Penicillin is separated from fermentation broth by adsorption on an ion-exchange resin in a moving-bed column. The bed is 5 cm in diameter and contains 0.7 cm3 resin/cm3 bed. The density of the resin is 1.2 g/cm3, and the feed solution contains 8 g/l of the antibiotic. If the superficial velocity of liquid is 2 m/h and the overall mass transfer coefficient is 15h-1, determine the height of the column for an efficient antibiotic concentration of CL = 0.2 g/L. Assume an equilibrium relationship of CS = 25 (CL*)1/2, where CS is g solute/L resin and CL is g solute/L solution. The operational ratio of the volumetric flow rate of broth to resin is 10.

Salicylic acid is a very important acid. it is used to synthesize the aspirin by treating with acetic anhydride. a 0.2015-g sample of salicylic acid was dissolved in a 100.00-ml volumetric flask, and the solution was diluted to the mark. a 10-ml aliquot of this solution was titrated with standard naoh (0.01130 + 0.2% n) to a phenolphthalein faint pink color end point at 19.81 ml. (a) (calculate the normality of the salicylic acid solution used in the titration. (b) assuming the salicylic acid is pure, what is the equivalent weight of the salicylic acid? practice problems for the final exam (continued) (c) (calculate the inherent error in the determination of the equivalent weight you calculated in part (b). use the following absolute errors in the equipment /glassware when calculating the inherent error. 5.00-ml pipet: + 0.02 ml 100-ml volumetric flask: + 0.08 ml analytical balance: + 0.2 mg 25-ml buret: + 0.03 ml

How far is the region from the equator or control climate

In the following redox reaction which is the oxidizing agent and which is the reducing agent? alcl3 + na nacl + al oxidizing agent = reducing agent =