1. 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. The soybeans contain 18.5 wt% oil and the remainder insoluble solids, and the hexane is fed at a rate corresponding to 2.0 kg hexane per kg beans. The residual solids leaving the extraction unit contain 35.0 wt% hexane, all of the non-oil solids that entered with the beans, and 1.0% of the oil that entered with the beans. 1000 kg/h of dried flaked soybeans are fed to the process unit. a. Draw a flowchart of the process, labeling the two feed streams (beans and solvent) and the leaving streams (solids and extract) with standard variables to denote amount and composition for each stream. b. Carry out a degrees of freedom analysis. Write out the system of independent mass balances in terms of the symbols on your flowchart. Write out the “other equations” that will be used to specify the process. c. Calculate the mass flow rates of the extract and residual solids, and the compos ition of the extract.
1. 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. The soybeans contain 18.5 wt% oil and the remainder insoluble solids, and the
hexane is fed at a rate corresponding to 2.0 kg hexane per kg beans. The residual solids
leaving the extraction unit contain 35.0 wt% hexane, all of the non-oil solids that entered
with the beans, and 1.0% of the oil that entered with the beans. 1000 kg/h of dried flaked
soybeans are fed to the process unit.
a. Draw a flowchart of the process, labeling the two feed streams (beans and solvent) and
the leaving streams (solids and extract) with standard variables to denote amount and
composition for each stream.
b. Carry out a degrees of freedom analysis. Write out the system of independent mass
balances in terms of the symbols on your flowchart. Write out the “other equations” that
will be used to specify the process.
c. Calculate the mass flow rates of the extract and residual solids, and the compos ition of
the extract.
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