Optimization of preparation of walnut oil by automatic horizontal hydraulic press

Keywords: walnut oil  automatic horizontal hydraulic press  response surface methodology  residual oil rate of walnut cake

Abstract： In order to reduce the production cost of walnut oil prepared by automatic horizontal hydraulic press, the effects of raw material particle size, raw material moisture and pressing temperature on the residual oil rate of walnut cake were studied by single factor experiment. Then with the residual oil rate of walnut cake as an index, the conditions of preparing walnut oil by the automatic horizontal hydraulic press were optimized using response surface methodology. The results showed that the optimal process conditions of preparing walnut oil by the automatic horizontal hydraulic press were obtained as follows: raw material particle size 120 meshes(0.125 mm), raw material moisture 1.5%, pressing temperature 60℃. Under these conditions, the residual oil rate of walnut cake was 13.43%.