Color reduction of polyamines by mild catalytic hydrogenation

Details Color reduction of polyamines by mild catalytic hydrogenation Color reduction of polyamines by mild catalytic hydrogenation

1986-09-26

1988-08-23

Hollrah, Glennon H.

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

Organic compounds

Amino nitrogen containing

564 2, 564479, C07C 8526

Patent

active

047662476

ABSTRACT:
The present invention relates to a process for the reduction of the color of polyamines by reacting at elevated temperature, i.e. 50.degree. to 175.degree. C., and pressure, i.e. 50 to 1500 psig, such colored polyamines, e.g. triethylenetetramine or tetraethylenepentamine, in the presence of a hydrogenation catalyst, e.g. Raney nickel or palladium on carbon, and a hydrogen atmosphere for a period of time sufficient to effectuate the desired reduction in color. 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.

REFERENCES:
patent: 3723529 (1973-03-01), Pitts et al.
patent: 4347381 (1982-08-01), Tuvell
patent: 4463193 (1984-07-01), Johnson et al.
patent: 4487987 (1984-12-01), Paslean et al.
patent: 4503253 (1985-03-01), Ford et al.
patent: 4567303 (1986-01-01), Boettger et al.
patent: 4570019 (1986-02-01), Gibson et al.
U.S. Ser. No. 674,611 "Polyalkylene Polyamines Via Vapor Phase Reaction" Ford et al.

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