The Application of Waste Eggshell Derived Calcium Oxide in Biodiesel Synthesis

Gotovuša, Mia; Huzjak, Paula; Zadravec, Ivana; Zadravec, Martina; Parlov Vuković, Jelena; Faraguna, Fabio (2023) The Application of Waste Eggshell Derived Calcium Oxide in Biodiesel Synthesis. In: 7th Faculty of Science PhD Student Symposium - Book of Abstracts. Zagreb, Faculty of Science, University of Zagreb, p. 109 .

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Abstract

Poultry egg consumption is quite frequent worldwide which consequently causes large amounts of eggshell waste, approximately 8.58 million tons per year. Due to high disposal costs, recycling of the waste eggshells into an enviromentally- friendly catalyst is a potential solution. Eggshell consists mostly of calcium carbonate (CaCO3), which is transformed into calcium oxide (CaO) through the calcination process and used as a heterogeneous catalyst. Such catalyst is suitable for the industrial production of biodiesel because of its easy separation from the reaction mixture and reusability, reducing the process costs. Biodiesel itself is a renewable energy source and is considered an alternative fuel to commercial diesel. It is primarily obtained via transesterification reaction, from vegetable oils or fats and an alcohol, in the presence of a catalyst. The use of a heterogeneous catalyst originating from waste eggshells, as well as waste cooking oil as feedstock, further contributes to the renewability of the entire biodiesel synthesis process and the recovery of waste materials [3]. This study compares the influence of CaO obtained by calcination at 900 °C from eggshell and commercial CaO on the conversion of waste cooking oil into fatty acid methyl esters (biodiesel). The reaction was carried out for 2 hours at 65 °C with 5 % catalyst by mass of oil. NMR analysis showed yields of 100 % for both catalysts.

Item Type:	Conference or workshop item published in conference proceedings (UNSPECIFIED)
Uncontrolled Keywords:	biodiesel; transesterification; waste eggshells; calcium oxide
Subjects:	NATURAL SCIENCES
Divisions:	NMR Center
Projects:	Project title Project leader Project code Project type Razvoj funkcionalnih biogoriva i (bio)aditiva te ispitivanje primjenskih svojstava mješavina s mineralnim gorivima-FunBioFA Fabio Faraguna; Petar Ilinčić; Lucija Konjević; Dijana Blažek UIP-2019-04-5242 HRZZ
Depositing User:	Jelena Parlov Vuković
Date Deposited:	14 Jan 2026 12:06
URI:	http://fulir.irb.hr/id/eprint/10885

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