LLE-7. In order to reduce the content of diphenylhexane from 50% by weight in the mixture to less than 10% by weight in the raffinate product, a mixture of diphenylhexane-docosane is extracted in countercurrent with furfurol at 45C. Calculate the number of theoretical stages required to achieve the concentration of diphenylhexane indicated if 800kg furfurol 500kg feed are used. The table below shows the concentrations which define the points of the binodal curve for the mixture at 45C The below table shows the equilibrium compositions which determine tie lines