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New type non-agitating kettle with two regions for esterifying polyester

A non-stirring, esterification tank technology, applied in the field of polyester esterification tanks, can solve the problems of precondensation gas phase mist entrainment, high manufacturing and operating costs, and high energy consumption

Inactive Publication Date: 2005-10-26
BEIJING INNOVATION POLYMERIZATION TECH
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Problems solved by technology

[0002] At present, there are mainly two types of esterification reactors used in PET polyester plants. German Zimmer and Swiss Inventa use two stirred tanks in series, with an esterification rate of 96-97%, which can meet the subsequent pre-condensation requirements. Large number, high manufacturing and operating costs
DuPont USA adopts a single non-stirring external natural circulation esterification kettle, the esterification rate is only 92-94%, and a large amount of EG must be injected into the subsequent precondensation process to supplement the esterification, which consumes a lot of energy and entrains more precondensation gas phase mist

Method used

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  • New type non-agitating kettle with two regions for esterifying polyester
  • New type non-agitating kettle with two regions for esterifying polyester
  • New type non-agitating kettle with two regions for esterifying polyester

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Embodiment Construction

[0029] The present invention is further described with the following specific embodiments in conjunction with the accompanying drawings, but the protection scope is not limited to the following specific embodiments.

[0030] In the non-stirring double-zone esterification kettle of the present invention, the slurry with a molar ratio of EG and TPA of 1.8 enters the lower part of the annular space between the small head 10 and the inner pipe 11 of the first esterification zone from the slurry inlet a through the nozzle, It merges with the esterified product circulating back from the inner tube 11 of the small head, and flows upward after being mixed by the annular static mixer 12. It enters the heat exchange tubes 8 through the annular lower tube plate 7 of the heat exchanger, and is surrounded by shells in the tubes. The process heat medium is heated and heated to carry out esterification, the water generated by the reaction and the excess EG in the slurry evaporate, and the gas...

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Abstract

The present invention relates to a non-stirring double-zone polyester esterification still. Its first esterification zone can utilie density difference to implement natural circulation, and uses esterification method to dissolve PTA powder so as to implement homogeneous reaction, then second esterification zone can make the material flow along the flow-induced helical plate or multi-ring flow-induced ring plate so as to implement plug flow, and can fully utilize reaction driving force, its still-discharging esterification rate can be up to 96.5%-97%.

Description

technical field [0001] The invention relates to a polyester esterification kettle, more specifically a novel non-stirring two-zone polyester esterification kettle. technical background [0002] At present, there are two main types of esterification reactors used in PET polyester plants. German Zimmer and Swiss Ivenda use two stirred tanks in series, with an esterification rate of 96-97%, which can meet the requirements of subsequent pre-polycondensation. The number is large, and the manufacturing and operating costs are high. DuPont of the United States adopts a single non-stirring external natural circulation esterification kettle, and the esterification rate is only 92-94%. It is necessary to inject a large amount of EG in the subsequent pre-polycondensation process to supplement the esterification, resulting in high energy consumption and more gas-phase mist entrainment in the pre-polycondensation process. . Invention content: [0003] The object of the present invent...

Claims

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Application Information

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IPC IPC(8): C08G63/78
Inventor 刘兆彦施景云史佳林赵玲方旭时文艺周元涂智贤
Owner BEIJING INNOVATION POLYMERIZATION TECH
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