Kiagus Ahmad Roni, Herawati, N., Dewi, D.K. and Martini, S. 2021. The Utilization of Kepyar Castor Oil (Ricinus Communis) and Alumina Silica Catalyst in Alcoholysis Process. Journal of Engineering and Scientific Research. 3, 1 (Jun. 2021), 32 –. DOI:https://doi.org/10.23960/jesr.v3i1.76.