Determination of infinite dilution activity coefficient in ethanol-water-salt systems using spme-gc-fid

Química Nova

Universidade Federal Rural do Rio de Janeiro, Seropédica, Brasil¹  Coelho, Gerson Luiz Vieira¹  Elias, Andrew Milli¹  Furtado, Filipe Arantes¹ 

关键词: solid-phase microextraction (SPME);    activity coefficients;    salt effect;    gas chromatography;    phase equilibrium.;   

DOI  :  10.5935/0100-4042.20140178

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

A new method using the headspace solid phase microextraction (HS-SPME) technique was used to evaluate the infinite dilute activity coefficient (γ1∞) in an alcohol/water/salt system. The studied systems were ethanol and water with NaCl and NH4Cl at salt concentrations of 5, 10, 15, and 30% m/v and temperatures of 303.15 and 313.15 K. The method was used to investigate the salt effect on vapor/liquid equilibrium in an ethanol/water system, yielding satisfactory results. The study focused on the rich side in ethanol. The data were compared with the literature infinite dilution data determined by other methods such as differential ebulliometry (EBUL), differential static cell equilibrium (STAT), and gas-liquid chromatography with no gas phase correction (GC). In this study, NaCl showed better separation rates than NH4Cl.

【 授权许可】

Unknown