Hydrogenation process using noble metal catalysts promoted by li

Details Hydrogenation process using noble metal catalysts promoted by li Hydrogenation process using noble metal catalysts promoted by li

1976-12-07

1978-04-18

Levine, Herbert

Mineral oils: processes and products

Chemical conversion of hydrocarbons

Hydrogenation

260667, C07C 510, C10G 2304

Patent

active

040850358

ABSTRACT:
A process for the hydrogenation of unsaturated hydrocarbon fractions is described which comprises dissolving said unsaturated hydrocarbon fraction in a liquid acid system, said liquid acid system being selected from the group consisting of liquid HF, other liquid Bronsted acid containing fluorine, fluorine containing Friedel-Crafts catalyst (such as BF.sub.3, TaF.sub.5) in liquid HF or other liquid fluorine containing Bronsted acid and contacting the resulting solution with a catalyst selected from the group consisting of the elemental oxide and sulfide forms of platinum and iridium and the elemental and oxide forms of palladium promoted with a liquid acid system said liquid acid system being selected from the group consisting of liquid fluorine containing Bronsted acid and fluorine containing Friedel-Crafts catalyst in liquid fluorine containing Bronsted acid in a pressurized hydrogen atmosphere at a temperature sufficient to facilitate the reaction and avoid hydrocracking.
Hydrogenation using a liquid fluorine containing Bronsted acid promoted palladium system as catalyst has been found to be from 10 to 144 times more active than palladium by itself. Hydrogenation using palladium promoted by using a Friedel-Crafts catalyst containing fluorine in conjunction with a liquid fluorine containing Bronsted acid demonstrates an activity increase on the order of 3500 times. Using platinum or iridium promoted as described above results in a hydrogenation process which is tolerant to sulfur and therefore one highly attractive when dealing with heavy ends, resid, coal liquids or other high sulfur, difficult to process hydrocarbon feedstreams.
In the practice of the instant process, the liquid acid promoted platinum, palladium and iridium catalyst material may be supported on any material resistant to acid, carbon, charcoal, Teflon, (polytetrafluoroethylene) etc., meeting this requirement.

REFERENCES:
patent: 3409684 (1968-11-01), Aristoff et al.
patent: 3888937 (1975-06-01), Siskin et al.

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