1. List down two differences between solid-liquid extraction and liquidliquid extraction.

2. In a processing plant, you wish to leach the oil from 1500 kg/hr peanut containing 30 wt% oil using 1000 kg/hr of solvent existingly containing 20 kg/hr of the same oil in a counter-current multistage process. The leached solid is to contain 0.05 kg oil/kg iner solid. The value of N for the slurry is essentially in a linear relationship with yA, complying with N = -0.2yA + 2. Identify the flowrate and composition of the underflow and overflow leaving an ideal extractor and the number of theoretical stages needed.