Pushing membrane stability boundaries with HybSi® pervaporation membranes

Veen, H.M. van; Rietkerk, M.D.A.; Shanahan, D.P.; Tuel, M.M.A. van; Kreiter, Robert; Castricum, H.L.; Elshof, Johan E. ten; Vente, Jaap F.

doi:10.1016/j.memsci.2011.06.040

Cited by 88 publications

(79 citation statements)

References 29 publications

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“…To avoid a wide distribution of sizes in the sol, the hydrolysis is often carried out in two steps so that water-lean conditions are maintained throughout the process [24]. It is noted that in later studies hybrid organosilica membranes were mostly prepared from a single type of alkoxide precursor such as BTESE or bis(triethoxysilyl)methane (BTESM) [12,25,26], although condensation of monomers into relatively inert cyclic dimers that do not contribute to gel formation may have led to a decreased yield in these cases [22,27].…”

Section: Sol-gel Synthesismentioning

confidence: 99%

“…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%

“…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]. Despite the fact that hybrid organosilica membranes are much more Fig.…”

Section: Stability Issuesmentioning

confidence: 99%

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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: Sol-gel Synthesismentioning

confidence: 99%

Section: Stability Issuesmentioning

confidence: 99%

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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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“…The membrane support was anisotropic ceramic tube made of two types of alumina, outside α-Al 2 O 3 layer and thin inner layer of γ-Al 2 O 3 . The selective layer was an organic-inorganic hybrid and silica-based material, prepared by sol-gel process using bis-silyl precursors, such as bis(triethoxysilyl)ethane (BTESE) and bis(triethoxysilyl)methane (BTESM) (Veen et al, 2011). The selective layer of the membrane was located on the inner surface of the ceramic support, hence the feed mixture passed through the module through the lumen.…”

Section: Methodsmentioning

confidence: 99%

Pervaporation applied for dewatering of reaction mixture during esterification

Krasiński

Wierzba

Grudzień

et al. 2016

Chemical and Process Engineering

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In this work the esterification of diethyl tartrate was studied. The research was focused on the enhancement of reversible reaction yield, which is accomplished by dewatering of the reaction mixture. The removal of water shifts the equilibrium towards the main product. Pervaporation was applied for this purpose, and results were compared to distillation. The advantages and limitations of both processes are discussed. The experimental part consists of dewatering of mixture after the reaction had reached the equilibrium, and was subsequently fed to the test rig equipped with a single zeolite membrane purchased from Pervatech B.V. Results show a significant conversion increase as a result of water removal by pervaporation. Compared to distillation no addition of organics is necessary to efficiently remove water above the azeotrope. Nevertheless, some limitations and issues which call for optimisation are pointed out. A simple numerical model is proposed to support design and sizing of the pervaporation system. Various modes of integrated system operation are also briefly discussed.

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“…The C in pervaporation of 5 wt% water-95 wt% n-butanol. Selectivity is compared with methylated and inorganic silica membranes (Reproduced from Castricum et al (2008c) with permission from The Royal Society of Chemistry) development of these very stable hybrid (organo)silica membranes has led to renewed interest in molecular separations of gases and liquids under harsh conditions and to the release of a commercial product named HybSi ® (Agirre et al 2011;van Veen et al 2011). …”

Section: Historical Outline Of Microporous Ceramic Membrane Developmentmentioning

confidence: 99%