Although VLE-data are known from literature, there is still an increasing tendency towards redetermining equilibrium data by experiments, because the thermodynamic parameters like pressure, temperature and concentrations are different or inadequate.
For designing e.g. extractive distillation processes the evaluation of vapour-liquid-liquid phase equilibria (VLLE-data) are required. The practical measurement and determination of these data proves difficult with the standardised VLE-units because of the phase formation of the liquids.
The VLLE device of LUDEST® / i-Fischer® is designed/produced according to Patent ES 2 187 220 B2 of the University of Alicante.