Process for producing alkadienes

Details Process for producing alkadienes Process for producing alkadienes

1980-09-04

1982-06-08

Gantz, Delbert E.

Chemistry of hydrocarbon compounds

Unsaturated compound synthesis

By addition of entire unsaturated molecules, e.g.,...

585511, 585514, C07C 1112

Patent

active

043341179

ABSTRACT:
This invention provides an improved process for producing alkadienes which comprises (1) contacting butadiene or isoprene with a catalyst such as platinum or palladium or a compound of one of said metals in a sulfolane solution, in the presence of a tertiary lower alkylamine formate and at least one phosphine compound of the formula: ##STR1## wherein R.sup.1 is a substituted or unsubstituted C.sub.1-10 hydrocarbon group; R.sup.2 is H, a saturated aliphatic C.sub.1-5 hydrocarbon group, nitro or halogen; m is 1, 2 or 3; n is 0 or 1; x is 0, 1 or 2; y and z each is 0, 1, 2 or 3 (provided that y and z are not zero concurrently and x+y+z=3); A is --SO.sub.3 M wherein M is a cation selected from among H, alkali metals, alkaline earth metals and NH.sub.4 or the formate or an inorganic acid salt of ##STR2## wherein R.sup.3 and R.sup.4 each means a saturated aliphatic C.sub.1-4 hydrocarbon group in an amount of 4 to 200 moles per gram atom of the metal constituting the catalyst to form dimeric alkadienes; (2) separating the reaction mixture into an alkadiene-containing layer and a catalyst-containing layer; and (3) recycling the catalyst-containing layer to the alkadiene production process. The improved process makes it possible to maintain the catalytic activity over a prolonged period of time and to facilitate separation and reuse of the catalyst.

REFERENCES:
patent: 3732328 (1973-05-01), Wright
patent: 3823199 (1974-07-01), Wright
patent: 4020121 (1977-04-01), Kister et al.
patent: 4180694 (1979-12-01), Nozaki
patent: 4229605 (1980-10-01), Nozaki
patent: 4229606 (1980-10-01), Nozaki
patent: 4243829 (1981-01-01), Pittman

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