Question (2 to 12 ) MCQ

2 A mixture of Benzene (C&H) in Toluene (C7Hg) is fed to a continuous distillation column.

It is desired that the column produce a distillate with a composition of 0.94 mol fraction Benzene, and a bottom product with a composition of 0.04 mole fraction Benzene.

If the feed stream enters the column at a rate of 151.04 kmol s1 and has a composition of 0.59 mol fraction Benzene, determine the molar flow of the distillate in kmol s¹ to

2.d.p.

3 The Bubble Point is defined as the as the temperature is raised.

4 For the diagram below, match the correct terms to the indicated lines, or points on the diagram.

Please note: All selections must be correct be awarded marks.

5 You have a mixture of two components A and B. A sample of the mixture is taken and analysed and found to have a contain of 0.25 mass fraction A.

If the relative molecular mass (RMM) for A and B are as follows:

RMM A = 69 g mol-1

RMM B = 99 g mol-1

Then determine the mole fraction of component A in the mixture to 2.d.p.

6 From the selection of statements below, select all statements which are true,

7 You have a mixture of two components A and B. A sample of the mixture is taken and analysed and found to have a contain of 0.07 mole fraction A.

If the relative molecular mass (RMM) for A and B are as follows:

RMM A-34 g mol-¹

RMM B = 115 g mol-1

Then determine the mass fraction of component B in the mixture to 2.d.p.

8 A 200 Litre barrel containing an unknown mixture of ethanol and water has been located. A sample from this barrel is taken and the temperature of the sample is adjusted to

20 C. The composition of this 20 C mixture is measured using an hydrometer and found to be 45.39% by volume ethanol in water.

Using the physical property data provided, determine the composition of ethanol in the mixture in terms of mole fraction to 2.d.p.

9 You have six sketches labelled A to F. Each sketch uses a black line to present the change in partial pressure with respect to liquid composition at a fixed system temperature. A

red line is then used to try to indicate the region where Henry's Law applies to the data.

the data

10 For the listed separation processes, match each process with their respective "separation agent":

Please note: All selections must be correct to be awarded marks for this question.

11 A mixture of two components A and B are fed continuously to a distillation column, to produce a top distillate product, and a bottom product.

The mass flow of the feed to the column is 132.64 kg s and has a composition of 0.50 mole fraction of component A.

It is desired that the column produces a top product with a composition of 0.97 mole fraction of component A, and a bottom production with a composition of 0.03 mole fraction

of component A

Determine the molar flow of the top distillate product in kmol s¹ to 2.d.p.

12 A mixture of two components A and B are fed continuously to a distillation column at a temperature 335 K.

The mass flow of the feed to the column is 530 kg s¹ and has a composition of 0.48 mole fraction of component A

If the feed mixture boils at 405 K; determine the value of a for the feed mixture, based following thermodynamic datą. You should indicate your answer to two decimal places.