Solid state equilibrium in the n-alkanols family: the stability of binary mixed samples

Abstract

The stability of binary mixed samples in the normal alkanols family is studied here via the C18H37OH–C20H41OH and C19H39OH–C20H41OH systems. The stability of mixed samples depends on the method used for their preparation. In the samples obtained by the dissolution–evaporation (D + E) method (with diethyl ether), the phases in the solid–solid and solid–liquid equilibria are stable after preparation. However samples obtained by the melting–quenching (M + Q) method (quenching in liquid nitrogen) are only stable for phases in the solid–liquid equilibria. The phases observed in the solid–solid equilibria evolve over time, even after two years’ storage at low temperature (279 K).