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The vapour–liquid equilibrium behaviour of two carboxylic acid systems was studied; viz. propionic acid (1)–valeric acid (2) and isobutyric acid (1)–valeric acid (2). For each system, a single isobar at 20kPa and three isotherms at 393.15, 403.15 and 413.15K, respectively, were measured. Liquid-phase activity coefficients were determined using a procedure based on the chemical theory for the vapour...
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