Thermodynamic and kinetic study of the absorption of phosphine by methanol

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, P-31 NMR and gas chromatography. The solubility equation (X-gas = P-e/0.0874.T-19.2653) and kinetic equation (N = 0.0042.T-2 - 0.2006.T + 5.5062) (P-c - P-e)) for the absorption of phosphine are established by investigating the effects of temperature (243.15 K similar to 293.15 K) and total gas pressure (1 MPa similar to 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.