Resumo

BENDER, J. P. et al. High-pressure cloud point data for the system glycerol + olive oil + n-butane + AOT. Braz. J. Chem. Eng. [online]. 2008, vol.25, n.3, pp. 563-570. ISSN 0104-6632.  http://dx.doi.org/10.1590/S0104-66322008000300014.

This work reports high-pressure cloud point data for the quaternary system glycerol + olive oil + n-butane + AOT surfactant. The static synthetic method, using a variable-volume view cell, was employed for obtaining the experimental data at pressures up to 27 MPa. The effects of glycerol/olive oil concentration and surfactant addition on the pressure transition values were evaluated in the temperature range from 303 K to 343 K. For the system investigated, vapor-liquid (VLE), liquid-liquid (LLE) and vapor-liquid-liquid (VLLE) equilibrium were recorded. It was experimentally observed that, at a given temperature and surfactant content, an increase in the concentration of glycerol/oil ratio led to a pronounced increase in the slope of the liquid-liquid coexistence curve. A comparison with results reported for the same system but using propane as solvent showed that much lower pressure transition values are obtained when using n-butane.

Palavras-chave : Phase equilibria; N-butane; AOT surfactant; Glycerolysis.