Solution and diffusion properties of organic sulfur in poly[bis(phenoxy)phosphazene] by inverse gas chromatography

• PBPP was firstly studied on solution and diffusion properties by IGC technique.
• The IGC data was consistent with the pervaporation performance.
• The study is assistance to investigate transferring mechanism of pervaporation.

In this work, the solution and diffusion properties of n-heptane, thiophene, 2-methylthiophene, 2,5-dimethylthiophene, ethyl sulfide, butyl mercaptan in poly[bis(phenoxy)phosphazene] (PBPP) were studied by inverse gas chromatography. The infinite dilute activity coefficients and diffusion coefficients were determined. Effects of temperatures and solvent species on the activity coefficients and diffusion coefficients were investigated. The results showed that higher temperature was beneficial for both solution and diffusion process. Compared with pervaporation desulfurization performance in our previous work, the order of infinite dilute diffusion coefficients was in agreement with that of partial flux, which indicated that diffusion decided the permeability within solution–diffusion model.

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