Decolorization of polyethylene polyamines using ruthenium

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

1993-08-25

1994-11-15

Raymond, Richard L.

Organic compounds -- part of the class 532-570 series

Organic compounds

Amino nitrogen containing

564469, 564470, 564478, 564479, 564480, 564497, 564503, 564511, 564512, C07C20984

Patent

active

053649710

ABSTRACT:
The present invention relates to a process for the reduction of the color of polyamines by reacting at elevated temperature, e.g. 120.degree.-170.degree. 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 hydrogenareal, or a crude polyamine product can be hydrogenated and then distilled to produce the desired product composition.

REFERENCES:
patent: 3595921 (1971-07-01), Pitts
patent: 3723529 (1973-03-01), Pitts et al.
patent: 4394523 (1983-07-01), Allen
patent: 4570019 (1986-02-01), Gibson et al.
patent: 4731165 (1988-03-01), Niebruegge et al.
patent: 4766247 (1988-08-01), Ford et al.

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