Table 15.3 Maximum-boiling-point azeotropes Azeotrope Composition (Weight Percentage) Boiling Point (°C) 20.0% CH,COCH,, 80.0% CHCI, 17.0% CHCI, 83.0% CH,COCH,CH, 20.2% HCI, 79.8% H,О 77.0% CH,COCH, 23.0% C̟H¿O, 49.0% C,H,СНО, 51.0% CH,ОН Acetone-chloroform 64.7 Chloroform-methyl ethyl ketone 79.9 Hydrochloric acid 108.6 Acetic acid-dioxane 119.5 Benzaldehyde-phenol 185.6

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Construct an approximate boiling-point-composition diagram for a benzene– methanol system. The mixture shows azeotropic behavior (see Table 15.3). Include on the graph the boiling points of pure benzene and pure methanol and the boiling point of the azeotrope. Describe the behavior on distillation of a mixture that is initially rich in benzene (90%) and then for a mixture that is initially rich in methanol (90%).

Table 15.3 Maximum-boiling-point azeotropes
Azeotrope
Composition (Weight Percentage)
Boiling Point (°C)
20.0% CH,COCH,, 80.0% CHCI,
17.0% CHCI, 83.0% CH,COCH,CH,
20.2% HCI, 79.8% H,О
77.0% CH,COCH, 23.0% C̟H¿O,
49.0% C,H,СНО, 51.0% CH,ОН
Acetone-chloroform
64.7
Chloroform-methyl ethyl ketone
79.9
Hydrochloric acid
108.6
Acetic acid-dioxane
119.5
Benzaldehyde-phenol
185.6
Transcribed Image Text:Table 15.3 Maximum-boiling-point azeotropes Azeotrope Composition (Weight Percentage) Boiling Point (°C) 20.0% CH,COCH,, 80.0% CHCI, 17.0% CHCI, 83.0% CH,COCH,CH, 20.2% HCI, 79.8% H,О 77.0% CH,COCH, 23.0% C̟H¿O, 49.0% C,H,СНО, 51.0% CH,ОН Acetone-chloroform 64.7 Chloroform-methyl ethyl ketone 79.9 Hydrochloric acid 108.6 Acetic acid-dioxane 119.5 Benzaldehyde-phenol 185.6
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