All-silica DD3R zeolite membrane with hydrophilic-functionalized surface for efficient and highly-stable pervaporation dehydration of acetic acid

Zhang, Yuting; Qiu, Xufeng; Zhou, Hong; Du, Peng; Song, Qingnan; Gu, Xuehong

doi:10.1016/j.memsci.2019.03.061

Cited by 32 publications

(13 citation statements)

References 39 publications

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“…al, 45 which can prevent water attack by reducing the reactivity of silanol groups. A similar strategy has been applied on hydrophobic all‐silica DD3R membranes by enhancing the surface hydrophilicity, 58 showing good stability in the pervaporation dehydration of acidic solutions. Although the increase of stability may negatively impact the membrane flux, this strategy may provide future directions to enhance the stability of zeolite membranes for this dewatering application.…”

Section: Resultsmentioning

confidence: 99%

FAU zeolite membranes for dewatering of amine‐based post‐combustion CO₂ capture solutions

2020

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In amine-based CO 2 capture processes, aqueous amine solvent is circulated between absorber (CO 2 absorption) and stripping (solvent regeneration) columns. To reduce solvent regeneration energy demand, a selective membrane can dewater and enrich the CO 2 concentration in solution prior to the stripper, lowering steam requirements for solution heating. In this work, a facile synthesis strategy was developed to prepare faujasite (FAU) zeolite membranes built upon polydopamine (PDA) modified α-Al 2 O 3 substrates. PDA facilitated the attachment of zeolite phases onto the substrate surface to form a 3 μm membrane layer. Membrane permeation flux of 4.45 kg m −2 h −1 and 95% rejection rate calculated by either CO 2 loading or total alkalinity was achieved in dewatering of CO 2 loaded 30 wt% monoethanolamine (MEA) solution. The effects of temperature on membrane dewatering performance and stability were investigated. This study highlights the potential for process integration of membrane technology in amine-based post-combustion CO 2 capture operations.

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Section: Resultsmentioning

confidence: 99%

FAU zeolite membranes for dewatering of amine‐based post‐combustion CO₂ capture solutions

2020

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“…To date, the low stability of zeolites in acidic conditions has been identified as the main drawback of these materials for extending their application at large scales and to other separations. Therefore, scientists are hardly developing new strategies to provide enhanced acid-stability to zeolites; in addition to modifying the Si/Al ratio [ 39 ], the use of different precursors of zeolite synthesis [ 44 ], impregnation [ 40 ], and grafting of chemical agents [ 50 ] are among the alternative protocols to confer enhanced stability in zeolites. To some extent, it is likely that researchers will be continuously developing new chemical modification techniques of zeolites; however, the performance assessment of zeolites membranes in a long-term operation may be required.…”

Section: Discussionmentioning

confidence: 99%

“…Zhang et al [ 50 ] used 3-aminopropyltriethoxysilane (APTES) to graft the surface of hollow fiber supported deca-dodecasil 3-rhombohedral (DD3R) membrane (see Figure 3 a), aiming at the improvement of its surface hydrophilicity and stability in acidic pervaporation. By a combined effect of facilitated water adsorption on the surface and an intrinsic molecular-sieving mechanism of DD3R zeolitic pores, the APTES-DD3R membranes released an enhanced β of 1700, a higher value than 196 in the pure DD3R membrane when separating 10 wt.% water/acetic acid mixture (at 75 °C).…”

Section: Latest Insights Into Zeolite-based Membranes For Pervapormentioning

confidence: 99%

Pervaporation Zeolite-Based Composite Membranes for Solvent Separations

Castro-Muñoz

Boczkaj

2021

Molecules

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Thanks to their well-defined molecular sieving and stability, zeolites have been proposed in selective membrane separations, such as gas separation and pervaporation. For instance, the incorporation of zeolites into polymer phases to generate composite (or mixed matrix) membranes revealed important advances in pervaporation. Therefore, the goal of this review is to compile and elucidate the latest advances (over the last 2-3 years) of zeolite applications in pervaporation membranes either combining zeolites or polymers. Here, particular emphasis has been focused on relevant insights and findings in using zeolites in pervaporative azeotropic separations and specific aided applications, together with novel concepts of membranes. A brief background of the pervaporation process is also given. According to the findings of this review, we provide future perspectives and recommendations for new researchers in the field.

