A kind of separation method of triethylamine and water

Abstract

The invention discloses a method for separating triethylamine and water and aims to provide a separation method for triethylamine and water, that has the advantages of high purity after separation and no requirement for additional separating medium. The key point of the technical scheme is that the method for separating triethylamine and water comprises the following steps: 1) putting a triethylamine aqueous solution into a heater, heating and separating, thereby acquiring a triethylamine solution containing less than or equal to 5% of water and an aqueous solution containing less than or equal to 5% of triethylamine; 2) purifying triethylamine from the triethylamine solution containing less than or equal to 5% of water through a first rectifying tower and a second rectifying tower; 3) preliminarily extracting the aqueous solution containing less than or equal to 5% of triethylamine through a third rectifying tower and then guiding the preliminarily extracted mixed solution of triethylamine and water into the step 2) for purifying. The method disclosed by the invention is suitable for the technical field of purification for triethylamine in water.

Description

technical field [0001] The invention relates to the technical field of purification of triethylamine in water, more specifically, it relates to a method for separating triethylamine and water. Background technique [0002] Triethylamine is an important chemical raw material. Because it is a volatile liquid that is easily miscible with water at low temperature, the separation method of triethylamine and water in industrial production is mostly used Alkali absorbs its contained moisture, or adds entrainer and azeotropic rectification, but there are following problems: 1. If the content of triethylamine in water is low, use caustic soda to purify, the consumption is large, and the lye produced will cause Secondary pollution; 2. If the azeotropic rectification is added by adding an entrainer, there will be residual entrainer impurities in the separated triethylamine or water, which will affect the purity; 3. After the separation, the residual amount of triethylamine in the waste...

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Problems solved by technology

[0002] Triethylamine is an important chemical raw material. Because it is a volatile liquid that is easily miscible with water at low temperature, the separation method of triethylamine and water in industrial production is mostly used Alkali absorbs its contained moisture, or adds entrainer and azeotropic rectification, but there are following problems: 1. If the content of triethylamine in water is low, use caustic soda to purify, the consumption is large, and the lye produced will cause Secondary pollution; 2. If the azeotropic rectification is added by adding an entrainer, there will be residual entrainer impurities in the separated triethylamine or water, which will affect the purity; 3. After the separation, the residual amount of triethylamine in the waste liquid high

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