To receive full credit on these problems you need to use the problem solving met
ID: 802352 • Letter: T
Question
To receive full credit on these problems you need to use the problem solving method presented in the text and used in class including a DOF analysis. You must also clearly label all equations that you write and identify your answers by drawing a box around them. A membrane process is used to recover H_2SO_4 from the waste steam in a plating plant. The operation used a dialysis membrane unit. The waste stream is fed to the dialysis unit on one side of the membrane and pure water is fed to the unit on the other side of the membrane. The waste stream enters at a rate of 400 kg/hr and consist of 35 wt % H_2SO_4, 3 wt % CuSO_4 and 4.5 wt % NiSO_4 dissolved in water. The pure water is fed at a rate of 400 kg/hr. The waste out stream consists of 12.5% H_2SO_4. 2.6% CuSO_4and 4.3% NiSO_4 in water. The stream on the downstream side of the membrane is called the permeate stream and consist of H_2SO_4. CuSO_4and NiSO_4 dissolved in water. The permeate stream leaves the unit at a rate of 420 kg/hr. Calculate the mass flow rate of the waste out stream. Calculate the wt % of all components in the permeate stream.Explanation / Answer
1. The waste stream flow rate=400 kg/hr
Pure water flow rate=400 kg/hr
Permeate stream rate=420 kg/hr
consists of H2SO4, CusO4, NiSO4
rate of Inflow= rate of outflow
Waste feed+water=waste out + permeate
waste out rate=??
400+400=waste out+420
380kg/hr=waste out
Mass flow rate of waste out stream=380 kg/hr
2. Waste feed stream rate=400 kg/ hr
components in waste feed stream=35%H2S04, 3%CuSO4, 4.5% NiSO4
components in waste out stream=12.5%H2SO4, 2.6%CuSO4, 4.3NiSO4
Now we need to calculate components wt% in permeate stream
Since wt% of inflow components=wt% of outflow components
Therefore wt% components in permeate stream=(35-12.5)%H2SO4,(3-2.6)%CuSO4,(4.5-4.3)%NiSO4
=22.5%H2SO4, 0.4%CuSO4, 0.2%NiSO4
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