Effect of Pressure on Ethane Dehydrogenation in MFI Zeolite Membrane ReactorClick to copy article linkArticle link copied!
- Shailesh DangwalShailesh DangwalSchool of Chemical Engineering, Oklahoma State University, Stillwater, Oklahoma 74078, United StatesMore by Shailesh Dangwal
- Ruochen LiuRuochen LiuSchool of Chemical Engineering, Oklahoma State University, Stillwater, Oklahoma 74078, United StatesMore by Ruochen Liu
- Savannah Vaughn KirkSavannah Vaughn KirkSchool of Chemical Engineering, Oklahoma State University, Stillwater, Oklahoma 74078, United StatesMore by Savannah Vaughn Kirk
- Seok-Jhin Kim*Seok-Jhin Kim*E-mail: [email protected]School of Chemical Engineering, Oklahoma State University, Stillwater, Oklahoma 74078, United StatesMore by Seok-Jhin Kim
Abstract
Using a membrane reactor (MR) for producing ethylene by ethane dehydrogenation (EDH) reaction is an effective process. Compared with packed bed reactors (PBR), the EDH MR effectively surpasses the equilibrium limit by timely removing H2. A packed bed membrane reactor (PBMR) with a Pt/Al2O3 catalyst was used to investigate the effect of pressure on the EDH reaction. The EDH reaction was performed in the PBMR for the pressure and temperature range of 1–5 atm and 500–600 °C, respectively. With an increase in reaction temperature, the reaction rate increased which caused higher ethane conversion. Increasing the reaction pressure helped in enhancing H2 permeation across the membrane, which significantly increased the ethane conversion. The equilibrium limit of ethane conversion was successfully surpassed by increasing temperature and reaction pressure in the PBMR. Ethane conversion and ethylene selectivity as high as 29% and 97% were obtained at 600 °C and 5 atm for PBMR while corresponding values were 7% and 75% for PBR. The timely removal of H2 from the reaction side also helped in reducing methane formation as H2 is required for the methanation to occur. In addition, a 1D plug flow model was developed, and the values for ethane conversion obtained from the model were validated with experimental results. The same model was used to evaluate the ethane conversion beyond the experimental conditions, showing ethane conversion >90% could be obtained.
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