a) What is liquid-liquid separll8 b) Describe three distinct processes involved in liquid-liquid operations? c) Acetic acid in an aqueous solution containing 1.0% acetic acid is to be extracted with benzence at 20C using co-current contact equipment. Benzene and aqueous solution are essentially insoluble. Equilibrium data kg acetic acid Y = 0 odtiso7 0.001961 0.00456 0.00686 0.00913 0.0187 kg benzene Ag acetic ocid X-. g aqurous solution 0 0.001011| 0.00246 0.00502 0.00751 0.00998 0.0204 i) If 100 kg of feed solution is extracted once with 150 kg benzene, determine the percent extraction? ii) Determine the percent extraction of acetic acid for three theoretical extractions using 50 kg solvent each. iii) As a Chemical Engineer who is tasked to design an effective Solvent Extraction plant, which one would you recommend between a single and a three extraction stages? Give a reason? (4 marks) (6 marks) 12 marks] d) Calculate the number of stages that would be required in order to achieve the percent extraction determined in question 2c(ii), if 50 kg benzene is used and the equilibrium relation is given by; (4 marks) (kg acetic acid/ kg benzene) = 2.5 (kg acetic acid/kg aqueous solution)