Process for isomerizing linear olefins to isoolefins

Details Process for isomerizing linear olefins to isoolefins Process for isomerizing linear olefins to isoolefins

C - Chemistry, Metallurgy

07

C

C07C 11/02 (2006.01) B01J 29/04 (2006.01) B01J 29/18 (2006.01) B01J 29/65 (2006.01) B01J 29/85 (2006.01) C07C 5/27 (2006.01) C07C 41/06 (2006.01) C07C 43/04 (2006.01)

Patent

CA 2070595

This invention provides a process to convert linear alkenes such as butene-1 and butene-2 to methyl branched chain alkenes such as isobutylene using one dimensional, medium pore zeolite catalysts and similar type catalysts such as SAPO's and MeAPOS's. The pore size for the catalyst should be greater than 0.42 nm and less than 0.7 nm, preferably with a larger dimension of between 0.5 and 0.6 nm. This pare size allows the branched chain alkenes to form and diffuse out of the catalyst while reducing the formation of unwanted by-products, including dimers, trimers, aromatics and coke. This invention has been demonstrated with H-ferrierite, SAPO-11, and magnesium mordenite in a laboratory scale reactor. Selectivities ranging from about 50% to almost 100% were demonstrated for isobutylene formation using H-ferrierite, at temperatures ranging from about 340°C to about 440°C.

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