Method and device for processing off-gases in productive process of polyester or copolyester

A production process and tail gas technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve problems such as easy explosion, danger, waste of tetrahydrofuran, etc., to eliminate potential safety hazards, reduce investment and operating costs, avoid Effects of contact with open flames

Active Publication Date: 2013-08-07
KINGFA SCI & TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unlike acetaldehyde, tetrahydrofuran is prone to explosion when mixed with air, so there is a certain risk in using compressed air as a gas lift or jet medium for gas-liquid separation or tail gas transportation. At the same time, the process tail gas containing THF Incineration treatment will inevitably also cause a large amount of waste of tetrahydrofuran emissions

Method used

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  • Method and device for processing off-gases in productive process of polyester or copolyester
  • Method and device for processing off-gases in productive process of polyester or copolyester

Examples

Experimental program
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Effect test

Embodiment 1

[0034] A device for treating tail gas in the production process of polyester or copolyester, such as figure 1 shown. The vacuum tail gas containing tetrahydrofuran discharged from the gas phase tube of the liquid ring vacuum pump and the high-concentration vacuum tail gas condensed by the top condenser of the butanediol separation tower enter the water jet pump 1 through the pipeline 2 and the pipeline 3 respectively. The water jet pump 1 communicates with the circulating water storage tank 7 through the tail pipe 8. After the two vacuum tail gases in the water jet pump 1 are absorbed by the high-pressure water generated by the circulating water pump 5, they enter into the circulating water through the tail pipe 8 of the water jet pump together. In the storage tank 7, gas-liquid separation is carried out in the circulating water storage tank 7.

[0035] Since the pressure of the butanediol separation tower in the PBT unit is usually controlled within the range of 40-60KPa, an...

Embodiment 2

[0041] A device for treating tail gas in the production process of polyester or copolyester, such as figure 2 As shown, it differs from the device in Example 1 in that the tetrahydrofuran recovery liquid is automatically discharged, that is, the bottom of the spray absorption tower 13 of the device in this embodiment is connected to the circulating water storage tank 7 through a pipeline 14, and the spray absorption tower 13 absorbs The aqueous solution containing tetrahydrofuran flows into the circulating water storage tank 7; in addition, after the pipeline passes through the heat exchanger 4, there is another way (ie, the pipeline 16) to transport the circulating water to the tetrahydrofuran recovery unit for recovery.

[0042] The structure, connection relationship and working principle of other parts of the device of this embodiment are the same as those of the device of embodiment 1.

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Abstract

The invention discloses a method and device for processing off-gases in the productive process of polyester or copolyester. The method comprises the following steps of: firstly leading the vacuum off-gases containing tetrahydrofuran to be in contact with circulating water and absorbed through a water jet pump, and sending the vacuum off-gases not being absorbed by water to a spray absorber for carrying out spraying absorption once again; and directly sending the ordinary pressure or positive pressure off-gases containing tetrahydrofuran to the spray absorber for spraying absorption. The method and device provided by the invention can be used for processing industrial off-gases generated by different devices in the productive process of polyester or copolyester in a differentiation manner;and as more than one automatic regulating valves are arranged in a pipeline by which the vacuum tail gases are communicated to the water jet pump, the automatic regulating valves can lead the pressures of the vacuum off-gases under different operating conditions to be kept in a constant working range so that a system can operate in a more stable condition. The device provided by the invention canavoid the probability to the maximum degree that inflammable and explosive objects are in contact with open fire, thereby the corresponding potential safety hazard is eliminated fundamentally.

Description

technical field [0001] The invention relates to a method and a device for treating tail gas in the production process of polyester or copolyester. The tail gas contains both vacuum process tail gas and normal pressure process tail gas, and the process tail gas contains tetrahydrofuran. Background technique [0002] Polyesters and copolyesters are usually prepared by esterification or transesterification of aromatic dicarboxylic acids, aliphatic dicarboxylic acids and aliphatic diols, followed by polycondensation. As disclosed in US Pat. In production, the esterification reaction, transesterification reaction and polycondensation reaction are all carried out under vacuum and reduced pressure conditions. Under vacuum conditions, small molecular substances such as water, 1,4-butanediol and by-product tetrahydrofuran are more likely to be removed from the system. seperate. Therefore, in the production process of polyester and copolyester with 1,4-butanediol and dicarboxylic ac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/78B01D53/18
Inventor 雷强艾磊曾祥斌王道波吴超蔡彤旻叶南飚
Owner KINGFA SCI & TECH CO LTD
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