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Method of storing finally produced triethanolamine after preparation process of triethanolamine

A technology of triethanolamine and hydroxylamine, applied in chemical instruments and methods, preparation of organic compounds, preparation of aminohydroxy compounds, etc., can solve problems such as the toxicity of triethanolamine, and achieve the effect of improving color and preventing discoloration

Active Publication Date: 2018-03-13
LOTTE CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] U.S. Patent No. 3,819,710 discloses a method for improving the color quality of ethanolamine produced by hydrogenation of ethanolamine in the presence of selected catalysts, but the method has the problem of additional processing costs
[0009] In addition, U.S. Patent No. 4,673,762 discloses a method for preventing discoloration of the produced triethanolamine and stabilizing the color of the produced triethanolamine by adding a small amount of ethylene oxide to the produced triethanolamine as post-treatment, but this There are concerns about the toxicity of the triethanolamine obtained

Method used

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  • Method of storing finally produced triethanolamine after preparation process of triethanolamine
  • Method of storing finally produced triethanolamine after preparation process of triethanolamine
  • Method of storing finally produced triethanolamine after preparation process of triethanolamine

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Experimental program
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Effect test

Embodiment 1

[0034] First, crude triethanolamine was prepared by a process comprising reacting ammonia with ethylene oxide in an aqueous medium at a molar ratio of 1:2 (ammonia:ethylene oxide) at 60° C. and atmospheric pressure. A mixture of crude triethanolamine, water and residue unreacted with ammonia is obtained and the water and ammonia are separated from crude triethanolamine using a distillation column arranged in series connecting said mixture to a crude triethanolamine separation step. Then, in order to continuously connect said crude triethanolamine free of water and ammonia to purification, ethanolamine, diethanolamine and ethoxylated triethanolamine are sequentially separated from triethanolamine by distillation of three distillation columns arranged in series to obtain Preparation of purified triethanolamine. Then, before the purified triethanolamine becomes discolored, quantify 200 ppm of phosphorous acid (using a 50% aqueous solution relative to the amount of phosphorous aci...

Embodiment 2

[0036] The experiment was carried out in the same manner as in Example 1, except that phosphorous acid (500 ppm), sodium borohydride (400 ppm) and hydroxylamine (200 ppm; a 50% aqueous solution relative to the amount of hydroxylamine was used) were treated in Example 1.

Embodiment 3

[0038] Experiments were performed in the same manner as in Example 1, except that phosphorous acid (1,000 ppm), sodium borohydride (400 ppm) and hydroxylamine (200 ppm) in Example 1 were treated.

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Abstract

The invention relates to a method of storing finally produced triethanolamine after preparation process of triethanolamine, various methods for preventing discoloration of the triethanolamine during storage are provided. Methods for specify a coloring inhibitor (treatment during the process or after the process) are safe and optimized, so that the method is free of extra high cost. A technology for improving effect with a material, which is used as a common choice in the process, being used as a post-treatment agent for the process is very difficult to find out; in addition, a technology for improving the effect with a material, which is used as a common choise of post-treatment agent, being used in a cmobination manner is also very difficult to find out; for solving the discoloration of the triethanolamine during storage, the invention provides a treatment composition, which is the substance commonly used as treatment agent during the process, as a post-treatment agent, and provides atreatment composition which can achieve significant improvement via combination treatment by means of the common post-treatment materials.

Description

[0001] References to related applications [0002] This application claims priority and all benefits derived from Korean Patent Application No. 10-2016-0113937 filed on September 5, 2016, the entire contents of which are incorporated herein by reference. technical field [0003] The present disclosure relates to preventing discoloration of triethanolamine, and more particularly, to a method of storing triethanolamine for preventing discoloration of triethanolamine and improving the color of triethanolamine. Background technique [0004] Triethanolamine (TEA) is used in the preparation of many products such as dispersants, emulsifiers, soaps, detergents and shampoos, in particular in the cosmetic or pharmaceutical industry. [0005] Typically, the crude triethanolamine product obtained by reacting ammonia with ethylene oxide and evaporating monoethanolamine and diethanolamine is subjected to fractional distillation to obtain pure colorless triethanolamine. Triethanolamine is...

Claims

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Application Information

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IPC IPC(8): C07C213/10C07C215/12
CPCC07C213/10C07C215/12C01B6/21C01B21/16C01D5/00C01D7/00C07C215/10
Inventor 黄素罗刘钟澈徐荣钟金吉万
Owner LOTTE CHEM CORP
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