PVT properties of binary systems of diisopropylethylammonium octanoate ionic liquid with oligomeric polyethylene glycol or polypropylene glycol at elevated pressures
作者:Ardila Hayu Tiwikrama、Pei-Kang Yen、Ming-Jer Lee
DOI:10.1016/j.molliq.2021.115646
日期:2021.6
The densities were measured for two binary systems of protic ammonium-based ionic liquid, diisopropylethylammonium octanoate ([DIPEA][C7COO]), with oligomeric polyethylene glycol (PEG-200) or polypropylene glycol (PPG-425) at temperatures from 298.2 K to 348.2 K and pressures up to 50 MPa. Tait equation was used to represent the pressure-dependence of the liquid densities and then applied to estimate
在298.2的温度下,测量了两种基于质子铵离子液体的二元体系辛酸二异丙基乙基铵([DIPEA] [C 7 COO])和低聚聚乙二醇(PEG-200)或聚丙二醇(PPG-425)的密度。 K至348.2 K,压力最高50 MPa。用泰特方程表示液体密度的压力依赖性,然后将其用于估算等温压缩率。在整个组成范围内,[DIPEA] [C 7 COO] + PEG-200的过量摩尔体积为负,而[DIPEA] [C 7COO] + PPG-425随离子液体的摩尔分数变化而呈S形,从正变负。虽然将多余的体积拟合到修改后的Redlich-Kister方程,但将密度数据与广义方程以及Flory-Orwoll-Vrij(FOV)和状态Schotte方程相关。