CO2 Absorption in a Mini-module Membrane Contactor

Pantoleontos, G.; Kaldis, S.P.; Koutsonikolas, D.; Grammelis, Panagiotis; Sakellaropoulos, G.P.

doi:10.1007/978-1-4419-1017-2_18

Cited by 2 publications

(4 citation statements)

References 7 publications

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“…Still, water offers an elementary absorbing agent for removing CO 2 without necessitating the use of chemical solvents. Higher CO 2 removal values by absorption into water have also been reported reaching 76 %, and >95 % in a mini‐module membrane contactor, but at the expense of water consumption (liquid‐to‐gas flow rate ratio exceeds 30) …”

Section: Resultsmentioning

confidence: 97%

“…Membrane‐based gas absorption is gaining attention as an alternative to industrially well‐established gas separation equipment, such as packed columns, because of membrane modules' high mass transfer area (known a priori), modular design, easy scale‐up, and straightforward modelling of their flow behaviour . The main disadvantage of such equipment is the additional resistance to mass transfer imposed by the membrane when wetted by the liquid absorbent; any pore wetting considerably affects the efficiency of the process because of the slower diffusion of the gaseous species in the liquid phase than that in the gas phase .…”

Section: Introductionmentioning

confidence: 99%

“…In the past, experimental results of both reacting and non‐reacting solvents were presented for the efficient removal of CO 2 from the lumen side . In this study only physical absorption is considered for the modelling case in order to avoid the complexity of reacting fluids properties and possible heat transfer aspects (see e.g.…”

Section: Introductionmentioning

confidence: 99%

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Modelling, simulation, and membrane wetting estimation in gas‐liquid contacting processes

et al. 2017

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A set of experiments for CO 2 separation from CO 2 -N 2 mixture by absorption into water by means of a gas-liquid membrane contacting process is modelled using the mass continuity equation by combining process conditions, membrane and fluids properties, and module geometric characteristics. The general case of non-constant concentration of the diffusing component in the shell side (Case B) is used, which entails an integro-differential boundary condition at the lumen-wall. The computational method is compared with existing literature data in terms of the logarithmic averaged overall and lumen Sherwood numbers revalidating the superiority of the counter-current to the co-current mode of operation, while offering a theoretical prediction of the limited behaviour of the latter as a function of the equilibrium coefficient. The elaborate model is then applied in order to assess the extent of membrane wetting due to liquid penetration into the pores in terms of the resistance-in-series model by comparing with the experimental results derived in a commercial cross-flow membrane module under the counter-current mode of operation. It is revealed that the assumption of shell-side constant concentration (Case A) underestimates the wetting leading to a false estimation of the extent of liquid penetration into membrane pores. For Case B, a wetting-pattern appears showing a correlation of an increasing shell-side liquid flow rate with a decreasing wetting parameter and, thus, relatively less contribution of the liquid-filled membrane resistance to the overall membrane resistance with increasing liquid loading.

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Section: Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Modelling, simulation, and membrane wetting estimation in gas‐liquid contacting processes

et al. 2017

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“…CO 2 removal using membrane-based gas absorption and reaction is gaining attention as an alternative to well-established industrial gas-separation and reaction equipment, such as reactive-absorption columns, because of the high mass transfer area (known a priori ) of the membrane modules per unit volume, their modular design, and easy scale-up of the process. − A membrane bundle containing hundreds of fibers is placed within the membrane module with a customizable length, and it may provide a modular solution for easy lab- and pilot-testing with a specific surface area in the range of 1500–7000 m 2 /m 3 compared to 100–800 m 2 /m 3 for conventional devices …”

Section: Introductionmentioning

confidence: 99%

Modeling, Simulation, and Membrane Wetting Estimation in Gas–Liquid Contacting Processes Including Shell-Side Reaction: Biogas Upgrading Using DEA Solution

Pantoleontos,

Koutsonikolas,

Asimakopoulou

et al. 2024

Ind. Eng. Chem. Res.

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The basic principles of a steady-state mass transfer model and the resistance-in-series film model are assessed with the aid of a series of experiments in a gas–liquid contact membrane mini-module (3 M Liqui-Cel MM-1.7 × 5.5) using an aqueous solution of diethanolamine (DEA) of 0.25 M (mol/L) for biogas upgrading. Experimental data show that CO2 removal may exceed 67% and reach 100% in combination with the highest possible recovery of CH4 when employing biogas flow rates in the range of 2.8 × 10–5 – 3.6 × 10–5 m3/s and solvent flow rates within 0.47 × 10–5 – 0.58 × 10–5 m3/s. For the experimental data set, a correlation has been developed, effectively interpolating CO2 removal with the gas and liquid flow rates. The wetting values calculated are concentrated close to each other for the same liquid flow rate without considerably depending on the gas flow rate, especially when applying the Hikita–Yun (reaction rate–shell-side correlation) compared with the Hikita–Costello pair. Furthermore, the calculated wetting diminishes with increasing liquid flow rate, a result that is consistent with previous modeling attempts and relevant literature indications. The assumption of enhanced mass transfer in the liquid-filled part of the membrane pores due to the reaction is scrutinized, leading to objectionable computational wetting values. It is shown that for a concentration of DEA equal to 0.25 M the Hatta numbers and the enhancement factors are not equal in the whole reaction path; thus, the choice of the shell-side correlation has an appreciable impact on the overall analysis, especially for the determination of the wetting values.

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CO2 Absorption in a Mini-module Membrane Contactor

Cited by 2 publications

References 7 publications

Modelling, simulation, and membrane wetting estimation in gas‐liquid contacting processes

Modelling, simulation, and membrane wetting estimation in gas‐liquid contacting processes

Modeling, Simulation, and Membrane Wetting Estimation in Gas–Liquid Contacting Processes Including Shell-Side Reaction: Biogas Upgrading Using DEA Solution

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