Effect of Moisture Presence on Gas Permeability through Gas Separation Membranes Based on Poly(Vinyltrimethylsilane) and Quaternized Chitosan

Abstract

An experimental evaluation of the humidity effect of gases (nitrogen, methane, and carbon dioxide) on their permeability through poly(vinyltrimethylsilane) and quaternized chitosan membranes using a specially designed experimental setup has been performed in this work. The experimental unit has been additionally equipped with a moisture generator and an analytical complex including an electronic hygrometer coupled with a gas chromatographic TCD system. The gas humidity values were obtained before and after the separation on polymeric membrane. It has been experimentally shown that the PVTMS membrane in the presence of water vapor (up to 2.5 vol %) provides the stability of gas transport characteristics. The permeability of moist gases through the quaternized chitosan membrane has been significantly reduced due to the high affinity of the polymer to water vapor and this material provides the high water vapor permeability.

Thin‐film hydrogel polymer layered polyvinyltrimethylsilane dual‐layer flat‐bed composite membrane for CO2 gas separation

“…Certain studies explored the lower gas permeability of hydrogel CS biopolymer network in a dry state, whereas in water-swollen state remarkable greater permeability and separation of CO 2 over other gases was reported. [43][44][45] In the current study planned to perform the gas transport experiment under both dry and water wetted states and compare the variation of gas separation performance. For the comparison purpose, the gas permeation experiment was assessed in pure PVTMS film by both dry and water wetted state.…”

“…These results are well supported by several literatures. [43][44][45] They reported that the dry CS membranes shows low permeability whereas water swollen membrane shows enhanced CO 2 gas transport significantly over other gases (N 2 , CH 4 , and H 2 ). Further, the high CO 2 gas separation performance of PVCPG composite film in both dry and water-swollen membrane could be related to physico-chemical interaction of PEG and the CS polymer matrix.…”

“…At this situation the corresponding significant growth of gas pair selectivity was observed on the PVCPG composite film. 43 Thus, it is expected that the newly introduced CS and its polymer blend surface layered PVTMS composite membrane is the good candidate for CO 2 gas separation application.…”

Hydrogen Sulphide Sequestration with Metallic Ions in Acidic Media Based on Chitosan/sEPDM/Polypropylene Composites Hollow Fiber Membranes System

“…The membranes used for the removal, separation, concentration, analysis, and valorization of hydrogen sulfide are based on ionic polymers [ 37 , 38 ], biopolymers [ 39 , 40 ], organic [ 41 ], or inorganic composites [ 42 ]. Among the ionic polymers, sulfonated polyether ether ketone and sulfonated ethylene–propylene–diene terpolymer (sEPDM) are used [ 43 ], while among biopolymers, chitosan (Chi) is of particular interest, because it covers various membrane separations and spans the membranes for sensors [ 44 , 45 , 46 , 47 , 48 , 49 , 50 ].…”

Perspectives for chitosan‐based membranes in CO2/N2 separation : Structure‐property relationship

“…In addition, the polyelectrolytic nature of CS helps in incorporation of other external amines or fillers into the membrane system. Although the pristine chitosan and its composites are extensively studied experimentally145 and using mathematical models146 for CO 2 separation purpose, recently other CS derivatives like CMC147 or quaternized CS148 have been investigated by various researchers as well. In these works, the membranes were studied at different operating conditions along with the varied behaviour shown by them during CO 2 permeation.…”