An investigation to revitalize the separation performance of hollow fibers with a thin mixed matrix composite skin for gas separation

Polymeric mixed matrix membranes containing zeolites as a filler for gas separation applications: A review

“…The most important issues in MMMs hollow fibers are (1) how to make mixed matrix layer thickness as thin as possible; (2) how to reduce defects in the selective skin and (3) how to really take advantage of the high-selective nature of zeolite molecular sieves. For high rates of production, the dense separating layer of the membrane must be as thin as possible, yet strong enough to withstand considerable transmembrane pressure differential driving forces [94]. Such an arrangement is ideally achieved with asymmetric hollow fibers, which consist of a thin dense layer (skin) and a porous support layer [93].…”

Relationship between polymer–filler interfaces in separation layers and gas transport properties of mixed matrix composite membranes

“…Most research has primarily focused on the forms of hollow fiber and flat membranes of which the properties have been discussed in detail [18][19][20][21][22][23][24][25][26][27]. However, systematic research in the morphology of the polymer-filler interface is hardly reported for the mixed matrix composite membrane.…”

“…Removing voids is a challenging subject for the mixed matrix composite membrane because its separation layer composed of polymer phase and inorganic dispersed phase is ultrathin, and has only several micrometers at most. For the mixed matrix composite membranes, there are several posttreatment methods to avoid the voids such as heat treatment and two-step coating, and p-xylenediamine/methanol soaking [20][21][22][23]. For example, Jiang et al combined heat treatment and two-step coating processes to bring out the separation properties of zeolite beta imbedded in the polymer matrix for defect-free PSF-Zeolite Beta/Matrimid5218 hollow fiber membrane [20].…”

Polysulfone membranes for CO2/CH4 separation: State of the art

“…Porous material inorganic enhance the gas separation properties by molecular sieving while non-porous inorganic material do that by conditioned the free volume of www.iosrjen.org 491 | P a g e the matrix. The common inorganic materials used to produce MMM are zeolites [60,61,62,63,64], ordered mesoporous silica [65,66], nonporous silica, carbon molecular sieves, and carbon nanotubes [67].…”