Pure water ILMs

Table II. CO -N Separation Behavior through Pure Water ILM-s in Celgard X-10 Hollow Fibers ...

An alternative approach to solving stability problems with ILMs is presented by Bhave and Sirkar (114). Aqueous solutions are immobilized in the pore structure of hydophoblc, polypropylene hollow fibers by a solvent exchange procedure. Gas permeation studies are reported at pressures up to 733 kPa with the high pressure feed both on the shell and lumen sides of the laboratory scale hollow fiber permeator. No deformation of the hollow fibers is observed. Immobilizing a 30 weight % KjCO, solution in the hollow fibers greatly improved the separation factor, a(C02/Na). from 35.78 with pure water to 150.9 by a facilitated transport mechanism. Performance comparisons with commercial COj separation membranes are made. 

This paper describes pure N2 permeation and CO2-N2 separation characteristics of ILM-s of pure water and aqueous 302 wt/wt K2CO3 solutions Immobilized in Celgard X-10 hollow fibers. Measurements were carried out over a wide range of applied pressure differences. The CO2 partial pressure difference was varied from about 40 cm Hg to 140 cm Hg while the N2 partial pressure difference was Increased from about 125 cm Hg to 425 cm Hg. The total applied pressure difference was varied between 140 to 550 cm Hg. Facilitated transport membranes of aqueous 3UZ wt/wt K2CO3 solution for the separation of CO2 from were utilized and the separation behaviors... 

Figure 1 shows the schematic of the apparatus employed for the preparation of aqueous ILM-s In microporous Celgard hydrophobic hollow fibers. Pure water was first Incorporated In the pores of the microporous Celgard X-10 hollow fiber supports all across the... 

For Incorporating aqueous K2C0 solution In the fiber pores, we started with fibers contlanlng pure water In the pores. Aqueous K CO ILM-s were obtained by replacing pure water in the pores of Celgard X-10 hollow fibers by contacting with aqueous 30% wt/wt... 

The experimental determination of oqq requires measuring the CO2 and N2 permeation rates through an ILM of pure water... 

---