7. A protein solution (4.4g/L), is being ultra-filtered (diffusivity, 9.51011m2/s), using a spiral wound module (Cp=0, at permeate flux 1.3105m/sCm=10g/L). Determine the 29 thickness of the boundary layer (cm). 21. A clarified fermented broth (9.6L) containing cephalosporin A(10g/L)&B(20g/L) was aimed to recover using 0.51L of amyl acetate (KA,31&KB are 11) by using a continuous counter-current extraction. Estimate the no of stages required to achieve 9X% ( X is your registered number, Ex: 90,91,92 and so on) recovery of cephalosporin A and calct late the purity