Macroporous glass spheres with 60% porosity and a 0.3 cm diameter are impregnated with a 2.0 wt% solution of methanol in water. 100 L of these particles are dropped into 250 L of water and kept in suspension by agitation at 20°C. The water is well mixed and external mass transfer can be neglected. Assuming that the tortuosity factor for the particles is 2, determine

(a) The amount of methanol remaining in the particles, expressed as a percentage of the initial value and the methanol concentration in the surrounding solution after 15 min, and

(b) The final concentration of methanol in the solution when . Note that the methanol–water mixtureis not adsorbed but just fills the pores.

Transcribed Image Text:

t = o