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

A technology of esterification kettle without stirring, which is applied in the field of polyester esterification kettle, and can solve the problems of high energy consumption, large number of kettles, and large entrainment of precondensation gas phase mist

Inactive Publication Date: 2006-10-11
BEIJING INNOVATION POLYMERIZATION TECH
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AI Technical Summary

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 illustrated with the following specific embodiments in conjunction with the accompanying drawings, but the scope of protection is not limited to the following specific embodiments.

[0030] In the non-stirring dual-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 at the bottom of the first esterification zone and the inner pipe 11 through the nozzle from the slurry inlet a , merges with the esterified product that circulates back from the inner tube 11 of the small head at the bottom, flows upward after being mixed by the annular static mixer 12, and enters the heat exchange array tubes 8 through the annular lower tube plate 7 of the heat exchanger, and in the array tube The medium is heated by the shell-side heat medium to carry out esterification, the water generated by the reaction and the excess EG in the slurry ...

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Abstract

The invention relates to a non-stirred dual-zone polyester esterification kettle. The first esterification zone is naturally circulated by density difference, and the esterification product is used to dissolve PTA powder to realize a homogeneous reaction; The circle guides the flow of the ring plate to realize the push flow and make full use of the reaction driving force. The rate of esterification out of the still can reach 96.5-97%.

Description

technical field [0001] The invention relates to a polyester esterification kettle, more specifically to a non-stirred double-zone polyester esterification kettle. technical background [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. The number is large, and the manufacturing and operating costs are high. 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 . Invention content: [0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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