The effect of dydrophobic modification of zelites on CO2 absorption in different solvents

Lu, Sumin; Ma, Youguang; Shen, Shuhua; Zhu, Chunying

doi:10.1590/s0104-66322010000200011

Cited by 12 publications

(5 citation statements)

References 22 publications

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“…Liquid-Liquid mass transfer coefficients o Carbon dioxide mass transfer coefficient The rate of carbon dioxide removal in HFMD depends on membrane area, pore size, and pore material. It was found that membrane fibres with small pores and hydrophobic construction are better suited for carbon dioxide absorption (Sumin et al, 2010). All three cartridges, Braun Low Flux, Braun High Flux, and Leoceed21N, comprise of a polysulfone membrane, which has a hydrophobic nature (Espinoza-Gómez & Lin, 2003).…”

Section: Resultsmentioning

confidence: 99%

The use of hollow fibre membrane dialysers in a liquid-liquid configuration for respiratory support

Minnie¹,

Gibson²,

Stacey³

2022

Medical Devices Innovation for Africa: Enabling Industrialisation

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Conventional extracorporeal membrane oxygenation utilises a gas-to-liquid transfer regime to oxygenate blood from a stream of oxygen gas. This work serves as an exploratory study of the liquid-to-liquid transfer of dissolved gases, which may prove advantageous for general applications of ECMO as it allows for higher partial pressures of oxygen as well as the use of isotonic solutions as a means of improving patient haemostability. This concept is of particular interest to an ongoing project which has investigated the use of repurposed hollow fibre membrane dialysers as a means of providing emergency respiratory support using existing equipment. The liquid-liquid regime mass transfer properties of the hollow fibre membrane dialysers were investigated by determining the mass transfer coefficients of carbon dioxide and salt through the membrane as well as the sieving coefficient and leakage rate. Three cartridge types (high flux Braun, low flux Braun and Leoceed 21N) were investigated using a liquid-liquid configuration with carbonated or saline water used as a blood substitute in contact with distilled water. The high flux cartridge demonstrated a high leakage rate making it unsuitable for the proposed use. The two low flux cartridges demonstrated adequate carbon dioxide removal of 75.8% and 64.4% of the recommended 200ml/min for the Braun and Leoceed cartridges, respectively. All three cartridges displayed sieving coefficients close to one, indicating a high rate of salt transfer and subsequent need for solute balance in the final application. The results of this work showed a higher mass transfer coefficient for the liquid-liquid transfer regime compared to prior studies using a gas-liquid transfer regime. This result suggests that a liquid-liquid configuration is not just useful for emergency respiratory support but could outperform existing ECMO techniques. Further study into the use of liquid-liquid HFMD for respiratory support, using blood and conditions more representative of the final intended use, is warranted.

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Section: Resultsmentioning

confidence: 99%

The use of hollow fibre membrane dialysers in a liquid-liquid configuration for respiratory support

Minnie¹,

Gibson²,

Stacey³

2022

Medical Devices Innovation for Africa: Enabling Industrialisation

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“…Based on Higbie's penetration model, the mass balance formula for the solute in three dimensions around the nanoparticle can be obtained as follows:

J_{x} = - D_{C} \frac{\partial C_{A}}{\partial x} dydz

J_{x + dx} = J_{x} + \frac{\partial J_{x}}{\partial x} dx

J_{+} = \frac{\partial C_{A}}{\partial t} dxdydz

J_{-} = r_{A} + R_{d} dxdydz

R_{d} = k_{p} a_{p} (C_{AD} - C_{AS})

a_{p} = \frac{6 m_{s}}{d_{p} ρ_{p}}

Due to the weak chemical reaction of carbon dioxide with water, CO 2 absorption in the water can be considered a physical absorption; thus, in this study, r A = 0. [ 40 ] As a result, the mass balance in the x , y , and z directions should be written as follows:

J_{x} = J_{x + dx} + J_{+} + J_{-}

D_{C} (\partial^{2} C<...)

…”

Section: Theoretical Modelmentioning

confidence: 99%

“…Due to the weak chemical reaction of carbon dioxide with water, CO 2 absorption in the water can be considered a physical absorption; thus, in this study, r A = 0. [40] As a result, the mass balance in the x, y, and z directions should be written as follows:…”

Section: Mass Balancementioning

confidence: 99%

Theoretical and experimental investigation of CO₂ solubility in nanofluids containing NaP zeolite nanocrystals and [C₁₂mim][Cl] ionic liquid

