کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10278759 464582 2005 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Degradation kinetics of monosaccharides in subcritical water
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Degradation kinetics of monosaccharides in subcritical water
چکیده انگلیسی
The degradation kinetics of the monosaccharides of both the aldohexose (glucose, galactose and mannose) and ketohexose (fructose and sorbose) types in subcritical water were studied using a tubular reactor in the temperature range of 180-260 °C and at a constant pressure of 10 MPa. The relationship between the fraction of unreacted monosaccharide and the residence time could be expressed by the Weibull equation for all the monosaccharides at any temperature. The susceptibility to degradation was quite different among the saccharides. The activation energy and frequency factor were calculated from the Arrhenius equation and the enthalpy-entropy compensation was found to hold for the degradation of monosaccharides in subcritical water. The isokinetic temperature was similar to that for the hydrolysis of disaccharide. The conversion to 5-hydroxymethy-2-furaldehyde (HMF) and the decrease in pH of the effluent solution were measured and it was found that fructose had the highest value for both.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Food Engineering - Volume 68, Issue 3, June 2005, Pages 309-313
نویسندگان
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