کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10274823 | 461735 | 2011 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Kinetics of asphaltene thermal cracking and catalytic hydrocracking
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
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چکیده انگلیسی
A pentane-insoluble asphaltene was processed by thermal cracking and catalytic hydrocracking over NiMo/γ-Al2O3 in a microbatch reactor at 430 °C. Kinetic analysis shows that the first-order kinetics fits the data of conversion in reaction times â¤Â 30 min approximately, but deviates from the data of times over 30 min significantly; whereas the second-order kinetics fits the data of the reaction times up to 60 min adequately, to give the apparent rate constants of 1.704 Ã 10â2 and 9.360 Ã 10â2 wt fracâ1minâ1 for the two cracking processes. Furthermore, a three-lump kinetic model is proposed to include parallel reactions of asphaltenes to produce liquid oil (k1) and gas + coke (k3), and consecutive reaction from liquid to gas + coke (k2). The evaluated value of k1 is 1.697 Ã 10â2 and 9.355 Ã 10â2 wt fracâ1minâ1, k2 is 3.605 Ã 10â2 and 6.347 Ã 10â3 minâ1 , and k3 is 6.934 Ã 10â5 and 4.803 Ã 10â5 wt fracâ1minâ1 for asphaltenes thermal cracking and catalytic hydrocracking, respectively. Selectivity analysis shows that the catalytic hydrocracking process promotes liquid production and inhibits coke formation effectively.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Fuel Processing Technology - Volume 92, Issue 5, May 2011, Pages 977-982
Journal: Fuel Processing Technology - Volume 92, Issue 5, May 2011, Pages 977-982
نویسندگان
Yingxian Zhao, Ying Yu,