Pre-polycondensation reactor

Abstract

The invention relates to a pre-polycondensation reactor which comprises a shell, wherein an upper-layer partition and a lower-layer partition are arranged in the shell to divide the shell into an upper chamber, a middle chamber and a lower chamber; the lower chamber is divided into a plurality of annular regions by a plurality of concentrically arranged annular partitions; the central line of the concentrically arranged annular partitions coincides with the central line of the shell; each annular partition is provided with a channel hole communicated with the annular regions on the two sides; and a heating coil is arranged in each annular region. Due to the adoption of a structure of series connection of multiple regions, the polymerization reaction area is elongated, thereby effectively prolonging the flow channel length of the polymerization reaction area; and under the condition of the same flow rate, the flow time of the material in the polymerization reaction area is prolonged, thereby effectively prolonging the total time of polymerization reaction and obviously enhancing the polymerization degree of the end product on the premise of not increasing the production time and cost or the diameter of the pre-polycondensation reactor.

Description

technical field [0001] The invention relates to a chemical reaction device, in particular to a precondensation reactor for producing polyethylene terephthalate (PET) prepolymer melt. Background technique [0002] The four-pot process for polyester production includes the first esterification reactor, the second esterification reactor, the pre-condensation reactor and the final polycondensation reactor, where the pre-condensation reactor is usually used as a transitional device from the esterification reaction to the polycondensation reaction, not only To ensure the esterification reaction rate of the material, it is necessary to meet a certain polymerization rate requirement. Therefore, the reaction time and reaction efficiency of the material in the precondensation reactor are particularly important. [0003] A common precondensation reactor includes an upper chamber and a lower chamber, corresponding to the polyester reaction zone and the polymerization reaction zone, whic...

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Problems solved by technology

[0003] A common precondensation reactor includes an upper chamber and a lower chamber, corresponding to the polyester reaction zone and the polymerization reaction zone, which are used for the esterification reaction and the precondensation reaction respectively. The disadvantage of this structure is that the material The flow channel in the polymerization reaction zone is too short, the flow time of the material in the polymerization reaction zone is short, and there is a serious problem of material back-mixing, which often cannot meet the requirements of the polymerization reaction, especially for large-scale equipment. In this way, in order to ensure the required polymerization rate, it is usually necessary to prolong the total reaction time or increase the area of ​​the polymerization reaction zone. It is more difficult and not conducive to further expanding the scale of the precondensation reactor

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