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“…Indeed, the total flux was increased by more than twice of that of the previous study. Moreover, the performances of the developed membranes seem to be higher than conventional polymeric membranes [29][30][31] and are becoming closer to those of conventional inorganic membranes [9,12,14,20,[32][33][34][35], including zeolite membranes [9,12,14,20,34,35], which are expected to be promising candidate membranes for separating CH 3 COOH/water mixtures. [26]; the cross marks indicate performances of conventional polymeric membranes reported in references [29][30][31]; the triangle marks indicate performances of conventional inorganic membranes reported in references [32,33]; the diamond marks indicate the conventional zeolite membranes reported in reference [9,12,14,20,34,35].…”

Section: Effect Of Seeding On Tubular Substratesmentioning

confidence: 95%

“…Both water and CH3COOH permeance decreased by about 20% from the first test to the second test; however, the permeance was still high compared to our previous report [26] and maintained nearly constant thereafter for more than 300 h. This indicated that the h-WO3 membrane is durable against acidic solvents and that its performance can be maintained even during a long-term-separation test. [26]; the cross marks indicate performances of conventional polymeric membranes reported in references [29][30][31]; the triangle marks indicate performances of conventional inorganic membranes reported in references [32,33]; the diamond marks indicate the conventional zeolite membranes reported in reference [9,12,14,20,34,35]. )…”

Section: Pv Performancementioning

confidence: 99%

Synthesis of C-Plane Oriented Hexagonal Tungsten Oxide Membranes on Tubular Substrates and Their Acetic Acid/Water Separation Performances

et al. 2021

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Hexagonal tungsten oxide (h-WO3) membrane is a novel candidate for dehydration of acetic acid (CH3COOH)/water mixtures owing to its molecular sieving property and acidic resistance. Meanwhile, c-plane orientation is an important factor for h-WO3 membranes because the pores of h-WO3 run along its c-axis. However, so far, high c-plane orientation has not been successful on tubular substrates. Here, the effect of synthesis conditions of h-WO3 membranes on tubular substrates against c-plane orientation and CH3COOH/water separation performance are investigated. The h-WO3 membranes were prepared by hydrothermal synthesis from a precursor sol containing various amounts of sodium tungstate (Na2WO4) in the presence of tubular substrates with seeds embedded on their outside surface. The seeding method and the amount of Na2WO4 in the precursor sol significantly affected both crystal orientation and densification of the membrane. A precursor sol with appropriate amounts of Na2WO4 was essential to simultaneously satisfy high c-plane orientation and densification of the membrane while excess Na2WO4 drastically decreased the degree of c-plane orientation. A highly c-plane oriented h-WO3 membrane was successfully obtained under the optimized condition, which exhibited a maximum separation factor of 40.0 and a water permeance of 1.53 × 10−7 mol·m−2·s−1·Pa−1 in a 90:10 wt % CH3COOH/water mixture. The water permeance approximately doubled compared to the previous report, possibly owing to the significantly higher degree of c-plane orientation. Furthermore, it was found that its separation ability can be maintained while stored in 90:10 wt % CH3COOH/water mixture with pH < 0 for more than 500 h.

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All-silica DD3R zeolite membrane with hydrophilic-functionalized surface for efficient and highly-stable pervaporation dehydration of acetic acid

Cited by 32 publications

References 39 publications

FAU zeolite membranes for dewatering of amine‐based post‐combustion CO₂ capture solutions

FAU zeolite membranes for dewatering of amine‐based post‐combustion CO₂ capture solutions

Pervaporation Zeolite-Based Composite Membranes for Solvent Separations

Synthesis of C-Plane Oriented Hexagonal Tungsten Oxide Membranes on Tubular Substrates and Their Acetic Acid/Water Separation Performances

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All-silica DD3R zeolite membrane with hydrophilic-functionalized surface for efficient and highly-stable pervaporation dehydration of acetic acid

Cited by 32 publications

References 39 publications

FAU zeolite membranes for dewatering of amine‐based post‐combustion CO2 capture solutions

FAU zeolite membranes for dewatering of amine‐based post‐combustion CO2 capture solutions

Pervaporation Zeolite-Based Composite Membranes for Solvent Separations

Synthesis of C-Plane Oriented Hexagonal Tungsten Oxide Membranes on Tubular Substrates and Their Acetic Acid/Water Separation Performances

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FAU zeolite membranes for dewatering of amine‐based post‐combustion CO₂ capture solutions

FAU zeolite membranes for dewatering of amine‐based post‐combustion CO₂ capture solutions