Vapour‐liquid equilibria in ternary systems: I. The course of the distillation lines

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Abstract
For the practical use of liquid‐vapour equilibria in ternary systems the curves of simple distillation and of rectification are of great importance. A discussion is given about the course of these lines.In many systems the curves of simple distillation may be arranged in different bundles, separated by curved boundary lines. In some systems a boundary line for simple distillation may induce a similar boundary line for rectification, which, however, in other systems may be lacking.On rectifying, the change in composition of the boiling liquid will be determined by the distillate with minimum boiling point, and will therefore be indicated in the diagram by a straight line. When, however, the composition of the liquid reaches a point of a boundary line for rectification. It has to follow this line on further rectification. The composition of the distillate is then determined by the tangent to the boundary line; so it has to change gradually during prolonged rectification.

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