گرانرو‌ی تحت فشار استر‌های اسید چرب و بیو‌دیزل‌ها با استفاده از یک مدل ترمودینامیکی نوین

نوع مقاله : علمی-پژوهشی

نویسندگان

1 بخش شیمی، دانشکده‌ی علوم پایه، دانشگاه هرمزگان، بندرعباس، ایران

2 بخش شیمی، دانشگاه صنعتی شیراز، شیراز، ایران

چکیده

در این پژوهش، یک مدل ترمودینامیکی نوین برای گرانرو­ی تحت فشار چندین  استر اسید­چرب و بیو­دیزل بر پایه­ ی نظریه اصطکاک ادغام شده با معادله­ حالت زنجیر سخت ـ دوتایی اختلال یافته، پیش بینی شدند. برای این منظور، پارامترهای مولکولی و همچنین دانسیته ی استر­های اسید­چرب و بیو­دیزل­ ها که در این مدل ترمودینامیکی مورد نیاز می­ باشد با استفاده از معادله حالت ذکر شده محاسبه شده اند. معادله حالت­ ذکر شده توانایی پیش بینی دانسیته و ضرایب تراکم پذیری ­هم دما را در بازه­ی دمایی 278 تا 393 کلوین و فشار تا 210 مگاپاسکال را دارا می باشد. سپس، مدل ترمودینامیکی مطرح شده (نظریه اصطکاک و معادله­ حالت گفته شده) برای پیش بینی گرانرو­ی چندین استر اسید­چرب و بیو­دیزل در بازه­ی دمایی 293 تا 393 کلوین و فشار تا حدّ 200 مگاپاسکال به کار گرفته شد. این مدل، توانایی پیش بینی 892 نقطه از داده های تجربی گرانرو برای 10 استر اسید­چرب و 3 بیو­دیزل با انحراف ­نسبی مطلق میانگین برابر با 70/1 درصد را دارا می باشد. همچنین، میزان دقّت و صحّت مدل ترمودینامیکی مطرح شده با تعدادی از مدل­ های نیمه نظریه و تجربی مورد مقایسه قرار گرفت. نتیجه های مقایسه، برتری مدل نظریه اصطکاک در برابر دیدگاه های نام­ برده ­شده را آشکار ساخت.

کلیدواژه‌ها

موضوعات

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