کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10161320 | 303 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Gas hold-up and oxygen transfer in a draft-tube airlift bioreactor with petroleum-based liquids
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
بیو مهندسی (مهندسی زیستی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Gas hold-up (Ég) and volumetric gas-liquid oxygen transfer coefficient (kLa) in a draft-tube airlift bioreactor (24 Ã 10â3 m3 in volume) were studied using pure kerosene and diesel and their water-in-oil microemulsions, as the model solutions for petroleum biodesulfurization. For comparison, experiments were also done with distilled water. The Ég and the kLa values for kerosene and diesel systems were in most cases significantly higher than the water system. Increase in water-to-oil phase volume ratio (Ï) of the microemulsion systems resulted in decrease in the values of Ég, which was attributed to a decrease in the coalescence-inhibiting tendency of the petroleum liquids. Increase in the viscosity (v) of the microemulsion systems to around 32 Ã 10â6 m2/s resulted in the occurrence of the churn turbulent regime with an associated decrease in the value of Ég, which could not be solely accounted for by the increase in Ï. Furthermore, the kLa values decreased with increase in the viscosity of the petroleum-based liquids. However, when churn turbulent conditions prevailed, increase in viscosity alone could not account for the decrease observed in the kLa values. Empirical correlations were developed that related Ég and kLa to Ï and ν, respectively, under the bubbly flow regime inside the bioreactor.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biochemical Engineering Journal - Volume 22, Issue 2, January 2005, Pages 105-110
Journal: Biochemical Engineering Journal - Volume 22, Issue 2, January 2005, Pages 105-110
نویسندگان
Mohammad Reza Mehrnia, Jafar Towfighi, Babak Bonakdarpour, Mohammad Mehdi Akbarnejad,