بررسی اثر برخی پارامترهای مهم در تولید بیودیزل با استفاده از کاتالیست ناهمگن پتاسیم کربنات/آلومینا و روغن کلزا

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشگاه علم و فناوری مازندران

2 استادیار، مهندسی شیمی، پژوهشگاه استاندارد، گروه پژوهشی پتروشیمی، البرز،

3 دانشگاه علم وفناوری مازندران

چکیده

سوخت زیستی بیودیزل، به­دلیل مزایای زیست­ محیطی و شباهت برخی خصوصیات آن با نفت­ گاز، به­عنوان جایگزینی مناسب برای سوخت­های فسیلی مورد توجه است. در این تحقیق، برای تولید بیودیزل از روغن پسماند کلزا در حضور کاتالیست K2CO3/Al2O3 استفاده شد. برای آماده­­سازی کاتالیست از روش حل­کردن K2CO3  بر Al2O3  استفاده شد. برای انجام واکنش ترانس استریفیکاسیون و بررسی اثر پارامترهای مختلف زمان واکنش، دما و درصد وزنی کاتالیست بر بازده­ تولید بیودیزل و بهینه­کردن تعداد آزمایش­­ها، از طراحی آزمایش­ تاگوچی، در طرح کاملاً تصادفی با دو تکرار، استفاده شد. همچنین، نسبت مولی متانول به روغن 15 به 1، میزان کاتالیست 5/0، 1،  5/1، 2، 3 و 5 درصد وزنی، دمای واکنش 55، 65 و 75 درجه سانتی­گراد، زمان واکنش  5/0، 1، 5/1، 2، 5/2 و 3 ساعت و دور همزن rpm 600  درنظر گرفته شد. بهترین بازده تولید بیودیزل (99 درصد)، پس از 2 ساعت با استفاده از 1 درصد وزنی کاتالیست ناهمگن پتاسیم­کربنات/آلومینا در دمای C°65 حاصل می­شود. از سوی دیگر، مقایسه نتایج حاصل با مطالعات سایر محققان نشان می­دهد بارگذاری K2CO3نسبت به  KNO3و Ca(NO3)2، می­تواند بازده تولید بیودیزل را در کاتالیست­های با پایه آلومینا افزایش دهد. تحلیل واریانس با درنظر گرفتن متغیرهای میزان کاتالیست، زمان و دمای واکنش، بیانگر آن است که تغییرات دما اثر معنادار بر بازده تولید متیل استر ندارد، لیکن اثر تغییرات زمان و میزان کاتالیست مورد استفاده بر درصد تبدیل واکنش کاملاً معنادار است.

کلیدواژه‌ها


عنوان مقاله [English]

Effects of Important Parameters on Biodiesel Production using Heterogeneous Potassium Carbonate/Alumina Catalyst and Rapeseed Oil

نویسندگان [English]

  • elmira yazdanian 1
  • Nooshin Gholipour Zanjani 2
  • arash kamran-pirzaman 3
1 University of Science and Technology of Mazandaran
2 2- Department of Chemical Engineering, Standard Research Institute, Petrochemical Research Group, Alborz, Iran,
3 mazandaran university of science and technology
چکیده [English]

Biodiesel, due to its environmental benefits and similar properties with diesel, is considered as a fossil fuel alternative. Rapeseed oil is used to produce biodiesel in presence of K2CO3/Al2O3. For catalyst preparation K2CO3 was loaded on the Al2O3 as support using impregnation. Taguchi’s experimental setup was used in a completely randomized design with two replications for transesterification reaction and investigating the effects of reaction time, temperature and catalyst concentration on biodiesel production efficiency and to optimize the number of experiments. Also, molar ratio of 15 to 1 (alcohol:oil), catalyst concentrations of 0.5, 1, 1.5, 2, 3 and 5 wt.%, reaction temperatures of 55, 65 and 75 °C, reaction times of 0.5, 1, 1.5, 2, 2.5 and 3 hr. and stirring rate of 600 rpm was used for transesterification reaction. Highest biodiesel yield (99%) was obtained by transesterification process at 65 °C using 2 wt. % of K2CO3/Al2O3 for 2 hr. Comparing these results to other researcher’s results shows that the loading ratio of K2CO3 compared to KNO3 and Ca(NO3)2 can increase the biodiesel production efficiency in alumina-based catalysts. Analysis of variance analysis with regard to catalyst, reaction time and temperature variables indicates that temperature changes have no significant effect on the efficiency of methyl ester production, but the effects of time and catalyst concentration on the reaction rate is quite significant.
 

کلیدواژه‌ها [English]

  • Biodiesel
  • Heterogeneous catalyst
  • Potassium Carbonate/Alumina
  • Transesterification
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