In the separation process illustrated below, fresh feed stream F consists of 20% A and 80% B on a mass basis. F mixes with recycle stream R to produce mixed stream M, which enters the separator. The mass ratio of A:B in stream M is 2:3. Product stream P, which leaves the separator at 100 kg/h, is pure A, while waste stream W is 5 mass % A. Recycle stream R is 80 mass % A. (a) Find all unknown stream flow rates. (b) Calculate the recycle ratio.

6. During Basic Oxygen Process to manufacture low carbon stainless steel, 600 kg of cast iron (6% of carbon), 500 kg of cast iron (5% of carbon) and 400 kg of cast iron (4% of carbon) will be mixed with household scrap of steel (2% of carbon) to generate 1800 kg of final product of steel with 0.5% of carbon. a. Write down material balance for iron in feed and final product. Then calculate x. b. Write down material balance for carbon in feed and final product. Then calculate total carbon removed (kg) with the slag. Basic-onygen-fornace steelmaking (Lina and Donawita prnceu) Feed: • 600 kg cast iron (6% carbon) • 500 kg cast iron (5% carbon) • 400 kg cast iron (4% carbon) • 100 X kg household scrap (2% carbon) Molten iron (70-75%6) + steel scraps (25-30)+ limeidolomite Refractory lining. Osygen lance Tap hole Pure O carbon Slag Steel BOF slag BOF converter Product: 1800 kg stainless steel (0.5% carbon)

L-serine is produced by fermentation and recovered and purified by crystallization at 10oC. To increase the yield of the crystallization step, methanol is added to the system.  An aqueous solution containing 27wt% L-serine is added with methanol to a batch crystallizer and cooled to 10oC. The crystals are then recovered by filtration. Draw a flowchart for this process showing the key unit operations with appropriate stream labels and composition.

Calculate the % yield for each crude solid based on the total amount of starting mixture. Starting mass = .804g Mass of crude p-dimethoxybenzene = .401g Mass of benzoic acid = .396g