Biphasic Cellulose Acetate/Rtil Membranes And Functionalized Graphene Adsorbents For Natural Gas Processing: Experimental And Molecular Simulation Studies
type: CreativeWork
description: In this dissertation, gas separation using membranes is investigated for natural gas upgrading. The main objectives of this study are separation of high value hydrocarbons such as propane (c3h8) from natural gas and carbon dioxide (co2) separation from light gases such as nitrogen (n2) and methane (ch4). To achieve these goals, supported ionic liquid membranes (silms), biphasic membranes, and nanoporous graphene (npg) and graphene oxide (npgo) membranes are studied. Biphasic membranes are proposed to overcome silms issues for gas separation. The major issues with silms are low room temperature ionic liquid (rtil) content and instability at high cross-membrane pressure. For this purpose, single and biphasic cellulose acetate (ca)/[emim][scn] membranes were fabricated using the solution casting and solution casting/phase inversion methods, respectively. Infrared spectra and atomic force micrographs were generated to characterize the fabricated membranes. Moreover, the transport properties of co2, n2, ch4, and c3h8 gases through the ca/[emim][scn] dope membrane (single phase), cast biphasic ca/[emim][scn] membrane, and supported [emim][scn] membrane were determined using a batch gas permeance system and a continuous flow instrument. The results indicate that the silm has the highest and the dope membrane has the lowest permeability for co2 and c3h8. The cast biphasic membrane and silm give almost similar permeabilities for these gases. The stability of the dope, biphasic, and silm membranes are further determined, indicating there is a breakthrough point for all membranes. This point for the biphasic and silm membranes corresponds to a similar pressure. This shows that biphasic membranes have potential to compete with silms for gas separation applications by improving casting procedure. The dope membrane is less stable at high pressures than the biphasic and silm membranes, since it is in liquid state. Molecular dynamics simulations were performed to gain fundamental m…
abstract: In this dissertation, gas separation using membranes is investigated for natural gas upgrading. The main objectives of this study are separation of high value hydrocarbons such as propane (c3h8) from natural gas and carbon dioxide (co2) separation from light gases such as nitrogen (n2) and methane (ch4). To achieve these goals, supported ionic liquid membranes (silms), biphasic membranes, and nanoporous graphene (npg) and graphene oxide (npgo) membranes are studied. Biphasic membranes are proposed to overcome silms issues for gas separation. The major issues with silms are low room temperature ionic liquid (rtil) content and instability at high cross-membrane pressure. For this purpose, single and biphasic cellulose acetate (ca)/[emim][scn] membranes were fabricated using the solution casting and solution casting/phase inversion methods, respectively. Infrared spectra and atomic force micrographs were generated to characterize the fabricated membranes. Moreover, the transport properties of co2, n2, ch4, and c3h8 gases through the ca/[emim][scn] dope membrane (single phase), cast biphasic ca/[emim][scn] membrane, and supported [emim][scn] membrane were determined using a batch gas permeance system and a continuous flow instrument. The results indicate that the silm has the highest and the dope membrane has the lowest permeability for co2 and c3h8. The cast biphasic membrane and silm give almost similar permeabilities for these gases. The stability of the dope, biphasic, and silm membranes are further determined, indicating there is a breakthrough point for all membranes. This point for the biphasic and silm membranes corresponds to a similar pressure. This shows that biphasic membranes have potential to compete with silms for gas separation applications by improving casting procedure. The dope membrane is less stable at high pressures than the biphasic and silm membranes, since it is in liquid state. Molecular dynamics simulations were performed to gain fundamental m…
author: Khakpay, Amir
keywords: Casting, Graphene, Ionic Liquid, Membrane, Separation, Chemical Engineering
date published: 2017-01-01T08:00:00Z
date modified: 2026-07-24T03:06:07Z
provider: University of Mississippi
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: University of Mississippi