Abstract:
A novel method for treating the radiant tubes of a fired pyrolysis heater with an antifoulant composition for inhibiting the formation and deposition of coke thereon. Such novel method includes introducing the antifoulant into the crossover conduit between the convection tubes and radiant tubes of the fired pyrolysis heater.
Abstract:
An aromatic hydrocarbon is contacted under suitable hydroalkylation conditions with a composition comprising a calcined, acidic, nickel and rare earth-treated crystalline zeolite.
Abstract:
Cobalt and gold in a ruthenium hydrogenation catalyst markedly increases the yield of product. A method for hydrogenating branched-chain olefinically unsaturated aliphatic dinitrile employing a ruthenium-cobalt-gold catalyst to produce saturated diamines is set forth.
Abstract:
An aromatic hydrocarbon is contacted under hydroalkylation conditions and in the presence of hydrogen with a catalyst comprising at least one ruthenium compound and at least one nickel compound supported on a calcined, acidic, rare earth-treated crystalline zeolite.
Abstract:
Compounds having the formula ##STR1## are prepared from a corresponding o-nitrophenol by blocking the hydroxyl groups via acetal formation, followed by reductive coupling and acid hydrolysis.
Abstract:
Unsaturated dinitriles are hydrogenated to saturated diamines using a rhodium catalyst on a silica support having a surface area larger than 275 m.sup.2 /g, a pore volume of from about 1.0 to 1.5 mL/g and an average pore size of from about 100 to about 175 A. The supported rhodium catalyst is prepared by a method which includes the steps of contacting a silica support having the characteristics described above with a solution or dispersion of rhodium or a reducible compound of rhodium, and then subjecting the impregnated silica support to vacuum treatment.
Abstract:
An aromatic hydrocarbon is contacted under hydroalkylation conditions and in the presence of hydrogen with a composition comprising at least one platinum compound supported on a calcined, acidic, nickel and rare earth-treated crystalline zeolite.
Abstract:
Aromatic hydrocarbons are converted to biaryl compounds in a two-step process comprising hydroalkylation of the aromatic hydrocarbons to cycloalkyl aromatic hydrocarbons followed by dehydrogenation in the presence of a metal dehydrogenation catalyst and an acidic support to convert the cycloalkyl aromatic hydrocarbons to biaryl compounds. In one embodiment, benzene is hydroalkylated to cyclohexylbenzene, and the cyclohexylbenzene then dehydrogenated to biphenyl.
Abstract:
Phenol-, cyclohexanone-, and cyclohexylbenzene-containing mixtures are extractively distilled employing an organic carbonate to provide overhead of high purity cyclohexanone and a kettle product substantially free of cyclohexanone and containing phenol, the organic carbonate, and, when present in the mixture, cyclohexylbenzene.
Abstract:
Naphthalene and alkylated naphthalenes are useful as sulfur-solubilizers in coating and sealant formulations based on polymercaptan-terminated polymers. In one embodiment, sealant and coating formulations are prepared by curing a mixture of (a) a polymercaptan-terminated polymer, (b) naphthalene or alkylated naphthalenes as sulfur-solubilizers containing dissolved sulfur, and (c) a curing agent.