Selective hydrogenation of crude high-butadiene C4 cuts

Details Selective hydrogenation of crude high-butadiene C4 cuts Selective hydrogenation of crude high-butadiene C4 cuts

1992-05-22

1993-07-13

McFarlane, Anthony

Chemistry of hydrocarbon compounds

Adding hydrogen to unsaturated bond of hydrocarbon, i.e.,...

Hydrocarbon is contaminant in desired hydrocarbon

585265, 585271, 585841, C07C 505

Patent

active

052275531

ABSTRACT:
A process for the selective hydrogenation of butadiene to butenes in the liquid phase or trickle phase in contact with a fixed-bed supported noble metal catalyst, wherein a high-butadiene C.sub.4 stream having a butadiene content of from 20 to 80% w/w, based on the weight of the C.sub.4 stream, is hydrogenated in a cascade of two reaction zones such that the hydrogenation product from the first reaction zone has a butadiene content of from 0.1 to 20% w/w and the hydrogenation product from the second reaction zone has a butadiene content of from 0.005 to 1% w/w, based in both cases on the weight of the C.sub.4 stream, provided that the butadiene content of the hydrogenation product from the second reaction zone is at least 5 times smaller than that of the hydrogenation product from the first reaction zone.

REFERENCES:
patent: 2402493 (1946-06-01), Greensfelder
patent: 3113983 (1963-12-01), Kirsch et al.
patent: 3655799 (1972-04-01), Lassau et al.
patent: 3770619 (1973-11-01), Derrien et al.
patent: 5059731 (1991-10-01), Berrebi
R. F. Peterson "Hydrogenation Catalysts, Noyer Data Corporation", N.Y. 1977 p. 183.
G. C. Bond "Catalysis by Metals" Academy Press London 1962 pp. 99 & 297.

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