VAPOR-LIQUID-EQUILIBRIA FOR MIXTURES OF ETHYLENE-GLYCOL, PROPYLENE-GLYCOL, AND WATER BETWEEN 98-DEGREES AND 122-DEGREES-C

Catalytic hydrocracking of sorbitol constitutes an interesting possibi lity of using excess production of cereals. Such reaction leads to an aqueous solution of ethylene and propylene glycol, butanediols, glycer ol, alcohols, which is then distilled with the aim of separating the d ifferent species present. Since few equilibrium data have been publish ed for this kind of mixtures, the first part of the present work was a imed at producing isothermal vapor-liquid equilibrium data in the rang e of 98 degrees-122 degrees C for the three binary solutions which can be obtained from water, ethylene glycol and propylene glycol. Afterwa rds, the equilibrium data were correlated by means of the UNIQUAC mode l, and the binary interaction parameters were evaluated. Eventually, t he equilibrium conditions for the ternary mixture ethylene glycol-prop ylene glycol-water were experimentally determined, ant it was shown th at the UNIQUAC model is capable of estimating with very good accuracy the equilibrium conditions for such mixture.