Subject: Organic Chemistry 1 Lab Book: John Lehma, expermient 6, question 3 Usin
ID: 809585 • Letter: S
Question
Subject: Organic Chemistry 1 Lab
Book: John Lehma, expermient 6, question 3
Using the date in table 6.3, construct a temperature-composition diagram like that shown in figure E15 of OP-32. (a) From your diagram, estimate the initial composition of the distillate obtained by simple distillation of a mixture containing 20 mole percent cyclohexane and 80 mole percent toluene. (b) estimate the initial composition if the same mixture is distilled through a three-plate column.
Please explain and show the complete answer. Show the graph used to get the answer. Thank you
Table 6.3 Temperature-composition data for cyclohexane-toluene
Mol % cyclohexane
T, C
Liquid
Vapor
110.7
0
0
108.3
4.1
10.2
105.5
9.1
21.2
103.9
11.8
26.4
101.8
16.4
34.8
99.5
21.7
42.2
97.4
27.3
49.2
95.5
32.3
54.7
93.8
37.9
59.9
91.9
45.2
66.2
89.8
53.3
72.4
88.0
59.9
77.4
86.6
67.2
81.1
84.8
76.3
86.4
83.8
81.4
89.5
82.7
87.4
92.6
81.1
96.4
97.3
80.7
100.0
100.0
T, C
Liquid
Vapor
110.7
0
0
108.3
4.1
10.2
105.5
9.1
21.2
103.9
11.8
26.4
101.8
16.4
34.8
99.5
21.7
42.2
97.4
27.3
49.2
95.5
32.3
54.7
93.8
37.9
59.9
91.9
45.2
66.2
89.8
53.3
72.4
88.0
59.9
77.4
86.6
67.2
81.1
84.8
76.3
86.4
83.8
81.4
89.5
82.7
87.4
92.6
81.1
96.4
97.3
80.7
100.0
100.0
Explanation / Answer
Answer:
What if we now took the 80% cyclohexane/20%toluene mixture that we just obtained and placed it into a clean distillation set-up and distilled that.
Upon analysis we would find that the distillate is now 95% cyclohexane and 5% toluene. Again this is a substantial enrichment but perhaps not yet of the desired purity. Take that distillate and distill it again. This third distillation would produce distillate that is about 99% pure cyclohexane. This would normally be considered to be fairly