Production of Bio-Diesel Fuel by Transesterification of Used Frying Oil

폐식용유의 에스테르화 반응에 의한 바이오디젤유 제조

Transesterification of used frying oil was investigated to produce the bio-diesel oil. Experimental conditions included molar ratio of used frying oil to alcohol (1:3, 1:5 and 1:7), concentration of catalyst (0.5, 1.0 and 1.5 wt.%), ippe of catalyst(sodium melhoxide, NaOH and KOH), reaction temperature (30, 45 and $60^{\circ}C$), and types of alcohol(methanol, ethanol and butanol). The conversion of used frying oil increased with the alcohol mixing ratio and with the reaction temperature. The effect of the type of catalysts on conversion was not significant. The highest conversion was obtained when methanol was used as alcohol. Viscosity was a little higher with the ester product over grade #2 diesel oil. But the physical properties improved significantly with transesterification, resulting in similar fuel properties with those obtained for grade #2 diesel fuel.

폐식용유와 알코올의 에스테르화 반응에 의한 바이오 디젤유 제조 실험을 하였다. 실험 조건은 폐식용유 대 얄코올의 흔합 몰비0:3, 1:5, 1:7), 촉매 의 양(0.5, 1.0, 1.5wt.% , 촉매종류(sodium meth-oxide, NaOH, KOH), 반응온도(30, 45, $50^{\circ}C$), 알코올 종류(메탄올, 에탄올, 부탄올) 등이다. 폐식용유 대 알코올 혼합 몰비가 증가하면 할수록 전환율 은 증가하였고, sodium methoxide, NaOH, KOH 촉매 종류의 영향은 크지 않았다. 반응 온도(30, 45, $50^{\circ}C$), 의 영향에서 반응 온도가 증가할수록 전환율은 증가하였고, 메탄융,에탄융,부탄올 중 메탄올 사용시 전환율이 가장 높았다. 에스테르반응 후 경 유와 물성을 비교하여 보면 점도가 다소 높게 나타 났으나,전체적무로 폐식용유의 물성이 개선되어 연료로서의 사용성이 개선되었다.