Reducing the coloration of aromatic diamines
AssigneeAlbemarle Corporation
InventorsPaul L. Wiggins, Gregory H. Lambeth, William R. Brown
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Abstract
Existing coloration of a liquid ring-polyalkyl-substituted aromatic primary diamine is reduced by blending into such diamine a color-reducing amount of at least one dihydrocarbylhydroxylamine. Preferably, the resultant product is stored in a closed container under an inert atmosphere.
Claims19
A method of reducing the existing coloration of a liquid ring-polyalkyl-substituted aromatic diamine, which method comprises blending into said ring-polyalkyl-substituted aromatic diamine a color-reducing amount of at least one dihydrocarbylhydroxylamine.
A method of reducing the existing coloration of a liquid ring-polyalkyl-substituted aromatic diamine, which method comprises blending into said ring-polyalkyl-substituted aromatic diamine a color-reducing amount of at least one dihydrocarbylhydroxylamine, and maintaining the resultant blend under an inert atmosphere.
A composition which comprises a liquid ring-polyalkyl-substituted aromatic primary diamine, with which has been blended a color-reducing amount of at least one dihydrocarbylhydroxylamine such that the color of said diamine has been reduced.
In a process for the production of diethyltoluenediamine which comprises catalytically alkylating toluenediamine with ethylene such that a clear liquid diethyltoluenediamine product having an amber-type coloration is formed, the improvement which comprises blending with the diethyltoluenediamine product a color-reducing amount of at least one N,N-dihydrocarbylhydroxylamine such that the coloration of the liquid diethyltoluenediamine product is reduced, and maintaining the resultant blend under an inert atmosphere.
Dependencies are inferred from the claim text.