1. A mixture of benzene (A), toluene (B) and xylene (C) is separated by a set-up of 3 distillation

columns and a mixer as shown in Figure 1 below. At steady state, the data in Table 1 are taken.

Calculate the values for all the unknowns Table 1 and fill in the values in the table. Give all

your answers to an accuracy of 2 decimal places. Show your working clearly in your answer

sheet.

Material

Streams

kg/h

M1 (Feed)

Components

A

B

C

M1

100.0

45.0

30.0

25.0

Column 1

M2

11.83

M2

M3

M3

Figure 1

Column 2

Table 1

M4

M5

2.73

0

M4

M6

Composition in wt%

2.5

M5

25.0

Column 3

M6

10.15

M7

M8

M7

32.0

6.25

M8

4.17

(50 marks)

192

Z