Pervaporation of acetic acid aqueous solutions by organosilica membranes

Tsuru, Toshinori; Shibata, Toshinobu; Wang, Jinhui; Lee, Hye Ryeon; Kanezashi, Masakoto; Yoshioka, Tomohisa

doi:10.1016/j.memsci.2012.06.012

Cited by 57 publications

(36 citation statements)

References 33 publications

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“…BTESE membranes are resistant to aggressive aprotic solvents like N-methyl pyrrolidone (NMP), to organic acids like acetic acid [26,91] and even to HNO 3 up to concentrations of 0.05 wt% in water-ethanol (pH 2.2) [26]. Only substantially higher concentrations of HNO 3 or the use of even stronger acids like methyl sulfonic acid led to fast deterioration of the membrane, leading to complete loss of performance within several days [26,65].…”

Section: Stability Issuesmentioning

confidence: 99%

Structure–property tuning in hydrothermally stable sol–gel-processed hybrid organosilica molecular sieving membranes

Elshof

Dral

2015

J Sol-Gel Sci Technol

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Supported microporous organosilica membranes made from bridged silsesquioxane precursors by an acid-catalyzed sol-gel process have demonstrated a remarkable hydrothermal stability in pervaporation and gas separation processes, making them the first generation of ceramic molecular sieving membranes with sufficient performance under industrially relevant conditions. The commercial availability of various a,x-bis(trialkoxysilyl)alkane and 1,4-bis(trialkoxysilyl)benzene precursors facilitates the tailoring of membrane properties like pore size and surface chemistry via the choice of precursor(s) and process variables. Here, we describe the engineering of sols for making supported microporous thin films, discuss the thermal and hydrothermal stability of microporous organosilicas and give a short overview of the developments and applications of these membranes in liquid and gas separation processes since their first report in 2008.Graphical Abstract

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Section: Stability Issuesmentioning

confidence: 99%

Structure–property tuning in hydrothermally stable sol–gel-processed hybrid organosilica molecular sieving membranes

Elshof

Dral

2015

J Sol-Gel Sci Technol

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“…However, the separation factor in water/n-butanol pervaporation (α H2O/BuOH = 360-2700) was higher than that of BTESE-MTES, showing that besides the pore size, also other factors are important, e.g., pore connectivity and physicochemical interactions between permeating species and membrane matrix. BTESE membranes are resistant to aggressive aprotic solvents like N-methyl pyrrolidone (NMP), organic acids (Tsuru et al 2012;van Veen et al 2011), and HNO 3 up to concentrations of 0.05 wt% in water-ethanol (pH 2.2) . Higher concentrations of HNO 3 , or the use of stronger acids like methyl sulfonic acid, lead to fast deterioration of the membrane and complete loss of performance within a number of days (Castricum et al 2008a;van Veen et al 2011).…”

Section: Pervaporationmentioning

confidence: 99%

Hybrid Materials for Molecular Sieves

Elshof

2016

Handbook of Sol-Gel Science and Technology

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“…[14][15][16][17][18][19][20][21] For example, Asaeda et al developed SiO 2 -ZrO 2 membranes for the pervaporation of aqueous organic solutions such as ethanol, isopropanol, 1-propanol, acetone or tetrahydrofuran. These porous SiO 2 -ZrO 2 membranes, with a pore size less than 1 nm, were fabricated by an improved sol-gel technique on -Al 2 O 3 supports.…”

Section: Introductionmentioning

confidence: 99%

Control of Silica–Zirconia Nanoparticles for Uniform Porous SiO<SUB>2</SUB>–ZrO<SUB>2</SUB> Membranes

H¹,

J²,

B³

2014

j nanosci nanotechnol

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Silica-zirconia composite sols were prepared by means of a sol-gel method, using tetraethylorthosilicate (TEOS) and zirconium tetra-n-butoxide (ZrTB) precursors. TEOS, ZrTB, HCl, H2O and EtOH were mixed at 70 degrees C for 24 hours to give molar ratios of 1:1:8-80:0.2-1.0:100-300. The mean particle size of the silica-zirconia sol was controlled by the concentration of the alkoxides and catalyst, as well as the water molar ratio in the starting solution. The particle size of the SiO2-ZrO2 sol, which was analyzed by dynamic light scattering (DLS) and field emission scanning electron microscopy (FE-SEM), was in the range of 20 to 350 nm. The SiO2-ZrO2 sol solutions of different sol sizes were coated onto porous stainless steel supports (O.D. 10 mm, length: 20 mm, 316L SUS, Mott corp. USA) by a dipping-rolling-freezing-fast drying (DRFF) and soaking-rolling-freezing-fast drying (SRFF) method. After coating with SiO2-ZrO2 sol, the single gas permeation characteristics (He, H2 and N2) of the resulting SiO2-ZrO2 membranes were evaluated at room temperature. This produced a decrease in the mean flow diameter and H2/N2 permselectivity in the range of 2.0-3.5. Finally, following the results of gas permeation testing, the pore size of the membranes was controlled by changing their particle size.

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Pervaporation of acetic acid aqueous solutions by organosilica membranes

Cited by 57 publications

References 33 publications

Structure–property tuning in hydrothermally stable sol–gel-processed hybrid organosilica molecular sieving membranes

Structure–property tuning in hydrothermally stable sol–gel-processed hybrid organosilica molecular sieving membranes

Hybrid Materials for Molecular Sieves

Control of Silica–Zirconia Nanoparticles for Uniform Porous SiO<SUB>2</SUB>–ZrO<SUB>2</SUB> Membranes

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