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(a) Select any type of chemical process simulator and briefly discuss ONE (1) method to achieve the desired purity of a distillation column overhead product by manipulation of the block variables. [ marks] (b) Consider a CSTR reactor in Figure Q3.1 below. where the unit for F,, and CA is m3/s,kg/m3 and mole/m3, respectively. In the reactor, the first order irreversible reaction takes place as the following: AkB If the system is isothermal and perfectly mixed, use the conservation of mass principle to develop a model for the variation of the concentration of species A with the reaction time and the reactor volume. State other assumptions involved throughout the modelling process. [25 marks]