Utilization of waste plum stones as a source of oil and catalyst for biodiesel production

Possibilities of using waste plum stones in biodiesel production were investigated. The kernels used as a source to obtain oil by the Soxhlet extraction method, while whole stones, stone shells that remained after crashing, and kernel cake extraction, burned off ashes. collected ashes characterized elemental composition, porosity, base strength tested for catalytic activity transesterification esterified oil. Dominant elements potassium, calcium, magnesium at different contents three obtained most active catalyst was shell ash, so effect temperature (40, 50, 60?C) on reaction rate constant increased with activation energy value 58.8 kJ mol-1. In addition, ash can be reused recalcination.