Q2 Answer all parts. Use a separate answer book for this question [50 marks]. A gas permeation system is being used to separate carbon dioxide from methane in a raw biogas stream. A poly(amide+imide) membrane has been selected for this separation, operating at 35C with a thickness of 1104cm. Operating data: High pressure: 10 bara, low pressure: 1 bara The biogas to be treated is 60%CH4 on a molar basis. You may assume that the remainder is CO2 Feed molar flow rate is 1mol/s. Permeability of CO2 is 181010cm3(STP)cm/cm2.s.cmHg Permeability of CH4 is 0.351010cm3(STP)cm/cm2.s.cmHg Cut is 0.5 . The following data has been logged after a series of performance trials have been carried out. Table 1. Performance Data Biogas Treatment System (i) Calculate the missing values in the table for a cut of 0.5 . [26 marks] (ii) Once the table is complete, assess the trends that are apparent for these parameters in light of theory. Use equations to support the points you make. [20 marks] (iii) If you wished to operate the system with the same product compositions but less membrane area, what would you do? [ 4 marks ] A general list of some equations is given on the next page. These may or may not be relevant to the question, or you may need to adapt them