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oai:figshare.com:article/34034173 2026-09-30T17:12:35Z category_4 category_8 category_21 category_272 category_873 category_46 category_734 category_106 portal_63 item_type_6 month_year_09_2026

Salt-Dependent Liquid–Liquid Equilibria and Pyridine Partitioning in Water + Pyridine + 2‑Ethyl-1-hexanol Systems with KCl and CaCl₂ Jingli Sun (10922479) Yujie Zhen (17008071) Siyu Zheng (8053868) Lei Chen (54296) Kebin Huang (24220081) Yingmin Yu (5589059) Biochemistry Microbiology Biotechnology Environmental Sciences not elsewhere classified Chemical Sciences not elsewhere classified Immunology Biological Sciences not elsewhere classified Science Policy thermodynamic model parameters thermodynamic consistency tests regressed model parameters inorganic salts expand gibbs stability criteria experimental results show experimental lle data correlated using nrtl enhance separation efficiency pyridine distribution coefficient saline aqueous systems pyridine extraction performance promote pyridine partitioning 2 ‑ ethyl 2 </ sub pyridine partitioning pyridine extraction aqueous pyridine separation processes hexanol systems systematically studied phase region organic phase hexanol system free system concentration effects approximately 42 3 kpa 15 k 02 %. To investigate salt-type and salt-concentration effects on pyridine extraction performance, liquid–liquid equilibrium data for the aqueous pyridine +2-ethyl-1-hexanol system with KCl or CaCl₂ were measured at 298.15 K and 101.3 kPa. Aqueous phases containing 5 and 10 wt % KCl and CaCl₂ were systematically studied. Experimental results show that both inorganic salts expand the two-phase region, promote pyridine partitioning into the rich-organic phase, and enhance separation efficiency. The pyridine distribution coefficient and separation factor generally increase with the salt concentration. Relative to the salt-free system, the average separation factor rises by approximately 42.01% and 111.10% for 5 and 10 wt % KCl, respectively, and by 19.17% and 74.27% for the corresponding CaCl₂ concentrations, respectively. Experimental LLE data were correlated using NRTL and UNIQUAC activity coefficient models, with RMSD below 1.02%. Thermodynamic consistency tests and Gibbs stability criteria further validate the reliability of the regressed model parameters. This work provides credible LLE data sets and thermodynamic model parameters for the design and optimization of pyridine extraction and separation processes in saline aqueous systems. 2026-09-30T00:00:00Z Text Journal contribution 10.1021/acs.jced.6c00423.s001 https://figshare.com/articles/journal_contribution/Salt-Dependent_Liquid_Liquid_Equilibria_and_Pyridine_Partitioning_in_Water_Pyridine_2_Ethyl-1-hexanol_Systems_with_KCl_and_CaCl_sub_2_sub_/34034173 CC BY-NC 4.0