A batch of solids need to be dried from 30 to 15% moisture content (on a wet basis) whose characteristic drying curve is shown below.

A) Establish expression/ expressions for the rate of drying over the entire drying regime, using the data given below. Show the appropriate reasoning.

[10marks]

B) Evaluate an expression for the time taken for drying the sample, and calculate the time taken for drying, given the following data.[15 marks]

C)

The initial weight of the wet solid is 1000 kg, and the unit surface area is 0.02 m2/kg of dry weight of the sample.