Isobaric vapor–liquid–liquid–solid equilibrium of the water + NaCl + 1-butanol system at 101.3 kPa

• Vapor–liquid–liquid and vapor–liquid equilibrium data are determined.
• Vapor–liquid–solid and vapor–liquid–liquid–solid equilibrium data are determined.
• Results are compared with literature data.
• The influence of salt on water + 1-butanol equilibria is studied.
• The influence of temperature is also studied.

A mixture of water + NaCl + 1-butanol at 101.3 kPa is studied in order to determine the influence of salt on its experimental vapor–liquid–liquid–solid equilibrium. A detailed analysis of the evolution with temperature of the different equilibrium regions is carried out. The study is conducted at a constant pressure of 101.3 kPa in a recirculating still that has been modified by our research group.The changes in the 1-butanol/water composition ratio in the vapor phase that are provoked by the salt are studied as a function of equilibrium region. In addition, the mutual solubility of 1-butanol and water is assessed in the liquid–liquid and solid–liquid regions.

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