C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/683
C07C 2/00 (2006.01) C07C 2/72 (2006.01)
Patent
CA 1049050
ABSTRACT OF THE DISCLOSURE In the process for preparing monoalkenylbenzenes by reacting an alkylbenzene and a C4-C5 conjugated diene in the presence of an alkali metal catalyst while passing the reactants progressively through a series of successive reaction zones sub- stantially isolated from each other under non-back-flow condi- tions, the reaction being carried out at this time while feeding said alkylbenzene and alkali metal catalyst to the first reaction zone and the conjugated diene separately to at least two of said zones, and thereafter withdrawing the reaction product from the final reaction zone of said series; the improvement which comprises (1) reacting the reactants including the alkylbenzene, C4-C5 conjugated diene and alkali metal catalyst under boiling conditions in at least one of the reaction zones selected from the second and subsequent reaction zones; and (2) recovering the evaporated product from said reaction zone or zones as a liquid and recycling same to a reaction zone preceding that at which the product was evaporated. -1-
228304
Iwata Kazumi
Shima Takeo
Tokashiki Michiyuki
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