Reaction Kinetic ofá-methylstyrene (AMS) Hydrogenation

Abstract

In this research hydrogenation kinetic of alpha-methylstyrene (AMS) on Pd/Al 2 O 3 catalyst was studied. The reaction is mildly exothermic (∆H=-109 kJ/mol). Intrinsic kinetic law was investigated under wide range of operating conditions 0.1 and 0.2 gm catalyst loading, 0.5-100 wt% AMS, 10, 15 and 20 bar pressure and 343-373 K temperature. The experiment data are fitted to estimate the kinetic parameters for different reaction mechanisms by using ACM (Aspen Custom Modeler) software. Finally the results of produced reaction mechanisms are compared with experimental results to obtain the optimum reaction mechanism. ‫ﺩﺭﺍﺴﺔ‬ ‫ﺴﺘﺎﻴﺭﻴﻥ‬ ‫ﺍﻻﻟﻔﺎﻤﻴﺜﻴل‬ ‫ﻫﺩﺭﺠﺔ‬ ‫ﺘﻔﺎﻋل‬ ‫ﻤﻴﻜﺎﻨﻴﻜﻴﺔ‬ ‫ﺍﻟﺨﻼﺼﺔ‬ ‫ﺴﺘﺎﻴﺭﻴﻥ‬ ‫ﺍﻟﻔﺎﻤﻴﺜﻴل‬ ‫ﻟﻤﺎﺩﺓ‬ ‫ﺍﻟﻬﺩﺭﺠﺔ‬ ‫ﺘﻔﺎﻋل‬ ‫ﻤﻴﻜﺎﻨﻴﻜﻴﺔ‬ ‫ﺩﺭﺍﺴﺔ‬ ‫ﺘﻤﺕ‬ ‫ﺍﻟﺒﺤﺙ‬ ‫ﻫﺫﺍ‬ ‫ﻓﻲ‬) (α-methylstyrene ‫ﻋﻠﻰ‬ ‫ﻨﻭﻉ‬ ‫ﻤﻥ‬ ‫ﻤﺴﺎﻋﺩ‬ ‫ﻋﺎﻤل‬ ‫ﺴﻁﺢ‬ Pd/Al 2 O 3 ‫ﻓﻲ‬ ‫ﻭﺍﺴﻊ‬ ‫ﻤﺩﻯ‬ ‫ﺍﻟﺘﺸﻐﻴﻠﻴﺔ‬ ‫ﺍﻟﻅﺭﻭﻑ‬ ‫ﻤﻥ‬. ‫ﺍﻟﻤﺴﺎﻋﺩ‬ ‫ﺍﻟﻌﺎﻤل‬ ‫ﻜﻤﻴﺔ‬ ‫ﻜﺎﻨﺕ‬ ‫ﺤﻴﺙ‬ 0.1 , 0.2 ‫ﺴﺘﺎﻴﺭﻴﻥ‬ ‫ﺍﻟﻔﺎﻤﻴﺜﻴل‬ ‫ﻟﻤﺎﺩﺓ‬ ‫ﺍﻟﻭﺯﻨﻴﺔ‬ ‫ﻭﺍﻟﻨﺴﺒﺔ‬ ‫ﻏﻡ‬ 0.5-100 % ‫ﻜﺎﻨﺕ‬ ‫ﺍﻟﻤﺴﺘﺨﺩﻤﺔ‬ ‫ﻭﺍﻟﻀﻐﻭﻁ‬ ‫ﻭﺯﻥ‬ 10 , 15 , 20 ‫ﺍﻟﺤﺭﺍﺭﺓ‬ ‫ﺩﺭﺠﺔ‬ ‫ﻭ‬ ‫ﺒﺎﺭ‬ 343-373 ‫ﻜﻠﻔﻥ‬. ‫ﺘﺒﻠﻎ‬ ‫ﺤﻴﺙ‬ ‫ﻤﻌﺘﺩل‬ ‫ﺒﺸﻜل‬ ‫ﺒﺎﻋﺙ‬ ‫ﺘﻔﺎﻋل‬ ‫ﻫﻭ‬ ‫ﺍﻟﻬﺩﺭﺠﺔ‬ ‫ﺘﻔﺎﻋل‬ ‫ﺃﻥ‬ ‫ﻋﻠﻤﺎ‬ ‫ﺍﻟﺘﻔﺎﻋل‬ ‫ﻁﺎﻗﺔ‬) H ∆ = 109 ‫ﻜﻴﻠﻭﺠﻭل‬ / ‫ﻤﻭل‬ .(‫ﺒﺭﻨﺎﻤﺞ‬ ‫ﺒﺎﺴﺘﺨﺩﺍﻡ‬ ‫ﺍﻟﻌﻤﻠﻴﺔ‬ ‫ﺍﻟﻨﺘﺎﺌﺞ‬ ‫ﻋﻠﻰ‬ ‫ﺒﺎﻻﻋﺘﻤﺎﺩ‬ ‫ﺍﻟﻤﻘﺘﺭﺤﺔ‬ ‫ﻟﻠﻤﻴﻜﺎﻨﻴﻜﻴﺎﺕ‬ ‫ﺍﻟﺨﺎﺼﺔ‬ ‫ﺍﻟﺜﻭﺍﺒﺕ‬ ‫ﺤﺴﺎﺏ‬ ‫ﺘﻡ‬) Aspen (Custom Modeler. ‫ﻭﺒﻌ‬ ‫ﺍﻟﻤﻴﻜﺎﻨﻴﻜﻴﺎﺕ‬ ‫ﻨﺘﺎﺌﺞ‬ ‫ﻤﻊ‬ ‫ﺍﻟﻌﻤﻠﻴﺔ‬ ‫ﺍﻟﻨﺘﺎﺌﺞ‬ ‫ﻤﻘﺎﺭﻨﺔ‬ ‫ﺘﻤﺕ‬ ‫ﺍﻟﻨﻬﺎﻴﺔ‬ ‫ﻓﻲ‬ ‫ﺩﻫﺎ‬ ‫ﺃﺤﺴﻥ‬ ‫ﺍﺨﺘﻴﺎﺭ‬ ‫ﺘﻡ‬ ‫ﺍﻟﺨﻁﺄ‬ ‫ﻤﻥ‬ ‫ﻨﺴﺒﺔ‬ ‫ﺍﻗل‬ ‫ﺘﻌﻁﻲ‬ ‫ﻭﺍﻟﺘﻲ‬ ‫ﻤﻴﻜﺎﻨﻴﻜﻴﺔ‬ .