| 摘要 |
Methods for improving color properties of triethanolamine, and triethanolamine compositions treated thereby, are disclosed, wherein the methods comprise: (a) providing a composition comprising triethanolamine; and (b) contacting the composition with an acid component and a basic component; wherein the acid component comprises an acid selected from the group consisting of phosphorous acid, hypophosphorous acid and mixtures thereof; and wherein the basic component comprises a compound selected from the group consisting of alkali metal hydroxides, alkaline earth metal hydroxides, ammonium hydroxides according to general formula (I), and mixtures thereof: <?in-line-formulae description="In-line Formulae" end="lead"?>[R<SUP>1</SUP>R<SUP>2</SUP>R<SUP>3</SUP>(2-hydroxyethyl)ammonium]hydroxide (I) <?in-line-formulae description="In-line Formulae" end="tail"?> wherein R<SUP>1</SUP>, R<SUP>2 </SUP>and R<SUP>3 </SUP>each independently represents a C<SUB>1-30 </SUB>alkyl or a C<SUB>2-10 </SUB>hydroxyalkyl; with the proviso that where the basic component comprises an alkali metal hydroxide, the molar ratio of acid component:basic component is 1:0.1 to 1:1, and where the basic component comprises an alkaline earth metal hydroxide, the molar ratio of acid component:basic component is 1:0.05 to 1:0.5.
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