Correlation between Functional Group and Formation of Nanoparticles in PEBAX/Ag Salt/Al Salt Complexes for Olefin Separation

Abstract

poly ether-block-amide (PEBAX)-2533/metal salt/Al salt membranes were prepared for mixed olefin/paraffin separation. PEBAX-2533 with 80% ether group and 20% amide group was suggested as the polymer matrix for comparison of separation performance according to the functional group ratio in copolymer PEBAX. In addition, Al salts were used to stabilize metal ions for a long time as additives. High permeance was expected with the proportion of high ether groups, since these functional groups provided relatively permeable regions. As a result, the PEBAX-2533 composite membrane showed a selectivity of 5 (propylene/propane) with 10 GPU. However, the permeance of membrane was not unexpectedly improved and the selectivity was reduced. The result was analyzed by using SEM, RAMAN and thermogravimetric analysis (TGA), including Fourier transform infrared (FTIR). The reduction in separation performance was determined by using FT-IR. Based on these results, in order to stabilize the metal ions interacting with the polymer through Al(NO 3 ) 3 , it was concluded that a specific ratio of the amide group was needed in PEBAX as a polymer matrix.

Polyether Block Amide as Host Matrix for Nanocomposite Membranes Applied to Different Sensitive Fields

“…Filler combinations or functionalization are also examined for water treatment and humidification systems. [11] 2533 on a polysulfone (PSf) support AgBF4/Al(NO3)3 (1/0.1 mol/mol) 9.7 (AgBF4) Propylene/propane [12] 1657 on a PSf support AgBF4/Al(NO3)3 (1/0.1 mol/mol) 17 (AgBF4) Propylene/propane [13] 1657 on a PSf support Silver nanoparticle/7,7,8,8tetracyanoquinodimethane (AgNPs/TCNQ) 87 Propylene/propane [14] Figure 1. Categorization of Pebax-based nanocomposites on the basis of their application.…”

“…Table 2 summarizes the fillers dispersed into the MMMs for different separations with the adopted loading range, while Table 3 reports the filler types employed for applications not strictly related to separations on the molecular scale. [11] 2533 on a polysulfone (PSf) support AgBF 4 /Al(NO 3 ) 3 (1/0.1 mol/mol) 9.7 (AgBF 4 ) Propylene/propane [12] 1657 on a PSf support AgBF 4 /Al(NO 3 ) 3 (1/0.1 mol/mol) 17 (AgBF 4 ) Propylene/propane [13] 1657 on a PSf support Silver nanoparticle/7,7,8,8tetracyanoquinodimethane (AgNPs/TCNQ) 87 Propylene/propane [14] 5513 on a PSf support AgBF 4 /[BMIM][BF 4 ] 10 (AgBF 4 ) Propylene/propane [15] 2533 nano-zeolite (NaY or NaA) 3-10 Ethylene/propylene [16] 1657 Ionic Liquids (ILs) 20-60…”

Interactions of Ag Particles Stabilized by 7,7,8,8-Tetracyanoquinodimethane with Olefin Molecules in Poly(ether-block-amide)

“…Unfortunately, the relationship by performance varying PA/PE ratios of PEBAX groups has not been yet clear [20,21]. In this study, research was conducted using PEBAX-5513, which has a relatively larger proportion of PA groups (known to be more than 60%) compared with PEBAX-1657 (PE60% and PA40%) to understand the effect of segmenting PE and PA groups in the poly(ether-block-amide) resin.…”

Long-Term Stable 1-butyl-3-methylimidazolium Hexafluorophosphate/Ag Metal Composite Membranes for Facilitated Olefin Transport

“…Thus, the silver polymer electrolytes have been investigated as an alternative method in the distillation process, requiring high cost and space [ 2 , 4 ]. For example, the facilitated transport of propylene and ethylene through silver polymer electrolyte membranes consisting of AgBF 4 or AgCF 3 SO 3 dissolved in either poly(2-ethyl-2-oxazoline) (POZ), poly(N-vinyl pyrrolidone) (PVP) and poly(ethylene oxide) (PEO) showed the separation performance of 50 (propylene/propane) in selectivity and 12 GPU ((1 GPU = 1 × 10 −6 cm 3 (STP)/(cm 2 s cmHg)) in permeance [ 5 ]. However, since these metal ion-based systems could be poisoned by C 2 H 2 , CO, and H 2 S, silver ions were limited in application to the industry field [ 10 ].…”

“…Silver ions can be reversibly reacted with olefin molecules, forming a silver-olefin complex [1][2][3][4][5][6][7][8][9]. Thus, the silver polymer electrolytes have been investigated as an alternative method in the distillation process, requiring high cost and space [2,4].…”