Oxygen removal from gas with phosphine manganous halide complex - using predried gas to prevent deactivation of complex by water

摘要

In the removal and opt. recovery of O2 from gas by treatment with phosphine complexes with Mn (II) halides, the gas, if moist, is predried. Drying prevents an irreversible change, so that the complex retains a large fraction of its activity and can be used for continuous exchange. The complexes are useful for sepg. O2 from air in confined spaces, e.g. ships and aircraft, for removing traces of O2 from gases and esp. as detectors for the O2 content of gases, since they are intensely coloured when combined with O2 and colourless to pale yellow when free from O2. In an example, air was passed into 10 g 9 wt.% soln. of the dimethylphenylphosphine-Mn (II) bromide complex in THF at 20 deg.C and normal pressure. The soln. was yellowish initially and became intensely coloured very rapidly. If 2 ml water were added, the colour disappeared immediately and the O2 binding complex was destroyed. If O2 was introduced again, it was no longer bound. If 60 ml BuOH were added, the complex was destroyed within 15 min.