Butane isomer transport properties of 6FDA–DAM and MFI–6FDA–DAM mixed matrix membranes

Separations of binary mixtures of CO2/CH4 and CO2/N2 with mixed-matrix membranes containing Zn(pyrz)2(SiF6) metal-organic framework

“…Mixed-matrix membranes comprising Zn(pyrz)2(SiF6) crystals were fabricated using XLPEO as a polymer matrix. While a "sieve in a cage" morphology has been frequently observed for zeolite/polymer composite membranes due to the poor compatibility between the two phases, [24,[27][28][29] all membrane prepared in this work has showed good adhesion property (Fig.5). This was attributed to a good affinity of the organic ligand in the framework to the PEO chain which possesses a high mobility at room temperature.…”

Olefins-selective asymmetric carbon molecular sieve hollow fiber membranes for hybrid membrane-distillation processes for olefin/paraffin separations

“…As listed in Table 4, for all 5 gas pairs (O 2 /N 2 , C 2 H 4 /C 2 H 6 , CO 2 /CH 4 , He/N 2 , n-butane/ iso-butane) investigated, 6FDA-DAM fibers show almost the same selectivity as dense film values. 6FDA-DAM polyimide was reported to be ideal for butane isomers separation [44,49], and this is the first report of defect-free asymmetric 6FDA-DAM fibers which are able to separate the very challenging n-butane and isobutane mixture. This extends the gas separation application of polymer membranes from small gas molecules to the relatively large molecules such as butane isomers.…”

“…Except butane isomers, all pure gas and binary mixed gas permeation tests were performed at 35 1C. Butane isomers permeation tests were described in previous works [44]. For polymer membranes, low pressure (1-2 atm pressure) hydrocarbons were used as feed in permeation to avoid plasticization.…”

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

“…This method employs a Grignard treatment (GT) method to modify the zeolite surface [128][129][130] and to improve the interfacial adhesion between the zeolite and polymer, the most widespread limitation facing mixed matrix application. The Grignard treatment involves growing Mg(OH) 2 whiskers on the surface, consisting of two steps: (i) a crystal seeding step and (ii) the crystal growth step [131,132]. Fig.…”

“…Therefore, Grignard treatment is also effective on high silica zeolites if an aluminumcontaining zeolite, like 4A is used as an aluminum source. It has been observed that the Grignard treatment is ineffective on silica or high silica zeolite particles because of the lack of appropriate crystal seeds, on which Mg(OH) 2 whiskers can grow [89,128,131].…”