Olefin production process

C - Chemistry – Metallurgy – 07 – C

Patent

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Details

260/707.9

C07C 11/02 (2006.01) C07C 2/18 (2006.01)

Patent

CA 1081262

OLEFINE PRODUCTION PROCESS Abstract of the Disclosure This invention describes a process for producing branched C7-C9-mono-olefines by polymerizing a mixture of propylene and butenes over phosphoric acid catalysts. The invention is characterized in that (A) a stream comprising propylene, butenes and recycled olefines beyond C9 is fed to one end of an adiabiatic reaction zone containing the catalyst; (B) the operation is carried out in said zone at a temperature of 160° to 300°C and under a pressure such as to maintain the reagents and reaction products in the homogeneous liquid phase, until at least 30% but not more than 70% of the fed propylene and butenes has been converted (C) the reaction products are recovered at the other end of the reaction zone, and the unaltered propylene and butenes, the C6 olefines, the C7-C9 fraction and the fraction beyond C9 are separated; (D) the latter fraction is wholly or at least partially recycled to that end of the reaction zone to which the reagents are fed, and if required the unaltered propylene and butenes are recycled to the same end. In this way, rapid deactivation of the catalyst and the formation of "hot points" can be avoided.

283502

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