showed that the extraction rate of cottonseed oil increased with decreasing
particle size of cottonseed flours. However, with further decrease in the particle size, the extraction of cottonseed oil was nearly constant. The optimum particle size for cottonseed was between 0.3 to 0.335 mm (Qian et al., 2008). A similar result was stated by Lim et al. (2010). They studied the effect of different particle size of Jatropha seeds on the oil yield. The results showed that the smaller particle size resulted more oil than larger particle size. According to Han et al. (2009), the main reason for increasing oil yield by decreasing the particle size is because of the increase in the specific surface area of oilseed interacting with the solvent.