Patent
Hydroalkylation catalyst and process
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TLDR
In this paper, a method for the catalytic hydroalkylation of an aromatic hydrocarbon is described, where benzene is contacted with hydrogen and a dual function catalyst at hydroalkylation conditions including a temperature within the range of about 200 DEG to 450 DEG F and at a hydrogen pressure of at least one atmosphere.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 DEG to 450 DEG 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 DEG to 1500 DEG F. and is reduced with hydrogen at a temperature within the range of about 400 DEG to 1200 DEG F. The process is useful in the hydroalkylation of benzene to prepare cyclohexylbenzene.read more
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Process for producing cyclohexylbenzene
TL;DR: In this article, a molecular sieve with an X-ray diffraction pattern including d-spacing maxima at 12.4 ± 0.25, 6.9± 0.15, 3.57±0.07 and 3.42± 0.07 Angstrom was used to produce cyclohexylbenzene.
Patent
Process for making cyclohexylbenzene
TL;DR: In this article, a process for making cyclohexylbenzene is described, and the process includes the following steps: (a) contacting benzene and hydrogen in the presence of a first catalyst under hydroalkylation conditions sufficient to form a first effluent stream having cycloenzene, cyclomethane, methyl cyclopentane, and unreacted benzene; (b) supplying at least part of the first effluve stream to a first separation system to divide the first stream part into a cycloencane/methylcyclopentane-
Patent
Selective partial hydrogenation of aromatics
TL;DR: Aromatics are selectively partially hydrogenated to substantial amounts of cyclic olefins by contacting the aromatics under hydrogenation conditions with hydrogen and with an aqueous dispersion of a solid ruthenium-containing catalyst promoted with a modifying amount of a transition metal as discussed by the authors.
Patent
Production and Use of 3,4' and 4,4'-Dimethylbiphenyl Isomers
Jihad M. Dakka,Lorenzo C. DeCaul,Keith H. Kuechler,Neeraj Sangar,Michael Salciccioli,Alan A. Galuska,Gary D. Mohr +6 more
TL;DR: In this article, a feed comprising toluene is contacted with hydrogen in the presence of a hydroalkylation catalyst under conditions effective to produce (methylcyclohexyl)toluenes.
Patent
Transalkylation of polycyclohexylbenzenes
TL;DR: In this paper, a feed containing at least one polycyclohexylbenzene is contacted with benzene under transalkylation conditions with a catalyst comprising a zeolite USY having a silica to alumina molar ratio in excess of 10.
References
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Patent
Hydrotreating of light cycle oils
Hilfman Lee,Pollitzer Ernest L +1 more
TL;DR: In this paper, a light cycle oil is converted to aromatic hydrocarbons with a single benzene nucleus using a catalytic catalyst at about 500-850 degrees F at a pressure of about 400-2000 psig.