Ullah, Zahoor; Bustam, Mohamad Azmi; Man, Zakaria - In: Renewable Energy 77 (2015) C, pp. 521-526
The production of biodiesel from waste palm cooking oil using acidic ionic liquid as a catalyst was investigated …. Generally, alkaline based catalysts are used to catalyze the transesterification reaction, but for waste cooking oil where it … the waste cooking oil acid value lower than 1.0 mg KOH/g. The second step of transesterification catalyzed by KOH at 60 °C …