Method for preparing polyphenyls
AssigneeTexaco Development Corporation
InventorRobert M. Suggitt
Life of this patent
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Abstract
Polyphenyls including biphenyl and terphenyl, are prepared by hydroalkylation of a charge benzene, dehydrogenation of hydroalkylate, and separation of desired product polyphenyls.
Claims13
The method which comprises hydroalkylating a charge monocyclic aromatic hydrocarbon stream with a hydroalkylating quantity of hydrogen in the presence of hydroalkylation catalyst at hydroalkylation conditions thereby forming a hydroalkylate product stream containing naphthenyl benzenes;
- dehydrogenating, in the presence of dehydrogenating catalyst at dehydrogenation conditions, a dehydrogenation charge stream containing at least a portion of the naphthenyl benzenes in said hydroalkylate product and at least one diluent-carrier selected from the group consisting of benzene, cyclohexylbenzenes, methylcyclopentane, cyclohexane, toluene, xylene, and mixtures thereof, thereby forming a dehydrogenated product stream containing polyphenyls in diluent-carrier, said diluent-carrier being of lower molecular weight than said product polyphenyls;
- and recovering said polyphenyls from said dehydrogenated product stream.
The method which comprises hydroalkylating a charge benzene stream with a hydroalkylating quantity of hydrogen in the presence of hydroalkylation catalyst at hydroalkylation conditions thereby forming a hydroalkylate product stream containing unconverted benzene and naphthenyl benzenes;
- dehydrogenating, in the presence of dehydrogenating catalyst at dehydrogenation conditions, a dehydrogenation charge stream containing at least the naphthenyl benzenes in said hydroalkylate product and a dehydrogenated product-solubilizing amount of benzene, thereby forming a dehydrogenated product stream containing polyphenyls in benzene;
- and recovering said polyphenyls from said dehydrogenated product stream.
The method which comprises hydroalkylating a charge benzene stream with a hydrogen partial pressure of 50 to 1500 psig in the presence of hydroalkylating catalyst at temperature of 80.degree.-200.degree.C and pressure of 50-1500 psig thereby forming a hydroalkylate product stream containing (i) unconverted benzene and (ii) cyclohexyl benzene;
- flashing at least a portion of said unconverted benzene from said hydroalkylate product stream in a first flashing operation thereby forming a first flashed hydroalkylate product stream containing a dehydrogenated product-solubilizing amount of benzene;
- dehydrogenating said first flashed hydroalkylate product stream containing said dehydrogenated product-solubilizing amount of benzene at 700.degree.-1100.degree.F and total pressure of 0-1000 psig thereby forming a fluid dehydrogenated product stream containing polyphenyls in benzene;
- separating said benzene from said dehydrogenated product stream;
- and recovering said polyphenyls from said product stream.
The method which comprises
- dehydrogenating, in the presence of dehydrogenating catalyst at dehydrogenation conditions, a dehydrogenation charge stream containing a naphthenyl benzene and at least one diluent-carrier selected from the group consisting of benzene, cyclohexyl benzene, methyl cyclopentane, cyclohexane, toluene, xylene, and mixtures thereof thereby forming a dehydrogenated product stream containing polyphenyls in diluent-carrier, said diluent-carrier being of lower molecular weight than said polyphenyls;
- and
- recovering said product stream.
The method which comprises
- dehydrogenating, in the presence of dehydrogenating catalyst at dehydrogenation conditions, a dehydrogenation charge stream containing a cyclohexyl benzene and, as a diluent-carrier, benzene thereby forming a dehydrogenated product stream containing biphenyl and benzene;
- separating said benzene from said product stream;
- and
- recovering said product stream containing biphenyl.
The method which comprises
- dehydrogenating, in the presence of dehydrogenating catalyst at dehydrogenation conditions, a dehydrogenation charge stream containing a dicyclohexyl benzene and, as a diluent-carrier, benzene or a cyclohexyl benzene thereby forming a dehydrogenated product stream containing terphenyl and diluent-carrier;
- separating said diluent-carrier from said product stream;
- and
- recovering said product stream containing terphenyl.
Dependencies are inferred from the claim text.