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Answer

In the production of soybean oil, dried and flaked soybeans are brought into contact with a solvent (often hexane) that extracts the oil and leaves behind the residual solids and a small amount of oil. Draw a flowchart of the process, labeling the two feed streams (beans and solvent) and the leaving streams (solids and extract). The soybeans contain 14.5 wt% oil and the remainder insoluble solids, and the hexane is fed at a rate corresponding to 3.00 kg hexane per kg beans. The solids stream leaving the extraction unit contains 37.5 wt% hexane, all of the non-oil solids that entered with the beans, and 1.00% of the oil that entered with the beans. For a feed rate of 750 kg/h of dried flaked soybeans, calculate the mass flow rates of the extract and residual solids, and the composition of the extract. Extract: i kg/h Solids: Na kg/h wt% oil i % wt% oil PB % wt% hexane i % wt% hexane PA % wt% non-oil solids PN %