SEPERATION TECHNIQUES (CHEMICAL ENGINEERING) 1. A q-state mixture containing ethane, propene, propane, isobutane, butene and butane, the composition of which is given below (xF), is fed to a distillation column operating at a pressure of 100 psia at a speed of Fkmol/st. In distillation, a subproduct containing molce\% A of the isobutane in the feed will be produced. The sub-product should not contain more than molce\%B of the entering propane. There will be no butene and butane in the upper product, and ethane and propene in the lower product. The distillate dew point is: 36F; The boiling point of the lower product is: 127F. The K values at these temperatures for the components are given in the chart. a) Find the quantities and compositions of the upper and lower products. b) Calculate the minimum number of steps. c) Find the minimum backflow rate (it is advisable to start trial-and-error with =2 ). d) What is the theoretical number of shelves required when working on the C floor of the minimum RD value? e) Find the number of shelves in the enrichment and stripping zones. SEPERATION TECHNIQUES (CHEMICAL ENGINEERING) 1. A q-state mixture containing ethane, propene, propane, isobutane, butene and butane, the composition of which is given below (xF), is fed to a distillation column operating at a pressure of 100 psia at a speed of Fkmol/st. In distillation, a subproduct containing molce\% A of the isobutane in the feed will be produced. The sub-product should not contain more than molce\%B of the entering propane. There will be no butene and butane in the upper product, and ethane and propene in the lower product. The distillate dew point is: 36F; The boiling point of the lower product is: 127F. The K values at these temperatures for the components are given in the chart. a) Find the quantities and compositions of the upper and lower products. b) Calculate the minimum number of steps. c) Find the minimum backflow rate (it is advisable to start trial-and-error with =2 ). d) What is the theoretical number of shelves required when working on the C floor of the minimum RD value? e) Find the number of shelves in the enrichment and stripping zones