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Unformatted text preview: ChE 501 Fall 2016 HW Assignment 6 Solution 1. A solution of 25.0 wt% Sodium Sulfate in water is to be added to a mixer with a
stream of pure water and diluted to 15.0 wt%. Find the required ﬂowrate of water. Stream 1 Stream 3
m1 kglh m3 kg/h
0.35 kg NaOHI kg 0.15 kg NaOH/kg Stream 2
mg kg Water/h No ﬂowrate is given. Take as a basis 100 kg/h of feed solution. Find mg for this basis. NaSO4 balance: 0.25(100) = 0.15m3
o. 15 Total Mass balance: 100 + m2 = 167 m2 =67 2. A stream of water containing a solute A at a concentration of 33. 4 wt% kg A/kg enters
an extraction unit at a rate of 135 kg/h. A stream of pure solvent S enters the unit at a rate
of 750 kg/h. In the unit, some of the A leaves the water stream and enters the ’svae'rit
stream. A stream of water with some A and a stream of solvent with some A leave the
unit. The ratio of the mass fraction of A in the solvent stream to the mass fraction of A in
the water stream is 5.75. Set up and solve the problem according to the procedure in
section 4.3e. Draw and label a ﬂow diagram. .  . “1.. ChE 501 Fall 2016 HW Assignment 6 Solution 1. A solution of 25.0 wt% Sodium Sulfate in water is to be added to a mixer with a
stream of pure water and diluted to 15.0 wt%. Find the required ﬂow—rate of water. Stream 3
m1 kg/h m3 kglh
0.35 kg NaOHI kg 0.15 kg NaOHlkg Stream 2
mg kg Water/h No ﬂowrate is given. Take as a basis 100 kg/h of feed solution. Find mg for this basis. NaSO4 balance: 025(100) = 0.15m3
0.15 Total Mass balance: 100 + m2 = 167 I712 =67 2. A stream of water containing a solute A at a concentration of 33. 4 wt% kg A/kg enters
an extraction unit at a rate of 135 kg/h. A stream of pure solvent S enters the unit at a rate
of 75.0 kg/h. In the unit, some of the A leaves the water stream and entérsﬂfhé svaerit
stream. A stream of water with some A and a stream of solvent with some A leave the
unit. The ratio of the mass fraction of A in the solvent stream to the mass fraction of A in
the water stream is 5.75. Set up and solve the problem according to the procedure in
section 4.3e. Draw and label a flow diagram. ...
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 Spring '14
 DBarkey
 Chemical Engineering

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