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Distillation system and technology of ethylene glycol and diethylene glycol in polyol waste liquid

A diethylene glycol and distillation system technology, which is applied in the field of distillation system and distillation process, can solve the problems of high recycling cost, large interference, and low content, and achieve the effects of reducing environmental protection expenses, reducing load, and reducing content

Pending Publication Date: 2019-01-11
CHONGQING HUAFON CHEM +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Ethylene glycol and diethylene glycol in the separated waste liquid are usually separated by rectification equipment, and the purity of the separated ethylene glycol and diethylene glycol must reach more than 99.7%. Carry out, so that the product index that rectification comes out meets the standard, yet, because the content of ethylene glycol, diethylene glycol in the waste liquid is low, the polyester class small molecule that contains in the waste liquid is opposite to ethylene glycol, diethylene glycol The interference of alcohol is relatively large, resulting in the low purity of ethylene glycol and diethylene glycol separated by rectification. It needs to be refined many times to meet the standards as raw materials for the production of polyester polyols, resulting in ethylene glycol, diethylene glycol Recycling costs are too high

Method used

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  • Distillation system and technology of ethylene glycol and diethylene glycol in polyol waste liquid

Examples

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Effect test

Embodiment 1

[0029] see figure 1, is a specific example of a distillation system for ethylene glycol and diethylene glycol in polyol waste liquid. The distillation system of ethylene glycol and diethylene glycol in polyol waste liquid includes a first rectification tower 1, a second rectification tower 2, and a vacuum device 3, and the first rectification tower 1 includes a first tower body 1a , the first reboiler 1b, the first condenser 1c, the first separator 1d, the first pump 1e, the second rectification column 2 includes a second column body 2a, a second reboiler 2b, a second condenser 2c, the second separator 2d, the second pump 2e, the first tower body and the second tower body adopt conventional packed towers, and the reboiler, condenser, separator and pump are all conventional chemical equipment on the market, wherein The separator adopts cyclone separator. The upper part of the first tower body 1a is connected with a feed pipe 4. In this embodiment, the feed pipe extends horizo...

Embodiment 2

[0031] Get 500ML waste liquid, detect by infrared analysis, diethylene glycol content is 21.87% in waste liquid, and ethylene glycol content is 49.62%, and 1.4BG (1.4 dibutanol) content is 27.49%, and surplus is a small amount of water and Polyester polyol.

[0032] Adopt embodiment one distillation system to separate the method for ethylene glycol, diethylene glycol in polyol waste liquid, have the following steps:

[0033] 1) Distill the waste liquid at 100°C to completely remove the water. After the waste liquid is stabilized, it enters the first tower body through the feed pipe for rectification. Control the relative vacuum degree of the first tower body to about -88KPa and the rectification temperature When the temperature is about 165°C, close the first valve a to form 100% reflux. After the rectification environment of the first tower body is stable, control the first valve to make 5%-6% ethylene glycol return to the first tower body. The ethylene glycol gas at the top...

Embodiment 3

[0038] Get 500ML waste liquid, detect by infrared analysis, diethylene glycol content is 20.12% in waste liquid, and ethylene glycol content is 52.34%, and 1.4BG (1.4 dibutyl alcohol) content is 25.32%, and surplus is a small amount of water and Polyester polyol.

[0039] Adopt embodiment one distillation system to separate the method for ethylene glycol, diethylene glycol in polyol waste liquid, have the following steps:

[0040] 1) Distill the waste liquid at 100°C to completely remove water. After the waste liquid is stabilized, it enters the first tower through the feed pipe for rectification. Control the relative vacuum of the first tower to about -89KPa, and the rectification temperature When the temperature is about 165°C, close the first valve a to form 100% reflux. After the rectification environment of the first tower body is stable, control the first valve to make 5%-6% ethylene glycol return to the first tower body. The ethylene glycol gas at the top of the first ...

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Abstract

The invention discloses a distillation system of ethylene glycol and diethylene glycol in a polyol waste liquid. The system comprises first and second rectification columns and a vacuuming device. Thefirst rectification column comprises a first column body, a first reboiler, a first condenser, a first separator and a first pump. The second rectification column comprises a second column body, a second reboiler, a second condenser, a second separator and a second pump. The system has a simple structure and is easy to operate. Through two valves, a reflux ratio of ethylene glycol and diethyleneglycol is controlled so that high-purity ethylene glycol and diethylene glycol are separated and have purity of 99.7% or more. The distillation system satisfies recycling standards of enterprises, effectively reduces the recovery and recycling cost of ethylene glycol and diethylene glycol, effectively reduces the load to the environmental protection equipment and reduces the environmental protection expenses of enterprises.

Description

technical field [0001] The invention relates to the field of fine chemicals, in particular to a distillation system and distillation process for ethylene glycol and diethylene glycol in polyol waste liquid. Background technique [0002] When chemical companies produce polyester polyols, the waste liquid produced contains ethylene glycol, diethylene glycol, water and small polyester molecules. Among them, ethylene glycol and diethylene glycol are the raw materials for producing polyester polyols. Therefore, it is very necessary to recycle the ethylene glycol and diethylene glycol contained in the waste liquid. [0003] The ethylene glycol and diethylene glycol in the separated waste liquid are usually separated by rectification equipment. The purity of the separated ethylene glycol and diethylene glycol must reach more than 99.7% to be qualified, and the rectification process must continue after the start Carry out, so that the product index that rectification comes out meet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/04C02F101/34
CPCC02F1/04C02F2101/34
Inventor 陈恩之赵风轩徐淑媛乔华勇周孟龙刘天宇杨建新
Owner CHONGQING HUAFON CHEM
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