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L-Serine is an amino acid that is often provided when intravenous feeding solutions are used to maintain the health of a patient. It has a
L-Serine is an amino acid that is often provided when intravenous feeding solutions are used to maintain the health of a patient. It has a molecular weight of 105, is produced by fermentation, and recovered and purified by crystallization at 9C. Yield is enhanced by adding ethanol to the system, thereby reducing serine solubility in aqueous solutions. An aqueous serine solution (the feed) containing 25 mass% serine and 75 mass % water is added along with ethanol to a crystallizer that is allowed to equilibrate at 9C. The resulting crystals are recovered by filtration; liquid passing through the filter is known as filtrate, and the recovered crystals (the product) may be assumed in this problem to be free of adhering filtrate. The product crystals contain a mole of water for every mole of serine and are known as a monohydrate. The filtrate is determined to be 3.2 mass% serine, 48.4 mass% water, and 48.4 mass% ethanol. The mass flowrate of the product crystals from a laboratory run is A00 g/min, where A is the last digit of your ASU ID. For example, if your ASU ID is 1212012345, then A = 5 and A00 g/min = 500 g/min. If the last digit of your ASU ID is 0, use A00 g/min = 1,000 g/min. Draw and label a flowchart for the laboratory run of the process. (Hint: You may consider the crystallizer and filter as one process unit. There are two inputs and two outputs.) a
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