Oil was extracted from small particles of rapeseed, averaging 0.58 mm in size, by contact with hexane. The particles originally contained 43.82 percent oil and 6.43 percent moisture. After drying, the oil content of the dried meal was reported for different extraction times. The results are given in the table below. Determine the effective diffusion coefficient for oil in the hexane-soaked particles using the equation for transient diffusion in spheres. Assume that a large excess of hexane was used and that the external mass transfer resistance was negligible.

Transcribed Image Text:

Time, min Oil in dry meal, kg/100 kg inert material 75 11.5 90 7.97 105 4.35 120 3.88