کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9623749 | 456583 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Gas-liquid mass transfer in a novel forced circulation loop reactor
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
A forced circulation pumped loop reactor is characterized for oxygen transfer in air-water system. Overall mass transfer coefficient (kLa) data are reported for airlift and forced circulation modes of operation, for liquid circulation rates of up to 2 m3/h. Highest values of oxygen transfer efficiency were attained at specific power input values of â¤100 W/m3 when the forced circulation rates were â¤0.5 m3/h. Higher values of forced circulation rate reduced mass transfer efficiency, but reactor was always more efficient than a propeller loop reactor. The kLa values obtained at high rates of pumped liquid circulation were substantially greater than could be attained in the airlift mode of operation. Forced circulation produced more uniform and small bubbles, compared to operation as an airlift reactor. At high rates of forced circulation (e.g. 2 m3/h), presence of relatively light (density = 931.8 kg/m3) suspended hydrophobic polypropylene particles (average diameter = 4.7 mm) at concentrations of 1.6 and 3.2% (v/v), barely affected kLa compared to solids-free operation. The reactor used had an aspect ratio of 6.2 and downcomer-to-riser cross-sectional area ratio of 0.032. The forced flow was injected in the annular riser zone.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Journal - Volume 112, Issues 1â3, 1 September 2005, Pages 73-80
Journal: Chemical Engineering Journal - Volume 112, Issues 1â3, 1 September 2005, Pages 73-80
نویسندگان
Ali Fadavi, Yusuf Chisti,