An industrial rotary dryer is used to dry a 100 kg of granular solid under constant drying conditions. A total of 333 minutes is needed for reducing the moisture content from 40% to 8% moisture in dry basis. Assuming that the rate of moisture content is proportional to the free moisture content. The critical moisture content was found to be 15% and the equilibrium moisture contents was 4%. (1) Illustrate the Rate of drying curve of the given conditions (ii) Calculate the time required to dry the solid to 5% under the same drying conditions.

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