Oxygen enrichment across blend membranes of bipyridine and ethyl cellulose

Abstract

Blend membranes of 2,2Ј-bipyridine (2BP) or 4,4Ј-bipyridine (4BP) with ethyl cellulose (EC) containing no more than 25 wt % BP are prepared and evaluated for their oxygen enrichment by both the constant pressure-variable volume method and the constant volumevariable pressure method. The actual air-separation ability through the 2BP/EC blend membrane containing 1.5-7 wt % 2BP are enhanced while the permeated flux is slightly increased in comparison with the virgin EC membrane. Among the 2BP/EC blend membranes examined, the 2BP/EC blend membrane containing 3 wt % 2BP offers the best oxygen/nitrogen permselectivity and yields the highest oxygen concentration of 42.7% at the transmembrane pressure difference of 0.75 MPa and 25°C.Like other homogeneous dense membranes, the BP/EC blend membrane demonstrates strong dependencies on the transmembrane pressure difference, retentate/permeate flux ratio, and operating temperature. It possesses higher activation energy of oxygen and nitrogen permeation than those of the virgin EC membrane in the tested temperature range of 9.7-60°C. The CO 2 over CH 4 permselectivity through EC membranes can be improved by introducing 4BP, and the ideal oxygen over nitrogen separation factor through the 4BP/EC (10/90) membrane increases 16% at the upstream pressure of 10 bar compared with the virgin EC membrane.

Influence of Blend Composition and Silica Nanoparticles on the Morphology and Gas Separation Performance of PU/PVA Blend Membranes

“…Polymer blending and mixed-matrix membranes (MMMs) are attractive techniques for the development of membranes with high separation performance. In particular, polymer blending is a simple approach to combine the advantages of a highly permeable and a highly selective polymer pair to improve the properties of polymer membranes [7,8,9,10]. Besides, it has been shown that the incorporation of inorganic particles (e.g., silica, MOFs, zeolites) to a polymer matrix can improve the separation performance, mechanical properties, and control the aging and plasticization of the membranes [11,12,13,14].…”

Performance of plasma source and irradiation for optical properties improvement of gelatin/silver composite

“…Additionally, it possesses functional groups that are reachable and allow for chemical changes, such as the coupling with cross‐linkers that permits the construction of tailored drug delivery systems [17]. Furthermore, due to its adaptable activities, it can be employed in tissue engineering applications as a matrix promoting therapeutic cell adhesion without impairing cell phenotypes [18]. Additionally, gelatin has the potential to be employed as an electrolyte in several applications, such as electrochromic devices and dye‐sensitized solar cells [19–21].…”

Propylene-induced plasticization in silver polymer electrolyte membranes

“…Understanding plasticization process and assessing its effect on membrane performance have been widely studied over the past decade [1][2][3][4][5][6]. Plasticization phenomena are most frequently observed for separations involving CO 2 in the feed side.…”