Abstract
The vapor-liquid equilibrium of phenolic substance (phenol, o-cresol, m-cresol, thymol and α-naphthol) -water system was measured by using Othmer type of equilibrium distillation apparatus. The measurement was conducted under the conditions that the pH range was 6 to 8, the system pressure range 360mmHg to 2atm and the salinity range upto about 7%.
The vapor-liquid equilibrium ratio of each phenolic substance in these systems increased as the salinity of solution or the system pressure increased. However, pH value had no remarkable effect on K-value, and the variation of salinity had the largest effect.
The relative volatilities of these five phenols indicated the following decline:
hymol>o-Cresol>m-Cresol>Phenol>α-Naphthol.
Phenol,o-cresol,m-cresol and thymol except α-naphthol in the feed sea-water seemed to be concentrated into product water in an MSF desalination plant.
Simple batch distillation tests of phenol-water and α-naphthol-water system were conducted in an atmospheric pressure, at pH 7 and with some salinities. The calculated values obtained from Rayleigh's equation by using the vapor-liquid equilibrium of each system showed a considerable coincidence with the results of the distillation tests.
hus, the behavior of each phenolic substance in an MSF plant can be simulated by conducting of simple batch distillation.
