Conversion of Isopropanol and Mixed Alcohols to Hydrocarbons Using HZSM-5 Catalyst in the MixAlco (TM) Process. Part 2: Studies at 5000 kPa (abs)
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2016 American Institute of Chemical Engineers. This study employed HZSM-5 (SiO2/Al2O3=280 mol/mol) to produce hydrocarbons from reagent-grade isopropanol and mixed alcohols made from lignocellulosic biomass (waste office paper and chicken manure) using the MixAlco process. All studies were performed at P=5000 kPa (abs). The experiments were conducted in two sets: (1) vary temperature (300-450C) at weight hourly space velocity (WHSV)=1.92 h-1, and (2) vary WHSV (1.92-11.52 h-1) at T=370C. For isopropanol at higher temperatures, the olefins undergo more cracking reactions to produce smaller molecules and more aromatics. At low temperatures, the molecules have less energy so they do not crack and therefore form larger molecules. At T=300C, the carbon distribution is bimodal at C9 and C12, which shows trimerization and tetramerization of propene. At 300C, propene was the only gas produced, cracking did not occur and therefore preserved high-molecular-weight molecules. For mixed alcohols, higher temperatures show significant catalyst deactivation; however, isopropanol did not show any catalyst deactivation.
