Membrane Stripping Technology for CO2 Desorption from CO2-rich Absorbents with Low Energy Consumption

Wang, Zhen; Ma, Qinhui; Zhao, Zhifang; Wang, Tao; Luo, Zhongyang

doi:10.1016/j.egypro.2014.11.085

Cited by 29 publications

(25 citation statements)

References 17 publications

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“…Part of the difference seems to arise from the experimental configuration: limiting the experiments to only the stripping stage allows the optimization of the operating conditions for effective and energy efficient desorption, while the operation in the continuous absorption-stripping mode requires also the consideration of the absorption performance when setting the operating parameters, such as the liquid flow rate. Compared to the work of Wang et al [43], the liquid flow rate is higher in our case, leading to higher sensible heat requirement for heating the solvent. However, the major difference is the much higher desorption efficiency of the membrane contactor stripping unit demonstrated by Wang et al [43],…”

Section: Figurecontrasting

confidence: 70%

“…Compared to the work of Wang et al [43], the liquid flow rate is higher in our case, leading to higher sensible heat requirement for heating the solvent. However, the major difference is the much higher desorption efficiency of the membrane contactor stripping unit demonstrated by Wang et al [43],…”

Section: Figurecontrasting

confidence: 70%

“…Two types of approaches can be identified in the referenced works. In the first approach, the experiments and calculations are limited to the stripping stage in various configurations, and absorption and solvent circulation are not included [41,42,43]. Here, the energy consumption values range from 200 to 780 kJ kg CO2 -1 .…”

Section: Figurementioning

confidence: 99%

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Insights into a membrane contactor based demonstration unit for CO2 capture

Nieminen

Järvinen

Ruuskanen

et al. 2020

Separation and Purification Technology

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A continuously operated CO2 capture unit, based on absorption in a membrane contactor and lowtemperature vacuum desorption, is demonstrated. The major advantage of membrane contactors is their high specific interfacial area per unit volume. The unit is designed to be modular to allow different absorption membrane modules and stripping units to be tested, with the aim of capturing CO2 from simulated flue gases at concentrations down to the ambient concentration. In addition, desorption can be performed under vacuum to improve the desorption efficiency. The experimental unit incorporates comprehensive measurements and a high level of automation, with heat integration and continuous measurement of electricity consumption providing real-time estimates of the energy consumed in the capture process.In preliminary tests, the results of which are described herein, a 3M Liqui-Cel™ polypropylene hollow-fiber membrane module and a glass vacuum chamber were used for absorption and desorption, respectively, along with a potassium glycinate amino acid salt absorbent solution. This solution has high surface tension and is fully compatible with the polypropylene membrane unit used. In preliminary tests, the highest observed CO2 flux was 0.82 mol m -2 h -1 , with a CO2 product purity of above 80%. The calculated overall mass transfer coefficient was comparable to reference systems. The performance of the unit in its current setup was found to be limited by the desorption efficiency. Due to the low desorption rates, the measured specific energy consumption was exceedingly high, at 4.6 MJ/mol CO2 (29.0 MWh/t) and 0.8 MJ/mol CO2 (5.0 MWh/t) of heat and electricity, respectively. Higher desorption temperatures and lower vacuum pressures enhanced the desorption efficiency and reduced the specific energy consumption. The energy efficiency could be improved via several methods in the future, e.g., by applying ultrasound radiation or by replacing the current vacuum chamber stripping unit with a membrane module or some other type of desorption unit.

