关键词: 汽液平衡, 水, 乙酸, 乙酸戊酯

Abstract: Isobaric vapor-liquid equilibria(VLE) data for water-acetic acid, acetic acid-n-pentyl acetate, and water-acetic acid-n-pentyl acetate systems were measured at 101.33 kPa using an improved Rose still. The quality of the measured binary data was verified by using the thermodynamic consistency test.The association of acetic acid in vapor phase was considered.And the nonideality of vapor phase was corrected by Virial and Hayden-O’connell equations. The binary interaction parameters for the determination of liquid phase activity coefficients, expressed by the UNIQUAC and NRTL models, were obtained by applying the nonlinear least square method. The obtained NRTL model parameters from binary data were used to predict the ternary VLE data. For ternary system, the average absolute deviations(AAD) in vapor-phase mole fraction of water and acetic acid were independently 0.0230 and 0.0222 and AAD in the equilibrium temperature was 1.15 ℃.

Key words: 汽液平衡, 水, 乙酸, 乙酸戊酯