et al. 2022

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Today, CO2 separation is very important, both as an environmental issue and also in various industries. In this study, the water‐based nanofluid of NaP zeolite nanocrystals and 1‐dodecyl‐3‐methylimidazolium chloride ([C12mim][Cl]) ionic liquid were mixed and tested experimentally for CO2 absorption in an isothermal high pressure cell equipped with magnetic stirring. Zeolite nanocrystals were synthesized via the hydrothermal approach and characterized. A series of experiments were performed at different conditions to investigate the impact of various parameters, including nanoparticle type, nanoparticle concentration, stabilizer concentration, and the vessel's initial pressure, on CO2 solubility. It was found that 0.02 wt.% of zeolite nanoparticles, 0.4 wt.% of [C12mim][Cl] ionic liquid, and 0.05 wt.% of sodium dodecyl benzene sulphonate (SDBS) in nanofluids result in higher absorption of CO2 compared to other concentrations. Furthermore, CO2 absorption was increased by increasing ionic liquid and surfactant concentration up to a certain value near critical micelle concentration, but after that the CO2 absorption was decreased. The overall CO2 absorption enhancement at 20 bar for 0.02 wt.% zeolite and ZnO water‐based nanofluids with 0.4% [C12mim][Cl] ionic liquid and 0.02 wt.% SDBS were 26.9%, 21.5%, 21.2%, and 17% in comparison to pure water, respectively. In an absorption process using nanofluids, besides the influence of the mentioned parameters, the micro‐convection caused by Brownian motion and the grazing effect of nanoparticles should be noted. Considering the micro‐convection and grazing effects, a theoretical model should take into account the Brownian motion and grazing effects on the mass transfer rate in nanofluids to investigate the absorption enhancement by nano‐particles.

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“…Tabel 1 menunjukkan, senyawa silika (SiO2) dengan perlakuan asam (HCl) berada dikisaran 75-76% sedangkan dengan perlakuan basa (NaOH) berada dikisaran 72-73%. Proses perlakuan asam pada zeolit alam menyebabkan terjadinya (Sumin, et al, 2009). Sedangkan aktivasi dengan basa menggunakan larutan NaOH, penurunan rasio Si/Al akan terjadi pada aktivasi dengan pH tinggi.…”

Section: Hasil Dan Pembahasan Hasil Pengujian Xrdunclassified

“…Aktivasi secara kimia dengan perlakuan asam bertujuan agar terjadi proses dealuminasi sehingga daya adsorpsi zeolit terhadap air berkurang karena bersifat hidrofobik (Sumin,et al, 2009). Dealuminasi dan dekationisasi ini terjadi karena HCl bereaksi dengan alumina membentuk AlCl3 dan MCln.…”

Section: Hasil Dan Pembahasan Hasil Pengujian Xrdunclassified

Pengaruh Aktivasi secara Kimia menggunakan Larutan Asam dan Basa terhadap Karakteristik Zeolit Alam

Muttaqii¹,

Birawidha²,

Isnugroho³

et al. 2019

j.res.technol.ind.

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Zeolit alam merupakan batuan mineral yang banyak terdapat di Indonesia. Zeolit alam merupakan kristal alumino silikat yang memiliki banyak kegunaan dalam bidang industri, agrikultura, dan pengolahan air limbah. Salah satu proses untuk meningkatkan kualitas dari zeolit alam adalah melalui proses aktivasi. Tujuan penelitian ini adalah melihat pengaruh aktivasi secara kimia menggunakan larutan asam klorida dan natrium hidroksida sehingga mampu meningkatkan aktivitas dari zeolit alam tersebut. Aktivasi zeolit alam dilakukan secara kimia dengan menggunakan larutan HCl dan NaOH pada variasi konsentrasi 0.5, 1, 1.5, 2, 2.5 M. Selanjutnya zeolit tersebut dianalisa menggunakan XRD dan XRF. Hasil XRD menunjukkan fase utama dari zeolit alam adalah mordenite. Sedangkan hasil XRF menunjukkan senyawa silika (SiO2) dengan perlakuan asam (HCl) berada dikisaran 75-76% sedangkan dengan perlakuan basa (NaOH) berada dikisaran 72-73%. Proses perlakuan asam pada zeolit alam menyebabkan terjadinya penurunan kandungan Ca dan Mg pada zeolit.

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The effect of dydrophobic modification of zelites on CO2 absorption in different solvents

Cited by 12 publications

References 22 publications

The use of hollow fibre membrane dialysers in a liquid-liquid configuration for respiratory support

The use of hollow fibre membrane dialysers in a liquid-liquid configuration for respiratory support

Theoretical and experimental investigation of CO₂ solubility in nanofluids containing NaP zeolite nanocrystals and [C₁₂mim][Cl] ionic liquid

Pengaruh Aktivasi secara Kimia menggunakan Larutan Asam dan Basa terhadap Karakteristik Zeolit Alam

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The effect of dydrophobic modification of zelites on CO2 absorption in different solvents

Cited by 12 publications

References 22 publications

The use of hollow fibre membrane dialysers in a liquid-liquid configuration for respiratory support

The use of hollow fibre membrane dialysers in a liquid-liquid configuration for respiratory support

Theoretical and experimental investigation of CO2 solubility in nanofluids containing NaP zeolite nanocrystals and [C12mim][Cl] ionic liquid

Pengaruh Aktivasi secara Kimia menggunakan Larutan Asam dan Basa terhadap Karakteristik Zeolit Alam

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Theoretical and experimental investigation of CO₂ solubility in nanofluids containing NaP zeolite nanocrystals and [C₁₂mim][Cl] ionic liquid