Catalyst composition for the selective hydrogenation of benzene

Details Catalyst composition for the selective hydrogenation of benzene Catalyst composition for the selective hydrogenation of benzene

1993-09-02

1995-10-10

Gibson, Sharon A.

Chemistry of hydrocarbon compounds

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

Hydrocarbon is aromatic

585266, 585841, 585850, 208143, 208144, 208264, C07C 510, C07C 13465, C07C 710, C07C 7152

Patent

active

054572525

ABSTRACT:
A novel catalyst has been provided for the selective hydrogenation of benzene in gasoline. The catalyst mixture comprises a water-soluble, organo-metallic, selective benzene hydrogenation catalyst comprising catalytically-active mixture of (A) M[L].sub.x [X].sub.y wherein M is a metal selected from the group consisting of Cr, Fe, Co, Ni, Mo, Ru, Rh, Pd, Ta, W, Re, Os, Ir, Pt, La and Ce; L is an aromatic hydrocarbon, e.g., benzene, diphenyl, etc., or a diaromatic hydrocarbon, e.g., naphthalene; X is a halogen; x is an integer from 1 to 10 inclusive; and y is an integer from 1 to 10 inclusive; and (B) tris(triphenylphosphine)rhodium(I)halide or tris(triphenylphosphine)ruthenium(I)halide. In use the process comprises admixing the gasoline with water. The above-identified water-soluble, organo-metallic selective benzene hydrogenation catalyst mixture is then added. A catalytic hydrogenation is then carried out in a hydrogenation zone at a temperature of about 150.degree. to about 245.degree. C. at a pressure of up to about 1000 psi in a hipbasic system of the water and the gasoline. The benzene is selectively solubilized in the water and thus is selectively hydrogenated in the presence of the above-identified water soluble organo-metallic catalyst mixture. The gasoline is then recovered from the hydrogenation zone. This combination of both catalysts was found to produce conversions in excess of 40% which was much greater than either of the catalysts separately and at the lowest effective temperature of 150.degree. C.

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