(40 points) Material Balances without Reaction. Hexane, an organic solvent, is c
ID: 701847 • Letter: #
Question
(40 points) Material Balances without Reaction. Hexane, an organic solvent, is commonly used to extract oil from soybean flakes because of the high solubility of the oil in the hexane solvent. Suppose that 100 kg/hr of soybean flakes containing 21% oil and 79% solids (Stream F) is extracted with 100 kg/hr of pure hexane (Stream H), as is shown in the figure below. The product (Stream P) contains hexane and oil, but no solids. The waste stream (Stream W) contains 89% solids, 6% oil and 5% hexane. 2. What percentage of the oil that is fed to the process in Stream F is recovered in Stream P? 24-6% a. b. List two ways to improve the process to recover more of the oil in StreamPi f t Stream H, hexane solvent Pure hexane, 100kg/hr Fra) Stream F, feed 79% solids, 21% oil 100 kg/hr Stream W waste 89% solids, 6% oil, 5% hexane Extractor . What percentage of the oil fed in F is recovered in P? List two ways to improve the process to recover more oil. a. b. Stream P, product Hexane + oil, no solidsExplanation / Answer
Overall mass balance:
F + H = P + W
Given F = 100 kg/hr ; H = 100 kg/hr
P + W = 200
Component mass balance: solids
F * (0.79) = W * (0.89)
W = (0.79/0.89)*100 = 88.764 kg/hr
Percentage of oil extracted =[ F * (0.21) – W*(0.06) ] / [ F* (0.21) ] *100
= [(21 - 5.32)/ 21]* 100
= 74.638 %
TWO ways to improve this extraction process:
To maximize the mass transfer rate, make sure that seeds be porous so that solvent can easily collect the oil from seeds
Based on economical constraints usage of solvent is fixed, and also make sure that sufficient time is given for mass transfer to take place effectively(until the equilibrium conditions)
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