Method for purifying ethylenediamine

A purification method, ethylenediamine technology, applied in the purification/separation of amino compounds, organic chemistry, etc., can solve the problems of equipment corrosion and low purity of ethylenediamine, and achieve the effect of avoiding equipment corrosion

Active Publication Date: 2010-06-09
山西玉龙化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the purity of ethylenediamine after purification by this method is no

Method used

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  • Method for purifying ethylenediamine
  • Method for purifying ethylenediamine

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Heat and vaporize water-containing ethylenediamine with a concentration of 85.0%, and enter the lower part of the extraction tower at a flow rate of 48.68g / h. Diethylene glycol monomethyl ether enters the extraction tower at a flow rate of 162.22g / h through a heater to 80°C In the upper part, the two are in reverse contact in the extraction tower filled with packing. The temperature at the top of the extraction tower is 61°C, the temperature at the bottom of the tower is 140°C, and the pressure is 20.3kPa. The water separated from the top of the extraction tower is discharged at a flow rate of 7.29g / h. The mixture of ethylenediamine and diethylene glycol monomethyl ether flows out at the bottom of the extraction tower at a flow rate of 203.61g / h, which is heated to 90°C by a heater and enters the middle of the rectification tower, where it is rectified. The temperature at the top of the rectification tower is 45°C, the temperature at the bottom of the tower is 150°C, and...

Embodiment 2

[0027] Heat and vaporize the water-containing ethylenediamine with a concentration of 92.0%, and enter the lower part of the extraction tower at a flow rate of 32.44g / h. Diethylene glycol monobutyl ether enters the extraction tower at a flow rate of 162.22g / h through a heater to 79°C In the upper part, the two are in reverse contact in the extraction tower filled with packing. The temperature at the top of the extraction tower is 63°C, the temperature at the bottom of the tower is 150°C, and the pressure is 16.3kPa. The water separated from the top of the extraction tower is discharged at a flow rate of 5.90g / h. The mixture of ethylenediamine and diethylene glycol monobutyl ether flows out at the bottom of the extraction tower at a flow rate of 188.74g / h, which is heated to 102°C by a heater and enters the middle of the rectification tower, where it is rectified , the temperature at the top of the rectifying tower is 48°C, the temperature at the bottom of the tower is 160°C, an...

Embodiment 3

[0029] Heat and vaporize the water-containing ethylenediamine with a concentration of 75.5%, and enter the lower part of the extraction tower at a flow rate of 40.55g / h, and triethylene glycol dimethyl ether enter the extraction tower at a flow rate of 162.22g / h through a heater to 85°C In the upper part, the two are in reverse contact in the extraction tower filled with packing. The temperature at the top of the extraction tower is 60°C, the temperature at the bottom of the tower is 138°C, and the pressure is 19.5kPa. The water separated from the top of the extraction tower is discharged at a flow rate of 9.55g / h. The mixture of ethylenediamine and triethylene glycol dimethyl ether flows out of the bottom of the extraction tower at a flow rate of 193.22g / h, which is heated to 90°C by a heater and then enters the middle of the rectification tower, and is rectified in the rectification tower. The temperature at the top of the rectification tower is 46°C, the temperature at the b...

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Abstract

The invention discloses a method for purifying ethylenediamine, comprising the following steps: (1) heating extractant, feeding the extractant in to an extracting tower from the upper part of the extracting tower, gasifying 60.0-92.0% water-bearing ethylenediamine, feeding the ethylenediamine into the lower part of the extracting tower, making the ethylenediamine reversely contact the extractant on the upper part of the extracting tower in the extracting tower, discharging water from the top of the extracting tower and separating the mixture of the ethylenediamine and the extractant at the bottom of the extracting tower, wherein the extractant is diethylene glycol monomethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether or diethylene glycol monobutyl ether; and (2) heating the mixture of the ethylenediamine and the extractant, feeding the mixture of the ethylenediamine and the extractant to the middle part of the extracting tower, rectifying the mixture ofthe ethylenediamine and the extractant in a rectifying tower, separating the ethylenediamine on the top of the rectifying tower and discharging the extractant from the bottom of the rectifying tower.The method is mainly used for purifying the ethylenediamine.

Description

technical field [0001] The invention relates to a method for purifying ethylenediamine. technical background [0002] Ethylenediamine is an important basic chemical raw material, mainly used in epoxy resin curing agent, pesticide, high molecular polymer and other fields. When ethylenediamine containing a small amount of water is used as an epoxy resin curing agent, the molecular weight of the epoxy resin will be reduced and the quality will be reduced. [0003] The crude ethylenediamine containing water obtained from the industrial production of ethylenediamine is purified to obtain ethylenediamine. The purification method is generally to use azeotropic distillation or extractive distillation to remove water. [0004] US3454645 discloses a method for purifying aqueous ethylenediamine. The method adopts the extraction and rectification method, and the concentration is 77% water-containing ethylenediamine, and the flow rate of 510g / h is added to the bottom of the extraction ...

Claims

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Application Information

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IPC IPC(8): C07C211/10C07C209/86
Inventor 杨建明吕剑王伟曾纪珺赵锋伟张伟李凤仙淡保松
Owner 山西玉龙化工有限公司
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