Novel methods in separation of olefin/paraffin mixtures by functional polymeric membranes

Gaseous Hydrocarbon Separations Using Functionalized Ionic Liquids

“…The propylene absorption capacity for the ionic liquids-silver salt solution was compared to aqueous solutions with the same silver salt concentration and it was found that the aqueous solutions presented lower propylene capacities. Although allowing the increase of the capacity and selectivity of the selected support for the unsaturated gas, the use of metals presents drawbacks due to their cost, contamination, degradation, safety problems, limited metal salt solubility and high viscosities of the resulting liquid absorbent [26,35,37,38,39]. A detailed engineering analysis is out of the scope of the present paper but would most certainly be necessary in order to properly compare these new technologies based on the use of ionic liquids with traditional processes such as cryogenic distillation.…”

Kinetics of Ag+ contained polymeric complex membranes for facilitated olefin transport

“…6 Therefore, poly(acrylic acid)-grafted polymeric membranes are sufficient for silver ion immobilization used for olefin/paraffin separations, Polyacrylates are known to form complexes with thereby enhancing facilitated olefin transport. [7][8][9] metal ions of various valents. 1 The average coordiAn increase in the solubility of unsaturated hynation numbers for a bivalent metal-poly(acrylic drocarbon compounds in aqueous silver nitrate soacid) complex is equal to 2.…”

“…12 Previous investigators obtained various electron transfer from the carboxylates to the stoichiometric ratios (e.g., 1/1, 2/1, 3/1) of alkene-Ag / complexes for low molecular weight olefins in aqueous solution (e.g., ethene, propene, the reversible complex phenomenon of alkeneThe coordination number (n) and the formation equilibrium constant (K) of the PE-g-AA memAg / complex to facilitated olefin transport. [7][8][9][13][14][15] Also, Noltes indicated that the inductive effects brane binding with Ag / ion was determined as follows: the PE-g-AA (108% grafted) membranes of the substitutes and the steric effects of steric hindrance and strain affected the stability of alwere cut into a size of 3 1 1 cm and placed into the UV quartz cells facing to the UV light source. kene-Ag / complexes.…”

“…The equilibrium absorption membranes containing Ag / ion for facilitating olefin permeation. [7][8][9] In this work, we studied the was recorded after equilibrium. The coordination number (n), the formation coordination of silver ions with polyethylenegraft-poly(acrylic acid) (PE-g-AA) and the reequilibrium constant (K), and the association (k 1 ) and dissociation (k 2 ) constants of the PE-g-AAversible coordination of PE-g-AA-Ag / with olefin by spectrometric methods.…”

Development of new ionomer blend membranes, their characterization, and their application in the perstractive separation of alkenes from alkene-alkane mixtures. II. Electrical and facilitated transport properties

“…3 Several studies have been reported on the development of stable ion-exchange membranes for facilitated transport. [7][8][9] We previously reported the facilitated transport of olefins through newly developed sulfonated polysulfone (PSU) Udel membranes. 10 Good selectivity for olefin/paraffin separation was obtained, but low fluxes of the olefin through the membrane were observed.…”