A kind of esterification reaction system

Abstract

The invention relates to an esterification reaction system. The esterification reaction system comprises a PTA (Pure Terephthalic Acid) powder tank and an esterification kettle, wherein a PTA feeding hole, an ethylene glycol inlet and a gas-phase outlet are formed in the top of the esterification kettle; an external flow guide barrel is arranged at the lower part of an inner wall of the esterification kettle; a discharging annular groove is formed between the external flow guide barrel and the shell; the external flow guide barrel is provided with an outlet which is communicated with the discharging annular groove; the bottom of the discharging annular groove is communicated with an esterified material outlet; an inner cavity of the external flow guide barrel is provided with an internal flow guide barrel; the internal flow guide barrel is lower than the external flow guide barrel; a central material pipe is arranged in an inner cavity of a shell of the esterification kettle; the upper end of the central material pipe is connected with the PTA feeding hole and the lower end of the central material pipe is communicated with a crossed pipe; four branch pipes of the crossed pipe are bent towards the same side in a circular arc transition manner; the ethylene glycol inlet aligns to the part between the external flow guide barrel and the internal flow guide barrel. The system provided by the invention is further provided with an esterified water, ethylene glycol and nitrogen gas separation tower, a first condenser, a compressor and a second condenser. The system is simple in structure, can realize esterified water removal, and complete recycling of ethylene glycol and nitrogen gas, and is low in energy consumption and high in production efficiency.

Description

technical field [0001] The invention relates to an esterification reaction system, belonging to the technical field of chemical raw material production equipment. Background technique [0002] The traditional esterification production equipment includes a PTA powder tank and an esterification kettle. The esterification kettle is equipped with a heating jacket for the esterification kettle. An esterification material outlet is provided, and a PTA powder pipe is connected to the lower part of the PTA powder tank, and the PTA powder pipe is connected to the PTA feed port of the esterification kettle. [0003] In the production process, the PTA powder and ethylene glycol need to be mixed and beaten first, and then enter the esterification kettle from the PTA feed port for heating. During the reaction process, stirring blades must be used to continuously stir. The process and equipment are complex and can High consumption. Contents of the invention [0004] The object of the ...

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Problems solved by technology

[0003] In the production process, the PTA powder and ethylene glycol need to be mixed and beaten first, and then enter the esterification kettle from the PTA feed port for heating. During the reaction process, stirring blades are also used to continuously stir. The process and equipment are complex and can be High consumption

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