A feed of 10,000 kg of soybeans is processed in a sequence of three stages. The feed contains 35.0 wt% protein, 27.1 wt% carbohydrate, 9.40 wt% fiber, 10.5 wt% moisture, and 18.0 wt% oil. In the first stage the beans are crushed and pressed to remove oil,giving an expressed oil stream and a stream of pressed beans containing 6.00 wt% oil.Assume no loss of other constituents with the oil stream. In the second step the pressed beans are extracted with hexane to produce an extracted meal stream containing 0.500 wt% oil and a hexane-oil stream. Assume no hexane in the extracted meal. Finally, in the last step the extracted meal is dried to give a dried meal of 8.00 wt% moisture. a. Draw and label the flow chart for this process. Use variable notation to label the amount and composition of each flow stream. b. Carry out a DOF analysis on each subsystem based on your flowchart. c. Calculate the kg of pressed beans from the first stage.
A feed of 10,000 kg of soybeans is processed in a sequence of three stages. The feed contains 35.0 wt% protein, 27.1 wt% carbohydrate, 9.40 wt% fiber, 10.5 wt% moisture, and 18.0 wt% oil. In the first stage the beans are crushed and pressed to remove oil,giving an expressed oil stream and a stream of pressed beans containing 6.00 wt% oil.Assume no loss of other constituents with the oil stream. In the second step the pressed beans are extracted with hexane to produce an extracted meal stream containing 0.500 wt% oil and a hexane-oil stream. Assume no hexane in the extracted meal. Finally, in the last step the extracted meal is dried to give a dried meal of 8.00 wt% moisture.
a. Draw and label the flow chart for this process. Use variable notation to label the amount and composition of each flow stream. b. Carry out a DOF analysis on each subsystem based on your flowchart. c. Calculate the kg of pressed beans from the first stage. d. Calculate the kg of extracted meal from the second stage.
e. Calculate the kg of dried meal from the third stage and the wt% protein.
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