کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
230431 1427384 2014 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Macauba oil as an alternative feedstock for biodiesel: Characterization and ester conversion by the supercritical method
ترجمه فارسی عنوان
روغن مکوبو به عنوان یک منبع تغذیه برای بیودیزل: مشخص کردن و تبدیل استر به روش فوق بحرانی
کلمات کلیدی
روغن مکوبو، تولید بیودیزل، روش فوق بحرانی، فرآیند مداوم بدون کاتالیزور
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی


• Production of FAME and FAEE from Macauba oil through supercritical method.
• Physicochemical analysis of Macauba oil defined a convertibility parameter for reaction extent.
• Maximum reaction efficiencies of 98.0% for FAME and 86.9% for FAEE.

In this work different samples of Brazilian macauba oil obtained from mechanical pressing were characterized and production of esters of fatty acids using a catalyst-free continuous process under supercritical alcohols was assessed. Analysis of oil samples showed that the major fatty acid on pulp oil was oleic acid (mean value 62.8%), the amount of free fatty acid (FFA) was very high (37.4–65.4%), samples contained glycerides (7.4–16.5% TAG, 14.2–16.8% DAG and 1.0–3.4% MAG) and moisture was around 1.0%. Oil was processed in a continuous reactor using supercritical methanol or ethanol and the effects of temperature (573, 598, 623 and 648 K), pressure (10, 15 and 20 MPa), oil to alcohol molar ratio (1:20, 1:30 and 1:40), water concentration (0, 5 and 10 wt% added) and the flow rate of reaction mixture (1.0, 1.5, 2.0, 2.5 and 3.0 mL/min) on process efficiency were evaluated. The highest ester content achieved in reactions with supercritical methanol was 78.5% (648 K, 15 MPa, 1:30 oil:methanol molar ratio, 5 wt% water and 2.5 mL/min flow rate), while with supercritical ethanol was 69.6% (598 K, 15 MPa, 1:30 oil:ethanol molar ratio, 5 wt% water and 2.0 mL/min flow rate). The extent of the reaction was explored using a novel parameter, convertibility, which corresponds to the maximum ester content attainable from the feedstock. According to the convertibility of macauba pulp oil, the highest ester content corresponded to efficiencies of 98.0% and 86.9%, respectively. Results demonstrate that macauba oil might be a potential alternative for biodiesel production, though purification steps should be taken into account to achieve biodiesel specifications.

Ester yield from macauba oil via continuous esterification/transesterification reactions in supercritical alcohols at 15 MPa, 1:30 oil:alcohol molar ratio and 5 wt% water added to alcohol; (a) and (b) FAME yields and (c) and (d) FAEE yields. (Continuous lines are just to improve visualization).Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: The Journal of Supercritical Fluids - Volume 93, September 2014, Pages 130–137
نویسندگان
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