Add time:07/19/2019         Source:sciencedirect.com

Alkylation of biphenyl with propene was carried out at 250°C using H-mordenite as a catalyst. H-mordenite was selective for 4,4′-diisopropylbiphenyl(4,4′-DIPB) production. The 4,4′-DIPB selectivity, however, decreased with increasing level of biphenyl conversion, due to isomerization of 4,4′-DIPB to thermodynamically more favorable isomers. The external acid sites were selectively poisoned by treatment with tributylphosphite(TBP) since the molecular dimension of TBP was large compared with the pore size of mordenite. The isomerization of 4,4′-DIPB was suppressed by treatment of H-mordenite with TBP, resulting in enhanced selectivity for 4,4′-DIPB even at high levels of conversation.

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