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Section: Figurecontrasting

confidence: 70%

Section: Figurecontrasting

confidence: 70%

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Insights into a membrane contactor based demonstration unit for CO2 capture

Nieminen

Järvinen

Ruuskanen

et al. 2020

Separation and Purification Technology

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“…Liquid inlet pressure is commonly used to estimate the wettability of an absorbent liquid on a membrane [125]. Methods for reducing membrane wettability include using hydrophobic membranes, a dense surface layer composite membrane, selecting high surface tension liquids, and operating at a pressure lower than the liquid inlet pressure [126]. Saeed et al [104] in their research improve the water affinity and mechanical properties of PVAm membranes to enhance CO 2 separation at pressures that are moderately high.…”

Section: Effect Of Water Vapour On the Membrane Performancementioning

confidence: 99%

Advances in the Use of Nanocomposite Membranes for Carbon Capture Operations

Okoro

Josephs

Sanni

et al. 2021

International Journal of Chemical Engineering

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The adoption of nanodoped membranes in the areas of gas stream separation, water, and wastewater treatments due to the physical and operational advantages of such membranes has significantly increased. The literature has shown that the surface structure and physicochemical properties of nanodoped membranes contribute significantly to the interaction and rejection characteristics when compared to bare membranes. This study reviews the recent developments on nanodoped membranes, and their hybrids for carbon capture and gas separation operations. Features such as the nanoparticles/materials and hybrids used for membrane doping and the effect of physicochemical properties and water vapour in nanodoped membrane performance for carbon capture are discussed. The highlights of this review show that nanodoped membrane is a facile modification technique which improves the membrane performance in most cases and holds a great potential for carbon capture. Membrane module design and material, thickness, structure, and configuration were identified as key factors that contribute directly, to nanodoped membrane performance. This study also affirms that the three core parameters satisfied before turning a microporous material into a membrane are as follows: high permeability and selectivity, ease of fabrication, and robust structure. From the findings, it is also observed that the application of smart models and knowledge-based systems have not been extensively studied in nanoparticle-/material-doped membranes. More studies are encouraged because technical improvements are needed in order to achieve high performance of carbon capture using nanodoped membranes, as well as improving their durability, permeability, and selectivity of the membrane.

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“…When the decreasing of regeneration pressure, overall equivalent work for CO 2 membrane stripping decreases to a minimum value, being this variable subject to optimization. Compared with conventional thermal regeneration, up to 30% of energy consumption can be reduced for CO 2 membrane vacuum stripping, as estimated by Wang et al [55].…”

Section: Absorption-desorption Processmentioning

confidence: 99%

CO2 Desorption Performance from Imidazolium Ionic Liquids by Membrane Vacuum Regeneration Technology

et al. 2020

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In this work, the membrane vacuum regeneration (MVR) process was considered as a promising technology for solvent regeneration in post-combustion CO2 capture and utilization (CCU) since high purity CO2 is needed for a technical valorization approach. First, a desorption test by MVR using polypropylene hollow fiber membrane contactor (PP-HFMC) was carried out in order to evaluate the behavior of physical and physico-chemical absorbents in terms of CO2 solubility and regeneration efficiency. The ionic liquid 1-ethyl-3-methylimidazolium acetate, [emim][Ac], was presented as a suitable alternative to conventional amine-based absorbents. Then, a rigorous two-dimensional mathematical model of the MVR process in a HFMC was developed based on a pseudo-steady-state to understand the influence of the solvent regeneration process in the absorption–desorption process. CO2 absorption–desorption experiments in PP-HFMC at different operating conditions for desorption, varying vacuum pressure and temperature, were used for model validation. Results showed that MVR efficiency increased from 3% at room temperature and 500 mbar to 95% at 310K and 40 mbar vacuum. Moreover, model deviation studies were carried out using sensitivity analysis of Henry’s constant and pre-exponential factor of chemical interaction, thus as to contribute to the knowledge in further works.

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Membrane Stripping Technology for CO2 Desorption from CO2-rich Absorbents with Low Energy Consumption

Cited by 29 publications

References 17 publications

Insights into a membrane contactor based demonstration unit for CO2 capture

Insights into a membrane contactor based demonstration unit for CO2 capture

Advances in the Use of Nanocomposite Membranes for Carbon Capture Operations

CO2 Desorption Performance from Imidazolium Ionic Liquids by Membrane Vacuum Regeneration Technology

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