there are currently also reactors that rely on the combination of thermodynamic circulation and external dynamic stirring circulation. In a circulation system, this reactor is equipped with an agitator at the outlet of the evaporation reaction zone for material transportation, and at the same time The circulation of materials in the overall system is realized by using the thermal cycle power of the heating reaction zone, although in this way the esterification reaction can be carried out at a molar ratio of ethylene glycol / terephthalic acid of 1.0-1.70:1, but the structure It is more complicated, and a large amount of materials are not well mixed during the process of entering the heating reaction zone from the feed inlet, which affects the improvement of esterification efficiency, and at the same time, it is more troublesome to control the material flow

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