Continuous Process for preparing 4,4'-diisopropylbiphenyl
A continuous flow process has been discovered for the highly selective isopropylation of biphenyl to 4,4'-diisopropylbiphenyl. Thus biphenyl and propene in decalin are passed through a solid catalyst bed contained in a flow reactor at moderate temperature (220 DEG C) and pressure (10-30 atm) to...
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| creator | YUSHCHENKO, VALENTINA VICTOROVNA SOLOVEICHIK, GRIGORII LEV IVANOVA, IRINA IGOREVNA KUZNETSOV, ANDREI SERGEEVICH KNYAZEVA, ELENA EVGENIEVNA MOSKOVSKAYA, IRINA FEDOROVNA SMIRNOV, ANDREI VALENTINOVICH PONOMAREVA, OLGA ALEXANDROVNA |
| description | A continuous flow process has been discovered for the highly selective isopropylation of biphenyl to 4,4'-diisopropylbiphenyl. Thus biphenyl and propene in decalin are passed through a solid catalyst bed contained in a flow reactor at moderate temperature (220 DEG C) and pressure (10-30 atm) together with a continuous stream of nitrogen. The catalyst is an acidic zeolite catalyst having a molar ratio of SiO2 to Al2O3 in a range between about 20 to 1 and about 500 to 1. Optimal catalytic performance is achieved when 35% or more of the active sites in the catalyst have an activation energy of ammonia desorption in a range between about 145 kJ/mol and about 170 kJ/mol. Additional enhancements of catalyst performance can be achieved by pretreating the acidic zeolite catalyst with a volatile basic agent prior to the alkylation reaction. |
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| subjects | ACYCLIC OR CARBOCYCLIC COMPOUNDS APPARATUS THEREFOR CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY GENERAL METHODS OF ORGANIC CHEMISTRY METALLURGY ORGANIC CHEMISTRY PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL THEIR RELEVANT APPARATUS TRANSPORTING |
| title | Continuous Process for preparing 4,4'-diisopropylbiphenyl |
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