Elementary Principles of Chemical Engineering, 4th edition, Chapter 4, question 11

in the production of soybean oil, dried and flaked soybeans are brought into contect with a solvent (usually hexane) that extracts the oil and leaves behind the residual solids and a small amount of oil.

A) draw a flowchart of the process, labeling the 2 feed streams (beans and solvent) and the leaving stremas (solids and extracts)

B) the soybeans contain 18.5 wt% of oil and the remainder is insoluble solids, and the hexane is fed at a rate corresponding to 2.0 kilograms of hexane per kilogram of soybeans. the residual solids leaving the extractions unit contains 35 wt% hexane, all of the non-oil solids that entered with the beans, and 1% of the oil that enterned with the beans. for a feed rate of 1000 kg/hr of dried flaked soybeans, calculate the mass flowrates of the extract and residual solids, and the composition of the extract

C) the product soybean oil must now be separated from the extract. sketch a flowchart with 2 units, the extraction units from parts A and B, and the unit separating soybean oil from the hexane. propose a use for the recovered hexane