A mixture of benzene and toluene are to be separated in a flash tank. At what temperature should the tank be operated to get the highest purity

A mixture of benzene and toluene are to be separated in a flash tank. At what temperature should the tank be operated to get the highest purity toluene in the liquid phase (maximizing xT)? The pressure in the flash tank is 800 mm Hg. The units for Antoine’s equation are mm Hg and °C for pressure and temperature, respectively.

xB Psat B + xTPsat T = P

log10 (Psat B) = 6.905 – 1211/T + 221

log10 (Psat T) = 6.953 – 1344/T + 219