Extraction of oil from Terminalia chebula kernel by using ultrasound technology: Influence of process parameters on extraction kinetics

•Ultrasound technology was used for extraction of T. chebula kernel oil.•A second order model was used to study the extraction kinetics of oil.•Kinetic parameters were evaluated for each process variable at optimized condition.•Microstructure of kernel powder before and after oil extraction was studied by SEM.•Physicochemical analysis and particle size determination of extracted oil.