Process for producing alkadienes

Details Process for producing alkadienes Process for producing alkadienes

C - Chemistry, Metallurgy

07

C

260/703

C07C 11/12 (2006.01) B01J 31/24 (2006.01) C07C 2/74 (2006.01)

Patent

CA 1140160

TITLE OF THE INVENTION Process for producing alkadienes ABSTRACT OF THE DISCLOSURE 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: Image (I) [wherein R1 is a substituted or unsubstituted C1-10 hydro- carbon group; R2 is H, a saturated aliphatic C1-5 hydro- carbon 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 and z are not zero concurrently and x + y + z = 3); A is -SO3M (M is a cation selected from among H, alkali metals, alkaline earth metals and NH4) or the formate or an inorganic acid salt of Image (R3 and R4 each means a saturated aliph- atic C1-4 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. `:;

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