The total pressure and vapor and liquid compositions have been measured for water + diacetone alcohol at 340.00 K and 370.00 K and for ethyl methanoate + phenol and ethyl methanoate + water at 300.00 K and 320.00 K. Measurements were made by either a recirculating still or a transpiration method depending on the total pressure of the mixture. The results were correlated using the Redlich-Kister equation, the Wilson equation, and the NRTL equation, with allowance for vapor nonideality.