In this study

the solubility of

m

-phenylenediamine in four pure solvents (methanol

ethanol

acetonitrile and water) and three binary solvent (methanol + water)

(ethanol + water) and (acetonitrile + water) systems were determined in the temperature ranging from 278.15 K to 313.15 K by using the gravimetric method under atmospheric pressure. In the temperature range of 278.15 K to 313.15 K

the mole fraction solubility values of

m

-phenylenediamine in water

methanol

ethanol

and acetonitrile are 0.0093-0.1533

0.1668-0.5589

0.1072-0.5356

and 0.1717-0.6438

respectively. At constant temperature and solvent composition

the mole fraction solubility of

o

-phenylenediamine in four pure solvents was increased as the following order:water ethanol methanol acetonitrile; and in the three binary solvent mixtures could be ranked as follows:(ethanol + water) (methanol + water) (acetonitrile + water). The relationship between the experimental temperature and the solubility of

m

-phenylenediamine was revealed as follows:the solubility of mphenylenediamine in pure and binary solvents could be increased w

ith the increase of temperature. The experimental values were correlated with the Jouyban-Acree model

van't Hoff-Jouyban-Acree model

modified Apelblat-Jouyban-Acree model

Sun model and Ma model. The standard dissolution enthalpy

standard dissolution entropy and the Gibbs energy were calculated based on the experimental solubility data. In the binary solvent mixtures

the dissolution of

m

-phenylenediamine could be an endothermic process. The solubility data

correlation equations and thermodynamic property obtained from this study would be invoked as basic data and models regarding the purification and crystallization process of

m

-phenylenediamine.