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Method for separating ethylene diamine and water azeotrope

An ethylenediamine and water azeotrope technology, applied in the purification/separation of amino compounds, chemical industry, climate sustainability, etc., can solve the problems of dehydrating agent pollution, high energy consumption, inability to perform heat recovery, etc., and reduce energy consumption. , the effect of reducing production energy consumption

Inactive Publication Date: 2019-06-04
SHANDONG LIANMENG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method needs pervaporation, the equipment loss is fast, and the heat cannot be recovered
[0005] It can be seen that the method for separating ethylenediamine and water azeotrope in the prior art has the problems of dehydrating agent pollution and high energy consumption, and cannot perform heat recovery

Method used

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  • Method for separating ethylene diamine and water azeotrope

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Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1 A kind of method of separating ethylenediamine and water azeotrope

[0025] The ethylenediamine and water azeotrope are introduced into the pressurized rectification column A, the operating pressure is controlled at 0.95Mpa, the temperature at the bottom of the column is controlled at 210°C, and the temperature at the top of the column is controlled at 195°C. Ethylenediamine is extracted; the reflux ratio is 14~16; the purity of the water distilled from the top of the tower is 99.6%, and the purity of the ethylenediamine extracted from the bottom of the tower is 99.8%.

[0026] The ethylenediamine and water azeotrope: water 20wt%, ethylenediamine 75%~79wt%, organic amine mixture 1%~5%, the components of the organic amine mixture include diethylenetriamine, aminopiperazine, Hydroxyethylethylenediamine.

[0027] The water evaporated from the top of the tower is introduced into the waste heat recovery device B. When it is introduced, the temperature of the wa...

Embodiment 2

[0028] Embodiment 2 A kind of method of separating ethylenediamine and water azeotrope

[0029] The ethylenediamine and water azeotrope are introduced into the pressurized rectification column A, the operating pressure is controlled at 0.80Mpa, the temperature at the bottom of the tower is controlled at 200°C, and the temperature at the top of the tower is controlled at 185°C. Ethylenediamine is extracted; the reflux ratio is 7~11; the purity of the water distilled from the top of the tower is 99.7%, and the purity of the ethylenediamine extracted from the bottom of the tower is 99.7%.

[0030] The ethylenediamine and water azeotrope: water 20wt%, ethylenediamine 75%~79wt%, organic amine mixture 1%~5%, the components of the organic amine mixture include diethylenetriamine, aminopiperazine, Hydroxyethylethylenediamine.

[0031] The water steamed from the top of the tower is introduced into the waste heat recovery device B. When it is introduced, the temperature of the water is...

Embodiment 3

[0032] Embodiment 3 A kind of method of separating ethylenediamine and water azeotrope

[0033] The ethylenediamine and water azeotrope are introduced into the pressurized rectification column A, the operating pressure is controlled at 1.05Mpa, the temperature at the bottom of the tower is controlled at 215°C, the temperature at the top of the tower is controlled at 198°C, the water is distilled from the top of the tower, the bottom of the tower is Ethylenediamine is extracted; the reflux ratio is 18~21; the output from the top of the tower is water with a purity of 99.5%, and the bottom of the tower is ethylenediamine with a purity of 99.9%.

[0034] The ethylenediamine and water azeotrope: water 20wt%, ethylenediamine 75%~79wt%, organic amine mixture 1%~5%, the components of the organic amine mixture include diethylenetriamine, aminopiperazine, Hydroxyethylethylenediamine.

[0035] The water evaporated from the top of the tower is introduced into the waste heat recovery dev...

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Abstract

The invention provides a method for separating an ethylene diamine and water azeotrope. The method comprises dehydration rectification and waste heat recovery. The dehydration rectification comprisesthe following steps: adding the ethylene diamine and water azeotrope into a dehydration rectifying tower from the upper part of the dehydration rectifying tower, the temperature of the tower top is controlled to be 175-200 DEG C, the temperature of the tower kettle is 200-210 DEG C, the operation pressure of dehydration rectification is 0.5-1.0 Mpa, and the reflux ratio of the dehydration rectification is 5-25. The method is capable of pressurizing and separating ethylene diamine and water without adding of a dehydrating agent or adding of auxiliary separating equipment, the purity of the dehydrated ethylene diamine is high, and the steam heat generated by dehydration distillation can be recovered.

Description

technical field [0001] The invention belongs to the technical field of organic amine production, and relates to a method for separating ethylenediamine and water azeotrope. Background technique [0002] In the prior art production process for preparing ethylenediamine by hydrogenation of ethanolamine, the obtained crude ethylenediamine has a low purity and contains a certain proportion of water. In order to obtain high-purity ethylenediamine, the produced ethylenediamine needs to be dehydrated again. The main technical means is to add a dehydrating agent or add other separation devices for processing. The above-mentioned existing technology increases manpower and material resources, and at the same time, adding a dehydrating agent will bring a small amount of pollutants, which will affect the purity of the product; using a pervaporation device for separation has high energy consumption, which is not conducive to large-scale production, and the excess heat cannot Recycle. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C209/86C07C211/10
CPCY02P20/10Y02P20/50
Inventor 张春江刘志臣陈伟杰席海伟唐春晖曹国起姜亦雷冯文波
Owner SHANDONG LIANMENG CHEM
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