Method for decolorization of alkanolamines and alkyleneamines
AssigneeUnion Carbide Chemicals & Plastics Technology Corporation
InventorCharles A. Gibson
Life of this patent
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Abstract
Color-containing alkanolamines or alkyleneamines, having color numbers of up to 100 PtCo or higher, can be treated with inorganic solid acidic catalysts. Inorganic support materials having bonded inorganic acid functionalities may be used as the inorganic solid acidic catalysts. In the presence of water, these inorganic solid acidic catalysts produce decolorized alkanolamines or alkyleneamines having color numbers of 20 PtCo or less. The process of decolorization can be carried out in batch or continuous mode processes thus providing low cost, high quality and high purity end products.
Claims18
A method of producing alkanolamines or alkyleneamines having a reduced color comprising contacting, in the presence of water, color-containing alkanolamines or alkyleneamines with a solid acid catalyst comprising a metal oxide having a bonded inorganic acid functionality selected from the group consisting of chloride, fluoride, and sulfate ions, under conditions effective to reduce the color of said alkanolamines or alkyleneamines.
A method of producing aminoethylethanolamine having a reduced color comprising contacting, in the presence of water, color-containing aminoethylethanolamine with a solid acidic catalyst comprising an alumina support material having a bonded fluoride acid functionality, under conditions effective to reduce the color of said aminoethylethanolamine.
A method of producing triethylenetetramine having a reduced color comprising contacting, in the presence of water, color-containing triethylenetetramine with a solid acidic catalyst comprising an alumina support material having a bonded fluoride acid functionality, under conditions effective to reduce the color of said triethylenetetramine.
Dependencies are inferred from the claim text.