Drying process Q: Calculate the total drying time needed to obtain a final solvent content of 9% larger than the equilibrium moisture content in 1kg of NaCl crystals with dominant crystal size of 0.003m. Research by a company on a batch of NaCl crystalline particles have exhibited that their initial solvent content is of 3.8% in mass. - The equilibrium solvent content for NaCl crystals =0.3% in mass, - The critical solvent content (associated with a change in the drying rate dependence on the solvent content) =1.9% in mass. - The drying rate constant for NaCl=3h1m2 (taken as an estimation) - The area of the material is a function of particle size. - Shape of all particles: Cubic - The size of particles =0.003m (dominant crystal size) The drying process has a two-step profile, beginning with a constant drying rate phase and ending with a linear decay of the drying rate with the solvent content