Doyonuphak is the smallest size ≤ 0.250 mm, the maximum rate of return, which is derived from experiment 1, 2 and 3 of the extracted oil is 21.42%, 21.44% and 21.53%, respectively.
The smallest particles < = 0.250 mm to maximize yield obtained from the trials, and 1 2 3 extraction of oil. , and is 21.42% 21.44% 21.53% respectively.