The diagram below shows a circuit consisting of 3 distillation columns. There ar
ID: 717763 • Letter: T
Question
The diagram below shows a circuit consisting of 3 distillation columns. There are seven streams whose total mass flowrates are given as A, B, C,. G. There are four (4) components in each stream, labelled 1 to 4. xi/ represents the mass fraction of component i in stream Assume the system is operating at steady state with no reactions. X2.B 3. x4,B I.A 2,A 3.A 4.A 2,E 3,E x4.E 3 In a workbook of a former employee, you find a mass balance equation written down about this circuit. However, one of the terms, shown as"__" has been obscured. Choose which of the following is the correct missing"__"term. X2,B x2EE X3cC x2DD None of or more than one of the above.Explanation / Answer
x2,A A = mass fraction of component 2 in A x mass of A = mass of component 2 in A
In the given equation,
x2,A A = 0
Therefore, component 2 is not present in the feed A.
As there are no reactions occurring in the distillation columns, component 2 is not produced.
Therefore, there is no component 2 in A nor B, C, and D.
Therefore,
x2,F F = 0
x2,C C = 0
x2,D D = 0
x2,G G = 0
.: In the given equation,
x2,D D is the missing term.
x2,A A = x2,C C + x2,D D + x2,F F + x2,G G = 0
We don't know about the presence or absense of any other component, so we are assuming that they are present.