Preparation, characterization, and performance evaluation of coated PES polymer materials fabricated via dry/wet phase inversion technique

摘要

Sulfur dioxide (SO_2) is the major air pollutant which is emitted from the power plant. In this study, hollow fiber membrane (HFM) separation process is applied for the improvement of SO_2 removal efficiency in the post-combustion gas. HFM was produced by dry/wet phase inversion method and then coated with Polydimethylsiloxane (PDMS). The membrane morphology and characterization were examined with help of scanning electron microscope (SEM), energy dispersion of X-ray spectroscopy (EDX), Fourier transform infrared (FT-IR) and atomic force microscopy (AFM). Polyethersulfone (PES) hollow fiber membranes were tested for the SO_2/N_2 binary mixed gas separation. Single gas permeance of SO_2, N_2, and binary mixture gas (200 ppm of SO_2) separation experiment was initiated to observe membrane behavior according to temperature and pressure difference and retentate flow rate. As a result, permeance of SO_2 was 24.9-47.4 GPU and selectivity of SO_2/N_2 was 1.6-4.2. From the mixture gas separation experiment, SO_2 removal efficiency increased according to stage cut and operating pressure.