Esterification reactor

Abstract

The invention relates to an esterification reactor, comprising a reactor barrel, and a heating device and a top stirrer which are arranged in the reactor barrel, wherein the top stirrer is provided with a main spindle, a stirrer driving device is connected to the upper end of the main spindle, the reactor barrel is formed by an upper end enclosure, a middle barrel body and a lower end enclosure which are connected with one another in sequence by flanges with slot structures, all the slot structures are processed by a large vertical lathe, the heating device comprises a plurality of vertical heating barrels which are connected with an evaporator by corresponding inlet and outlet guide pipes, and the heating barrels, the guide pipes and the evaporator form a vacuum system with unpowered circulation of heating mediums. The esterification reactor is suitable for a current large equipment processing technology, the coaxiality of the internal parts is high, and the esterification reactor has a simple and reasonable structure and is convenient to transport, install and maintain, so that an ultra-large esterification reactor becomes possible.

Description

technical field [0001] The invention relates to an esterification reactor, which can be used for esterification reactions in production processes such as ethylene terephthalate (BHET), and belongs to the technical field of chemical industry. Background technique [0002] In the production of polyester, ethylene glycol (EG) and terephthalic acid (PTA) are used for esterification to produce ethylene terephthalate (BHET), and then polyethylene terephthalate is synthesized by polycondensation Alcohol ester is polyester (PET). The esterification reaction device of BHET often adopts two-stage equipment. The first stage is mainly used for reaction rate control, and the second stage is mainly used for the completion of esterification reaction. The esterification rate reaches the polymerization rate. According to the requirements of the process, the esterification reactor of the present invention can be used in two esterification reaction devices at the same time. [0003] There are...

AI Technical Summary

Problems solved by technology

[0004] With the enlargement of the polyester project, the volume of the esterification reactor is getting larger and larger. The large reactor not only reduces the cost of reactor operation, but also provides a very stable reaction process, but it also has a negative effect on the manufacture and production of the reactor. Transportation poses new problems: for example, a reactor that is too large may exceed the size limit of general road and rail transportation; the number of reactants to be accommodated increases, and the demand for heat required for reaction increases significantly, how to manufacture a coil with a huge heating capacity Or how to provide a large amount of heat to meet the reaction requirements; and how to ensure the stable operation of the agitator, how to suppress the rigidity deterioration that may be caused by the increase in the linear size of the agitator and the unbalanced disturbance caused by the violent reaction of the reactants, etc. A Technical Bottleneck of Superlarge Esterification Reactor

Images