QUESTION 1 Thabo works for a separation company, where he is required to separate a mixture containing 65,25 , and 10%mol of benzene, toluene, and xylene, respectively. A plate column is used to separate the mixture into a top product containing at least 90mol% benzene and negligible xylene and a bottom product containing no more than 80mol% toluene. 1.1. Give the material balances over the column giving compositions of bottoms and distillate streams. 1.2. Determine the Light and Heavy Key components for the system. [14 marks] QUESTION 2 A South African Company supplied a multicomponent hydrocarbon mixture to a separation laboratory. A multicomponent hydrocarbon mixture feed mixture was supplied as liquid at boiling point., The mixture is to be fractionated to give product distribution shown in Table 1. Table 1: A mixture of the composition with relative volatile, distillation, and bottom mole fraction 2.1. Determine the Light and Heavy Key components for the system. (2) 2.2. Using Underwood's method determine the range of the required value of (=1.3,1.4,1.5). 2.3. Determine the minimum reflux ratio. 2.4. Find the minimum number of stages. [23 marks] 1 SPP3701 Assessment 012023 S1 QUESTION 3 Table 2 contains information for an extraction process. 3.1. Determine the selectivity (separation factor). (3) 3.2. Determine the distribution coefficient (K). (3) Table 2: Information for extraction system