آزمون میان ترم فرآیندهای جداسازی به صورت دیجی فرم

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تایید دوربین

Derive general expressions for (a) the partition coefficient, KoD, in an organic (1) aqueous–(2) LLE system for an un-ionized (neutral) form of a weak base given by: HB+ H+ + B (b) the distribution coefficient between organic and aqueous fluid phases in terms of pH and pKa. (20%)

تایید

Acetic acid is extracted from a 3 wt% dilute solution in water with a solvent of isopropyl ether in a mixer-settler unit. The flow rates of the feed and solvent are 12,400 and 24,000 lb/h, respectively. Assuming a residence time of 1.5 minutes in the mixer and a settling vessel capacity of 4 gal/minute-ft2, estimate: (a) diameter and height of the mixing vessel, assuming H/DT =1. (10%) (b) agitator horsepower for the mixing vessel. (5%) (c) diameter, length, and residence time in minutes of the settling vessel, assuming L/DT= 4. (5%)

تایید

A feed, F, of 100 kmol/h of air containing 20 mol% O2 and 80 mol% N2 is to be partially separated by a membrane unit according to the following specifications. Compute the amounts of split fraction, split ratio and separation factor in each of the following cases: Case 1: 40% recovery of O2 to the permeate and 90% recovery of N2 to the retentate. Case 2: 60% recovery of O2 to the permeate and 40 mol% purity of O2 in the permeate. Case 3: 90 mol% purity of N2 in the retentate and 60 mol% purity of O2 in the permeate. (30%)

تایید

A) What are the advantages and disadvantages of using extraction separations? (write at least 2 item for anyone) (10%) B) When we use an extraction method instead of a direct separation process such as distillation process? (10%) C) What are the selection criteria for solvent selection in extraction process? (10%)

تایید