کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1265275 972207 2013 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Ultrasound assisted enzyme catalyzed transesterification of waste cooking oil with dimethyl carbonate
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Ultrasound assisted enzyme catalyzed transesterification of waste cooking oil with dimethyl carbonate
چکیده انگلیسی

This work reports the production of biodiesel with waste cooking oil and dimethyl carbonate in solvent free system through transesterification by immobilized enzyme (Novozym 435) under the influence of ultrasound irradiation. The experiments were conducted in an ultrasonic water bath under three different conditions i.e. ultrasonic irradiation (UI) without stirring, UI coupled with stirring and only stirring to compare their overall effects on fatty acid methyl esters (FAME) conversion. As compared with the conventional stirring method, where FAME conversion was 38.69% at 4 h, the UI without stirring significantly enhanced the conversion of enzymatic transesterification to 57.68% for the same reaction time. However the reaction rate was further increased under the condition of ultrasonication coupled with stirring and resulted into higher conversion of 86.61% for the same reaction time. Effects of reaction parameters, such as temperature, ratio of DMC/oil, speed of agitation and enzyme loading on the conversion were investigated. Furthermore, repeated use of Novozym 435 showed gradual decline in both conversion as well as enzyme activity.


► Ultrasound enhances the conversion of enzyme catalyzed trasesterification reaction.
► Ultrasound assisted transesterfication gives 86.61% conversion in 4 h.
► Enzyme can be recycled four times with a marginal loss in the enzyme activity.
► Ultrasound alone significantly enhanced the enzyme catalyzed conversion to 57.68%.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ultrasonics Sonochemistry - Volume 20, Issue 3, May 2013, Pages 900–905
نویسندگان
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