MEASUREMENTS OF SATURATED VAPOR-PRESSURE ABOVE THE LIQUID-PHASE FOR ISOMERIC DICHLOROBENZENES AND 1,2,4-TRICHLOROBENZENE

Saturated vapor pressures have been measured for liquid 1,2-dichlorobe nzene, 1,3-dichlorobenzene, 1,4-dichlorobenzene, and 1,2,4-trichlorobe nzene by precision comparative ebulliometry over an approximate pressu re range from 6 to 105 kPa. The relative error in pressure is estimate d to be less than or equal to +/-0.05% of the measured value and the a bsolute error in temperature is estimated at less than or equal to +/- 0.01 K on ITS-90. The results have been represented by the Antoine and Wagner-type equations within experimental uncertainties and compared with the data so far available in the literature. On the basis of the present and previous measurements, vapor pressure equations for the ch lorobenzenes covering the entire range of liquid existence have been c onstructed and discussed.