Solid-liquid equilibria of some natural phenolic compounds: experimental and modelling

Abstract

Phenolic compounds are typically found in plants, usually as estersor glycosides [1]. Apart from being starting materials for many chemicalsynthesis, there is also huge evidence that some phenolic compounds havebeneficial effects on human health.In this work, the aqueous solubilities of some phenolic compoundssuch as the hydroxybenzoic acids gallic, salicylic, protocatechuic andsyringic acids, and the phenilpropenoic acids caffeic, cinnamic, ferulic andcoumaric acids are addressed. Measurements were performed, as a functionof temperature, between 288 K and 323 K, at atmospheric pressure, usingconstant-temperature jacketed equilibrium glass cells.Approaches for modelling the measured data were evaluated,including the modified UNIQUAC model [2] and the CPA equation of state[3].