VLLE of binary aqueous systems containing 2-butanol, isobutanol, or tert-amyl alcohol

• Published in: Fluid phase equilibria Vol. 550; p. 113255
• Main Authors: Khudaida, Salal Hasan, Yang, Ning-Ju, Peng, Ding-Yu, Lee, Ming-Jer
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15-12-2021
• Subjects: 2-butanol; Isobutanol; Tert-amyl alcohol; VLLE; Water; Water; Tert-amyl alcohol; 2-butanol; Isobutanol; VLLE
• ISSN: 0378-3812; 1879-0224
• DOI: 10.1016/j.fluid.2021.113255

•Isothermal VLLE data were measured.•The investigated aqueous systems contain 2-butanol, isobutanol, or tert-amyl alcohol.•Homogeneous azeotrope forms in water + 2-butanol system.•Heterogeneous azeotrope forms in water + isobutanol and + tert-amyl alcohol systems.•The NRTL and the UNIQUAC were used to correlate the VLLE data.
Isothermal vapor-liquid-liquid equilibrium (VLLE) data were measured for water + 2-butanol, water + isobutanol, and water + tert-amyl alcohol at temperatures from 323.12 K to 373.16 K. A modified static-type apparatus equipped with a visual cell was used in the present study. The experimental results confirm that homogeneous azeotrope forms in water + 2-butanol and heterogeneous azeotrope forms in water + isobutanol and in water + tert-amyl alcohol. The VLLE data of the investigated binary systems were correlated well with the NRTL and the UNIQUAC models.
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