QUESTION 2: [31] Carbon disulphide, CS2, is to be recovered from a gas containing 15 mole% CS2 and 85 mole% air. The gas is fed to a continuous absorption tower, as shown in figure 1, where it contacts with liquid benzene, which absorbs CS₂, but not air. Benzene is fed to the column in a 2:1 mole ratio to the feed gas (i.e. for every 1 of n₁ fed, 2 kmol h kmol h of n₂ must be fed). Some of the benzene evaporates and leaves with other gases at the top of the absorption tower as vapor. The gas leaving the absorber contains 2 mole% CS2 and 2 mole % benzene. As basis for calculation, use n₁ = 100 kmol/h 2.1 n3 = Gas out n₂ = Pure Solvent Ycs₂ Yair = 0.02 YB -0.02 YB = 1.0 GAS ABSORPTION TOWER n₁ = Gas in Ycs₂ = 0.15 n4 = Solvent out Ycs₂ YAir = 0.85 Ув Figure 1: Gas Absorption Tower Generate independent and dependent equations and provide the total balance equation for the gas absorption tower system. [8] 2.2 Complete a degrees-of-freedom (DOF) of the process. [4] 2.3 Determine the mole fraction of air (YAir 3) in stream 3 (3) unknowns specified in 1.1. [1] 2.4 Determine the molar flowrate of the exiting gas stream (3) [2] 2.5 what is the molar flowrate of the benzene stream (2) based on mole ratio of 2:1 to gas fed? [3] m 2.6 Calculate the molar flowrate of the benzene (4 YB,4) in stream 4 or in n4. [3] 2.7 Calculate the molar flowrate of the carbon disulphade (4 ycs,4) in stream 4 or in n. [3]​