مدل سازی و بررسی پارامترهای تولید بیودیزل از هسته خرما به کمک روش های مرسوم، ماکروویو و فراصوت

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری، مکانیک بیوسیستم، دانشگاه فردوسی مشهد، مشهد

2 گروه بیوسیستم، دانشگاه فردوسی مشهد

3 دانشیار، مهندسی مکانیک بیوسیستم، دانشگاه فردوسی مشهد، مشهد

4 استادیار، مکانیک بیوسیستم، دانشگاه فردوسی مشهد، مشهد

چکیده

در این تحقیق، پارامترهای موثر بر میزان تولید بیودیزل از روغن هسته خرما به سه روش حرارت‌دهی مرسوم، ماکروویو و فراصوت بررسی شد. به­ منظور انجام فرایند تولید بیودیزل، ابتدا واکنش استری با کاتالیست اسید سولفوریک انجام شد تا میزان اسید چرب آزاد موجود در روغن هسته خرما به­ میزان استاندارد برای واکنش ترانس ‌استریفیکاسیون کاهش یابد. نتایج نشان داد که 1 درصد وزنی کاتالیست و نسبت مولی الکل به روغن 8 تا 9 میزان بهینه برای هر سه روش تولید بیودیزل بود. به ­عبارت دیگر، روش مورد استفاده تاثیری بر میزان کاتالیست و متانول مصرفی در فرایند نداشت. در روش حرارت‌دهی مرسوم دمای°C  56 به ­عنوان دمای بهینه انتخاب شد و توان تقریبا 300 وات، در هر دو روش ماکروویو و فراصوت، بالاترین بازده را فراهم کرد. اما تفاوت اصلی در کاهش زمان واکنش بود، به­ طوری که زمان واکنش از حدود 90 دقیقه برای رسیدن به نقطه تعادل در روش مرسوم به هفت­ونیم دقیقه در روش فراصوت و تنها 3 دقیقه در روش ماکروویو کاهش یافت. ازلحاظ مصرف انرژی، روش ماکروویو مناسب‌تر از روش فراصوت شناخته شد. نتایح مدل‌سازی نیز نشان داد که مدل‌های پیشنهادی مطابقت مناسبی با مقدار آزمایشگاهی دارند. نسبت مولی متانول/روغن و دما در روش مرسوم، میزان کاتالیست و متانول در روش ماکروویو، و توان امواج فراصوت در روش فراصوت، بیشترین تاثیر را بر تبدیل روغن هسته خرما به بیودیزل داشتند.

کلیدواژه‌ها

موضوعات


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