Q1.How does distillation column reboiler outlet temperature along with boilup ratio and Column pressure is finalized for binary components mixtures? (Benzene and Toulene Mixture)

Most importantly, as the liquid mixture is not pure, it doesn't have fixed boiling or condensing temperature, how to evaluate heat required to vaporize 50% of the Bottom liquid and 100% of the bottom liquid once bottom composition is fixed? Kindly help me.

Coming to evaluation of sensible and latent heat in boiling liquid mixtures, till what temperature Sensible heat has to be considered, is it till the bubble point of the liquid mixture or average of the Dew point and Bubble point of the mixture?

Kindly guide me