Abstract
In order to improve the pour point and smoke emission of coconut oil biodiesel, coconut oil isobutyl ester, trans-esterified from isobutanol and coconut oil, was mixed with isobutanol, and the fuel properties, combustion characteristics and exhaust emissions of the blend fuel were investigated using a single cylinder DI diesel engine. Coconut oil isobutyl ester with 30 mass% isobutanol (CIBE-IB30) has lower pour point (-20 °C) compared to coconut oil 1-butyl ester with 30 mass% 1-butanol (CBE-B30). The ignition delay of CIBE-IB30 is slightly longer than that of CBE-B30. Therefore, especially at low load conditions HC and CO emissions of CIBE-IB30 are higher than that of CBE-B30. However, CIBE-IB30 has almost the same thermal efficiency and NOx and Smoke emissions compared to CBE-B30 at all load conditions. From the experimental results of pour point, thermal efficiency and exhaust emissions, it is concluded that CIBE-IB30 is better alternative diesel fuel than CBE-B30.
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