Polymerization esterification residual heat utilization method and apparatus

A technology of polymerizing ester and waste heat, applied in the field of polyester production, can solve problems such as energy waste, achieve the effects of reducing waste, obvious economic and social benefits, and simple process

Inactive Publication Date: 2008-08-27
RONGSHENG PETROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to effectively carry out gas stripping, the 40°C condensed water needs to be heated to above 100°C with steam, and this cycle will cause a great waste of energy

Method used

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  • Polymerization esterification residual heat utilization method and apparatus
  • Polymerization esterification residual heat utilization method and apparatus

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Embodiment Construction

[0023] The present invention will be described in detail below in conjunction with the accompanying drawings: the present invention is an improvement to the prior art. network connection, so the attached figure 2 The esterification reactor, auxiliary equipment and separation tower in the figure 1 same as shown in .

[0024] The invention is attached figure 1 On the basis shown, a waste heat utilization device for polymerization esterification is added, and the waste heat utilization method for polymerization esterification is as follows: the waste steam at the top of the separation tower on the upper part of the esterification reactor is drawn and supplied to at least one lithium bromide refrigerator as a heat source, And set a collection tank at the condensed water outlet of the refrigerator, use a pump to send this part of water to the waste water collection tank, part of it is used as the return water at the top of the tower, and the rest overflows to the stripping tower...

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Abstract

A utilization method of polymerization esterification residual heat and a device are disclosed. The method is that tower top waste steam of a knockout tower on the upper portion of an esterification reaction kettle is led out and supplied to at least one lithium brominate refrigerator as heat source, a collecting tank is arranged on the outlet of condensed water of the refrigerator, water is transmitted to a waste water collecting tank with a pump, a part of water is used as tower top reflux water, and the rest overflows into a stripping tower to be reclaimed. A pressure regulating valve is added on a pipe which is used to lead out waste steam from the top tower of the knockout tower, which can increase the steam pressure using as the heat source of the lithium brominate refrigerator. The device comprises at least one lithium brominate refrigerator, the top tower portion of the knockout tower on the upper portion of the esterification reaction kettle is connected on a condenser of the lithium brominate refrigerator through a steam pipe, a pressure regulating valve which can increase steam pressure in the steam pipe is connected in series on the steam pipe, and a steam branch pipe is further connected in parallel on the steam pipe, at least one air heat exchanger is connected on the steam branch pipe. The device has the characteristics of simple technology, safe, reliable and convenient usage and significant energy-saving effect, reduces the energy waste, increases the recycling usage of energy, and can really play the purpose of energy-saving and emission reduction.

Description

technical field [0001] The invention relates to a method and a special device for utilizing waste heat of polymerization esterification, and belongs to the technical field of polyester production. Background technique [0002] The existing esterification system process adopts the process of direct esterification reaction of PTA and EG. The direct esterification process of PTA and EG is a method of directly reacting PTA and EG to generate BHET, also known as the PTA method. It is a complicated process in which esterification reaction and polycondensation reaction proceed simultaneously, and the main reactions include: [0003] Esterification reaction: [0004] HOOC--COOH+2HOCH 2 CH 2 OH-HOCH 2 CH 2 OOC --COOCH 2 CH 2 OH+2H 2 o [0005] It can be seen from the esterification reaction equation that the esterification reaction is a reversible reaction, so in order to make the esterification reaction move towards the direction that is beneficial to the positive reaction,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/78C08G63/12F25B15/06
CPCY02A30/27Y02B30/62Y02P20/10
Inventor 李水荣俞传坤郭成越袁文冲马立东李中明
Owner RONGSHENG PETROCHEM
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