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Phase equilibria data are required for the efficient design of absorption and fractionating equipment, and since hydrogen chloride is assuming a constantly greater role in petroleum refinery operations, it appears desirable to have such data on mixtures of hydrogen chloride with various hydrocarbons.The compositions of equilibrium vaporliquid mixtures in the hydrogen chloriden-butane system have been determined at temperatures of 70°, 1 2 0 ' , and 180' F. for pressures below 550 pounds per square inch, using a constant volunie type apparatus. The data, which are presented in both tabular and graphical form as pressure-coniposition and equilibrium constant-pressure diagrams, indicate general agreement with Raoult's law.

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