Vegetable oil as a diesel fuel: status and research priorities
A review of the current status of vegetable oils as a possible substitute for diesel fuel is presented. Topics considered include identification of high oil bearing crops, oil processing and storage, results of short and long term engine tests, use of transesterification of vegetable oils and microemulsions, emissions, economics, and priorities for additional research. Results indicate that highly saturated oils could be used in a blend with diesel in emergencies, however, engine life would be reduced and maintenance costs would be increased. Vegetable oil esters are possibly a direct substitute for diesel fuel; low temperature operation and corrosiveness are problems. Vegetable oil esters are more expensive than petroleum based fuels at the present time. Future research priorities are discussed.