I need help how do I approach this? mas-ransfor coeficient ix owng 0016 W, ams W

Question

I need help how do I approach this?

mas-ransfor coeficient ix owng 0016 W, ams Which aids the How transfer, much time will b and the mass-transfer coefficient is 0.016 cm/s. How much time will be required to deliver 50 mg of the drug? 5. The intermediate product of a chemical process is a chem- paste that is saturated with water. The paste is rolled into 6. char a thin layer and placed to dry in a flat area 30 m long by 15 m com wide. Drying is enhanced by blowing hot air over the paste, and ones through the paste is rapid so that the concentration of water va- Assu 9.5 Imin (liquid volume). (Note: MWwater 18 and Pwater-ee the mass-transfer coefficient is 0.017 m/s. Diffusion of water whic whi por at the surface of the paste remains constant at 0.002 gmolU/L. Water must be removed from the paste at a minimum rate of an perc rate such g/cm3)

Explanation / Answer

30 m x 15 m x 0.017 m/s = 7.65 m3 /s = 7650 L/s    are deplaced from the paste surface

At the paste surface the concentrtion of vapour is 0.002 mol/L, then

7650 L/s   x 0.002 mol/L = 15.3 mol water /s are removed or

15.3 mol x 18 g/mol = 275.4 g /s are removed or

275.4 g /s   x 1 g/mL = 275.4 mL/s are removed or

275.4 mL/s = 0.2754 L/s are removed or

0.2754 L/s x 60 s/min = 16.5 L/min are removed.

The minimum condition is fulfilled:    16.5 L/min > 9.5 L/min

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