Purifying PH3 with Cu2+ Absorption Solution

Cu absorption solution was investigated for purifying PH_3, CuSO₄, CuCl₂, Cu(NO₃)₂ and Cu(CH₃COO)₂ supply Cu²⁺ for Cu²⁺ absorption solution in experiments. CuSO₄ solution showed the highest PH₃ purification efficiency under the condition of 50°C, 200 mL/min and O₂ 2%, the PH₃ concentration in exit gas streams was 0 ppm before 250 min. Main influence factors for reaction temperature, gas flow rate, pH and O₂ content were also studied, the purification efficiency of PH₃ was enhanced with reaction temperature increasing, but slower gas flow was good for removing PH₃. The results indicated that good conditions of the reaction were 70°C, gas flow rate of 200 mL/min, O₂ content of 2% and pH = 3.