it is desired to process a batch of 30000 L of n-butyl alcohol in a standard agitated tank using a turbine with four inclined blades and a stirring level 6. The tank has a helical coil that is supported by the deflectors and has a total of 14 turns. The tube of a coil has 1 1/2 in, OD 14 BWG. Water vapor circulates through the tube with a velocity of 2.44 m/s.

a) Determine the relevant dimensions of the agitation system assuming that the height of the tank wall is 15% greater than that of the liquid obtained.

b) determine the time required to heat the alcohol from 20 to 70 C using a water vapor at 450 kPa(g) circulating through the tube at a speed of 2.44 m/s

c) determine the time required to cool the alcohol from 70 to 30 C using water at 25 C circulating through the tube at a rate of 2.44 m/s