Decolorization of polyethylene polyamines using ruthenium

Details Decolorization of polyethylene polyamines using ruthenium Decolorization of polyethylene polyamines using ruthenium

C - Chemistry, Metallurgy

07

C

C07C 211/14 (2006.01) C07C 209/84 (2006.01) G03C 1/06 (2006.01)

Patent

CA 2117579

The present invention relates to a process for the reduction of the color of polyamines by reacting at elevated temperature, e.g. 120-170°C.,and pressure, e.g. 500 to 6000 psig. the colored polyamines, e.g. triethylenetetramine and tetraethylenepentamine, in the presence of a ruthenium on alumina hydrogenation catalyst. The catalyst for the polyamine decolorization process preferably has at least 0.5 wt.% Ru. In the process of the present invention, the polyamines can either be distilled into a narrow product composition and then hydrogenated, or a crude polyamine product can be hydrogenated and then distilled to produce the desired product composition.

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