This questions are under downstream processing

PROBLEMS 1. A clarified fermentation beer H containing 260 mg/L, of this antibiotic is to be extracted using butyl acetate L. Because the beer's pH is 3.5, the equilibrium constant k is 57. You plan to let H equal 450 L/h and L equals 37 L/h. You hope to recover 99% of the antibiotic in the feed. How many stages will you need to accomplish this separation? 2 Water containing 6.8 mg/L of a steroid is extracted with initially pure methylene dichloride. The k for steroid is 170 and the ratio of water to solvent is 82. What is the concentration in the organic after the extraction? What fraction of the steroid has been extracted? 3. For a non essential amino acid, the equilibrium relation between toluene and pure water is x2=(0.001 mol/litrely. We plan to contact 4.7 litre of toluene containing 0.006 M amino acid with 1 litre of water. What fraction of the amino acid can we extract