DEHEYDROGENATION OF CYCLOHEXANE IN A PALLADIUM-CERAMIC MEMBRANE REACTOR BY EQUILIBRIUM SHIFT

Historically Black College and University and Other Minority Institutions

Ananda M.Mondal ; Shamsuddin Ilias

PID  :  25513

来源: CEUR

【 摘 要 】

Using electroless deposition of palladium thin-films on a microporous ceramic substrate, we developed a hydrogen-selective palladium-ceramic composite membrance. The new membrance has significantly higher permeability and selectivity for hydrogen than many of the commercially available dense-metallic membrane. Thehydrogen permeability of the new membrane increases with increasing temperature. These properties make it an ideal candicate for use in membrane-reactors to study dehydrogenation reactions by equilibrium shift. To investigate the usefulness of the new membrane in membrane reactor-separator configuration,a model for studying dehydrogenation of cyclohexane by equilibrium in a membrane reactor is developed. Radial diffusion is considered to account for the concentration gradient in the radial direction due to permeation through the membrane. The model is investigated with and without the reaction.In the non-reaction case, a mixture of argon,benzene,cyclohexane,and hydrogen is used in the reaction side and argon is used in the separation side.In the case of dehydrogenation reaction,the feed stream to the reaction side contained hydrogen and argon while in the separation side argon is used as sweep gas.Equilibrium conversion for dehydrogenation of cyclohexane is 18.7%. Present study shows that 100% conversion can be achieved by equilibrium shift using Pd-Ceramic membrane reactor.For a feed containing cyclohexane and argon of 1.64×10 and 1.0×10 mol/s, 98% conversion is achieved.