STUDY THE EFFECT OF LiCl AS ADDITIVE ON PVDF MEMBRANE FOR CO2/N2 SEPARATION | Journal of Applied...

Flat sheet asymmetric membranes were made utilising a phase inversion approach with N-methyl-2-pyrrolidone (NMP) as the solvent and Lithium Chloride (LiCl) as an additive from a homogeneous solution of Poly(vinylideneflouride) (PVDF). The influence of varying LiCl ratios in the casting solution on membrane characteristics and performance was investigated. Scanning Electron Microscope was used to examine the morphology and cross section of the generated membranes (SEM). The membranes were then chemically analysed using Fourier Transform Infrared (FTIR) spectroscopy to determine the presence of LiCl in the membrane. Using a single gas permeation test, the membranes' permeation performances were assessed in terms of permeability and selectivity in separating the gaseous mixture. The addition of LiCl to the casting solution significantly improved the membrane's shape and structure. At greater LiCl concentrations, macrovoid production was reduced, and very fine pores were created. The selectivity of the PVDF membrane to separate CO2/N2 gases was greatly improved by increasing the LiCl concentration, but the number of gases that flowed through the membrane was significantly reduced.

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