| 摘要 |
The present invention relates to a process for the reduction of the color of polyamines by reacting at elevated temperature, e.g. 120-170.degree.C., and pressure, e.g. 500 to 6000 psig. the colored polyamines, e.g. triethylenetetramine and tetraethylelepentamine, in the presence of a cobalt on alumina hydrogenation catalyst promoted with copper and chromium. 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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