Thermodynamic and kinetic study of the absorption of phosphine by methanol

• Published in: Separation and purification technology 2024-07, Vol.339, p.126647, Article 126647
• Main Authors: Yang, Yifan, Nie, Yunxiang, Qin, Yuxin, Wen, Zhangnan, Mei, Yi
• Format: Article
• Language: English
• Subjects: Absorption mechanism; Kinetic; Methanol; Phosphine; Physical absorption
• ISSN: 1383-5866; 1873-3794
• DOI: 10.1016/j.seppur.2024.126647

[Display omitted] •A novel dephosphorization method is proposed firstly by using methanol as absorbent.•The solubility equation for phosphine absorption is established.•The kinetic equation for phosphine absorption is established.•The phosphine absorption mechanism is revealed. Phosphine is a highly toxic gas that not only endangers human life and health, but also causes environmental pollution and damage to animals and plants. Herein, a novel dephosphorization method has been proposed for the first time by employing methanol absorbent. The methanol absorbent dephosphorization process is proven to be a physical absorption process, based on the characterization of FT-IR, 31P NMR and gas chromatography. The solubility equation (Xgas=Pe0.0874·T-19.2653) and kinetic equation (N=0.0042·T2-0.2006·T+5.5062Pc-Pe) for the absorption of phosphine are established by investigating the effects of temperature (243.15 K ∼ 293.15 K) and total gas pressure (1 MPa ∼ 3 MPa) on the solubility and absorption rate of phosphine. In addition, the absorption of phosphine by methanol exhibits a low enthalpy change and excellent regenerative performance, indicating that methanol is an energy-efficient and renewable phosphine absorbent. Subsequently, the mechanism of phosphine absorption is discussed. This study provides an alternative dephosphorization method, which can deeply purify phosphine and recycle phosphorus resource.