Cyclohexane environmental impact

The environmental impact of the cyclohexane oxidation could also be reduced. An alternative is to start from benzene and make a selective hydrogenation to form cyclohexene. Ru-based supported catalysts working in the liquid phase and in the presence of a co-catalysts such as Zn (Asahi Chemical Industry process) are selective in the reaction, with yields up to about 60% [247], but with cyclohexane as the main by-product. Cyclohexene is hydrated in the liquid phase with an MFI zeolite as catalyst at moderate temperature (100-130 °C). This reaction is very selective (>99%). This route was primarily developed for the synthesis of adipic acid, but could be used also to reduce the number of products and separation costs in the production of cyclohexanone. 

CNTs Oxidation of cyclohexane with O2 to cyclohexanol, cyclohexanone Oxygen Redox metal used to synthesize CNTs The advantages of lower environmental impact (NO and NjO emissions) and corrosion problems The yields (<70%) lower than those obtained using HNO3 The quality produced is poor [130,131]... 

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