Tertiary butylhydroquinone influence over oxidation stability of biodiesel from waste cooking oil

ABSTRACTAn oxidation stability is very important for a long-term storage of biodiesel. Some physical (density and viscosity) chemical properties (acid value, iodine peroxide value) were analyzed to predict the biodiesel produced from Waste Cooking Oil (WCO). WCO one potential feedstocks in Indonesia, which large cooking oil consumer. Biodiesel was by transesterification process 60 oC temperature hour reaction time. Methanol added 4:1 (v/v) ratio with 2% potassium hydroxide as catalyst. This study observed influence tertiary butylhydroquinone (TBHQ), synthetic antioxidant, on TBHQ used an antioxidant agent prevent such storage. It blended at various concentrations (0-1200 ppm). Samples taken every week measure density, viscosity, acid value (IV) (PV) during blends conducted 4 weeks. The experimental results revealed that improvement achieved all concentrations. All parameters meet Indonesia’s National Standards (SNI) up 1200 ppm. treated ppm provided best result, due its IV, PV. However, addition did not affect free fatty number weeks storage.Keywords: antioxidant; biodiesel; stability; waste oilABSTRAKKetahanan oksidasi merupakan karakteristik yang sangat penting dalam penyimpanan Penelitian ini menganalisis sifat-sifat fisis (densitas dan viskositas) serta kimia (angka asam, angka iod peroksida) minyak jelantah untuk memperkirakan ketahanannya terhadap pengaruh oksidasi. Minyak salah satu bahan baku potensial di karena kapasitas penggunaannya cukup besar. dihasilkan dengan transesterifikasi pada suhu selama 1 jam. Metanol ditambahkan reaksi menggunakan perbandingan volume 4:1, katalis KOH sebanyak berat minyak. mempelajari (TBHQ) ketahanan jelantah. digunakan sebagai antioksidan jangka panjang. dicampurkan ke variasi konsentrasi 0-1200 Ketahanan dipelajari masa simpan minggu. Sampel dianalisis densitas, viskositas, peroksida setiap Hasil analisis menunjukkan bahwa telah memenuhi SNI semua TBHQ. terbaik diberikan oleh TBHQ, menilik dari nilai bilangan iod. Penambahan tidak berpengaruh secara signifikan asam lemak bebas minggu.Kata kunci: biodiesel, oksidasi, antioksidan,