A total of 86,000 gal/day of an aqueous solution of 3,000 ppm of NaCl is to be desalinized to 400 ppm by electrodialysis, with a 40% conversion. The process will be conducted in four stages, with three stacks of 150 cell pairs in each stage. The fractional desalinizationwill be the same in each stage and the expected current efficiency is 90%. The applied voltage for the first stage is 220 V. Each cell pair has an area of 1,160 cm2. Calculate the current density in mA/cm2,the current in A, and the power in kW for the first stage.

The feed stream to a distillation column contains 30 % propane, 50 % butane and 20 % pentane. The overhead tops product concentrate contains 80 % propane and 15 % butane, and the bottoms product contains 2 % propane. Determine the following: a) The yield (%) of overhead product per unit of feed. b) The concentration of butane and pentane in the bottoms product stream. c) The recovery (%) of propane from the feed into the overhead product (i.e. what fraction of propane in the feed stream exits in the overhead product). d) The recovery (%) of pentane from the feed into the bottoms product.

Q2\ A- A triple effect backward feed evaporator are used to concentrate NaOH solution of 10. percent and 1.25 Kg/s of feed which is initially at 297 K, using steam at 393 K and a vacuum such that the boiling point in the last effect is 325 K. If the total water vaporized from the three effects was only one kilogram per second, what are the steam consumption, the heat transfer areas, and the concentration for each effect. Assume the heat capacity of liquid 4.187 KJ/ Kg.K and the overall heat transfer coefficients are 2.5, 2, and 1.6 KW/m². K. respectively. Cp= 4.81kg/kg.k

kindly answer this problem. draw the diagram. do not type answers