Abstract:
JET FUELS WHICH HAVE BOTH A HIGH HEAT CONTENT AND AN ACCEPTABLE LOW TEMPERATURE VISCOSITY ARE PREPARED BY THE HYDROALKYLATION OF MONONUCLEAR AROMATIC HYDROCARBON FRACTIONS. BENZENE, TOLUENE, AND UNDEX EXTRACT, AND MIXTURES THEREOF, ARE THE PREFERRED STARTING MATERIALS. THESE ARE HYDROALKYLATED BY REACTION AT ABOUT 30*-250*C. UN DER SUPER-ATMOSPHERIC PRESSURE OF ABOUT 20-70 ATMOSPHERES OF HYDROGEN, THUS PRODUCING HYDROALKYLATES CONTAINING CYCLOALKYL-SUBSTITUTED BENZENES, METHYLCYCLOHEXYLSUBSTITUTE TOLUENS AND THE LIKE. THESE ARE FURTHER REDUCED TO THE CORRESPONDING CYCLOALKYL-SUBSTITUTED CYCLOHEXANES, TOGETHER WITH METHYLCYCLOHEXYL METHYLCYCLOHEXANES AND METHYLCYCLOHEXANE WHEN TOLUENE IS USED, AND THE REDUCTION PRODUCTS ARE ADJUSTED TO A FINAL DESIRED HEAT CONTENT AND LOW TEMPERATURE VISCOSITY BY STRIPPING OFF OR ADDING METHYLCYCLOHEXANE. THE PREFERRED CATALYST IS FINELY DIVIDED NICKEL ON A SUPPORT CONTAINING BOTH A ZEOLITE AND A SILICA-ALUMINA CRACKING CATALYST.
Abstract:
1. THE METHOD OF HYDROALKYLATING A CHARGE MONONUCLEAR AROMATIC HYDROCARBON WITH A HYDROALKYLATING QUANTITY OF HYDROGEN WHICH COMPRISES PASSING SAID CHARGE HYDROCARBON AND SAID HYDROALKYLATION ING QUANTITY OF HYDROGEN THROUGH A HYDROALKYLATION OPERATION AT HYDROALKYLATING CONDITIONS IN THE PRESENCE OF A HYDROALKYLATION CATALYST CONTAINING (A) A CRYSTALLINE ALUMINOSILICATE, AT LEAST A PORTION OF THE METAL CATION CONTENT OF WHICH IS RARE EARTH METAL INTRODCED BY BASE EXCHANGE AND (B) COBALT OR NICKEL THEREBY FORMING A PRODUCT STREAM CONTAINING HYDROALKYLATE; AND RECOVERING SAID PRODUCT STREAM CONTAINING HYDROALKYLATE.
Abstract:
A method for the catalytic hydroalkylation of an aromatic hydrocarbon. An aromatic hydrocarbon, for example, benzene is contacted with hydrogen and a dual function catalyst at hydroalkylation conditions including a temperature within the range of about 200* to 450* F. and at a hydrogen pressure of at least one atmosphere. The dual function catalyst comprises rhenium and an acidic oxide support. The acidic oxide support may be a silica-alumina cracking catalyst or a substantially alkali metal-free mixture of about 5 to 60 percent by weight of a crystalline zeolite and about 95 to 40 percent by weight of an alumina or a silica-alumina cracking catalyst. The hydrogenation activity of the rhenium may be modified by the inclusion of a Group VIII metal, a Group VI metal or their mixtures. Before use the composite catalyst is calcined at a temperature within the range of about 800* to 1500*F. and is reduced with hydrogen at a temperature within the range of about 400* to 1200*F. The process is useful in the hydroalkylation of benzene to prepare cyclohexylbenzene.
Abstract:
A method for the catalytic hydroalkylation of an aromatic hydrocarbon. An aromatic hydrocarbon, for example, benzene is contacted with hydrogen and a dual function catalyst at hydroalkylation conditions including a temperature within the range of about 110* to 450* F. and at a hydrogen pressure of at least one atmosphere. The dual function catalyst comprises a Group VIII metal or metal compound selected from the group consisting of nickel, cobalt and palladium and an acidic oxide suppport consisting essentially of a substantially alkali metalfree mixture of about 5 to 60 percent by weight of a crystalline zeolite and about 95 to 40 percent by weight of a silica-alumina cracking catalyst. Preferred Group VIII metals include nickel and palladium. The hydrogenation activity of the Group VIII metal may be modified by the inclusion of tungsten. Before use the composite catalyst is calcined at a temperature within the range of about 800* to 1,500* F. and is reduced with hydrogen at a temperature within the range of about 400* to 1,200*F. The process is useful in the hydroalkylation of benzene to prepare cyclohexylbenzene.
Abstract:
Separation of cyclohexylbenzene hydroperoxide from, for example, a mixture of cyclohexylbenzene and its oxidation products is accomplished by extraction of the oxidation products by means of polyurethane foam. Separation of the oxidation products is achieved in a two step desorption operation.
Abstract:
A method for the catalytic hydroalkylation of an aromatic hydrocarbon. An aromatic hydrocarbon, for example, benzene is contacted with hydrogen and a dual function catalyst at hydroalkylation conditions including a temperature within the range of about 110* to 450* F. and at a hydrogen pressure of at least one atmosphere. The dual function catalyst comprises a Group VIII metal or metal compound selected from the group consisting of nickel, and cobalt and an acidic oxide support consisting essentially of a silica-alumina cracking catalyst. A preferred Group VIII metal is nickel. The hydrogenation activity of the Group VIII metal may be modified by the inclusion of tungsten. Before use the composite catalyst is steamed at a temperature within the range of about 800* to 1400* F. and is reduced with hydrogen at a temperature within the range of about 400* to 1200* F. The process is useful in the hydroalkylation of benzene to prepare cyclohexylbenzene.