اسیدزدایی از روغن های گیاهی با استفاده از تقطیر مولکولی مسیر کوتاه: مدل سازی و شبیه سازی

نوع مقاله : مقاله پژوهشی

نویسندگان

پژوهشکده فناوری های شیمیایی، سازمان پژوهش های علمی و صنعتی ایران، تهران، ایران

چکیده

تصفیه فیزیکی روغن‌های گیاهی به منظور به دست آوردن روغن‌های سالم‌تر، اجتناب از افت روغن و کاهش ضایعات تصفیه دارای کاربرد است. اسیدزدایی یا جداسازی اسیدهای چرب آزاد یک مرحله ضروری در تصفیه فیزیکی روغن‌های گیاهی است. هدف پژوهش حاضر توسعه مدل ریاضی بیان کننده رفتار اسیدزدایی روغن کاملینای پرس سرد و روغن زیتون لامپانت با استفاده از فناوری تقطیر مولکولی مسیر کوتاه (SPMD) به عنوان یک فناوری سازگار با محیط زیست (و بدون استفاده از حلال) بود. از معادلات موازنه جرم و لانگمویر به منظور بیان مکانیسم‌های تبخیر و جداسازی استفاده شد. به منظور ارزیابی کارایی مدل از شدت جریان‌های مختلف خوراک و دماهای تبخیر متفاوتی بهره گرفته شد. سایر فاکتورها مانند دمای خوراک، فشار، دمای میعان و سرعت پخش کننده ثابت بودند. به منظور پیش بینی فشار بخار، از روش سهم گروهی استفاده شد. مقادیر پیش بینی شده به صورت منطقی با نتایج آزمایشات تجربی سازگار بود. دماهای تبخیر بالاتر و شدت جریان‌های پایین‌تر منجر به بازده‌‌های اسیدزدایی بالاتری شدند. همچنین، از مدل پیشنهاد شده به منظور پیش بینی چگونگی تعییر محتوای اسیدهای چرب آزاد در طول ستون تقطیر کننده مولکولی مسیر کوتاه استفاده شد.

چکیده تصویری

اسیدزدایی از روغن های گیاهی با استفاده از تقطیر مولکولی مسیر کوتاه: مدل سازی و شبیه سازی

تازه های تحقیق

  • به منظور بیان رفتار اسیدزدایی روغن­های کاملینای پرس سرد و زیتون لامپانت به روش تقطیر مولکولی مسیر کوتاه (SPMD)، مدل­های ریاضی توسعه یافتند.
  • در مورد هر یک از روغن­های مذکور از طریق تعریف ضرایبی که به طرح SPMD و ویژگی­های خوراک بستگی داشتند، معادلات مربوط به مدل­های ریاضی مربوطه بیان شدند.
  • به منظور تعیین مقادیر ضرایب معادلات مربوطه از نتایج مربوط به آزمایشات تجربی استفاده شد.
  • در مورد هر دو روغن کاملینای پرس سرد و زیتون لامپانت اسیدزدایی شده، هماهنگی خوبی بین نتایج تجربی و نتایج حاصل از پیش بینی مدل­های ریاضی به دست آمد.
  • با استفاده از مدل­های توسعه یافته، چگونگی کاهش محتوای اسیدهای چرب در طول ستون SPMD محاسبه شد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Vegetable oils deacidification by short path molecular distillation: Modeling and simulation

نویسندگان [English]

  • Fariborz Seifollahi
  • Mohammad H. Eikani
  • Nahid Khandan
Department of Chemical Technologies, Iranian Research Organization for Science and Technology (IROST), P.O. Box: 33535111, Tehran, Iran
چکیده [English]

Physical refining of vegetable oils suggests achieving healthier oils, avoiding excessive oil loss, and reducing production waste. Deacidification or removal of free fatty acids (FFA) is a vital step in the physical refining of vegetable oils. This study aimed to develop a mathematical model that shows the deacidification behavior of cold-pressed camelina oil and lampante olive oil using short-path molecular distillation (SPMD) as a solventless and green technology. Mass conservation balance along with the Langmuir equation were used to describe the evaporation and separation mechanisms. For the oil samples, evaluation of the model prediction capabilities was assessed at different feed flow rates (Q) and evaporation temperatures (ET) while other factors included. feed temperature, vacuum pressure, condensation temperature, and wiper speed were kept constant. To predict vapor pressure, the group contribution method was applied. The model predictions were in reasonable agreement with the experimental data, and showed that higher ET and lower Q led to higher deacidification efficiency. Additionally, the proposed model can be used for determining FFA concentration at different longitudinal parts of the SPMD column.

کلیدواژه‌ها [English]

  • Short path molecular distillation (SPMD)
  • Deacidification
  • Mathematical modeling
  • Simulation
  • Lampante olive oil
  • Camelina oil
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