Prepolycondensating reactor device

Abstract

The invention relates to a prepolycondensating reactor device, comprising a shell. A clapboard is arranged in the shell, and divides the shell into an upper cavity and a lower cavity; the middle part of the clapboard is provided with an isolation cylinder extending upwards; the upper part of the isolation cylinder is provided with a guide valve communicating the upper cavity and the lower cavity;gas in the upper part of the upper cavity enters the lower cavity through the guide valve; the lower part of the isolation cylinder or the clapboard is provided with a trapping valve communicating the upper cavity and the lower cavity; and liquid in the lower part of the upper cavity enters the lower cavity through the trapping valve, so that adjustment on the flow rate and the pressure of the upper cavity and the lower cavity can be realized conveniently through adjusting the opening degree of each valve. The device has simple structure, convenient control and low cost, and can be mainly used for producing polyester.

Description

technical field [0001] The invention relates to a precondensation reactor device for producing polyethylene terephthalate (PET) prepolymer melt. Background technique [0002] The conventional polycondensation method for producing polyethylene terephthalate (PET) includes two stages of pre-condensation and final polycondensation. The pre-condensation is to completely complete the esterification reaction of the oligomer generated in the esterification stage, so that it The esterification rate increased to over 99%, and at the same time polycondensation reaction started. [0003] The precondensation reaction is in the conversion process from positive pressure to negative pressure. At present, most of them use two independent reactors to complete the precondensation reaction, and some factories use pipeline reactors or tower reactions to complete this ingenious conversion process. However, the effect is not particularly ideal. The two independent precondensation reactors lead t...

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Problems solved by technology

[0003] The precondensation reaction is in the conversion process from positive pressure to negative pressure. At present, most of them use two independent reactors to complete the precondensation reaction, and some factories use pipeline reactors or tower reactions to complete this ingenious conversion process. However, the effect is not particularly ideal. The two independent precondensation reactors lead to a long process flow, large floor space, large cost investment and complicated daily maintenance. The pipeline reactor or tower reactor also has a long process flow. , The one-time investment is relatively large, and at the same time, the loss of unreacted materials during parking is large, and the amount of waste is relatively large

[0004] Two independent reactors or devices integrated into one reactor are used for external circulation of liquid phase materials. In order to prevent the heat loss of materials in the external circulation, a large number of insulation layers or insulation jackets must be wrapped outside the circulation pipes. Increased production costs while maintaining a constant material temperature is difficult

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