28 



Proceediiufs of the Royal Irish Academy. 



It is clear that methyl alcohol cannot form a ternary azeotropie mixture 

 with benzene and wat«r. The point of intersection of the A.B.W. curve 

 with the vertical B.W. boiling-point line appears to be at about 101°. 

 It is uncertain whether secondary butyl alcohol (b.p. 99-6°) forms a ternary 

 mixture ; it is almost certain that tertiary amyl alcohol (b.p. 102°) does not. 

 Alcohols of higher boiling point cannot form ternary azeotropie mixtures with 

 benzene and water. 



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120 



roo 



Alcohol 

 ■bo-Amyl 



■ Ti-Butyl 



'IsoSutyl 

 nPnpyl 





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601 



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Fig. 2. 



The toluene-alcohol curve (fig. 3) is not very suitable for exti'apolation to 

 lower temperatures. As drawn, it might appear to indicate the existence of 

 a methyl alcohol-toluene binary azeotropie mixture. A somewhat belter, 

 but still not very satisfactory, indication can be obtained by plotting the 

 known differences between the boiling points of the alcohols and of the 

 binary alcohol-toluene mixtures against the boiKng points of the alcohols. 

 The curve so obtained leaves it doubtful whether a binary methyl alcohol- 

 toluene mixture should be formed. Xo azeotropie mixture has actually 

 been obtained, but the boiling-point molecular composition curve for 

 methyl alcohol and toluene is extremely flat for mixtures rich in alcohol; 

 and it would be exceedingly difficult to separate puie methyl alcohol from 



