Effect of nanoparticles on oxygen absorption enhancement during sulfite forced oxidation

In this study, the mass transfer enhancement by nanoparticles during CO 2 absorption process with MDEA solution in a randomly packed tower was investigated. The mass transfer performance of MDEA solution with and without nanoparticles were quantified and analyzed in terms of the volumetric overall mass transfer coefficient (K G a v ). An enhancement factor (E), defined as the ratio of K G a v with and without nanoparticles, was further introduced to evaluate the enhancement effect of the addition of nanoparticles. The effects of TiO 2 nanoparticle concentration, MDEA concentration, liquid flow rate, liquid temperature, inert gas flow rate, and CO 2 loading on K G a v and E were systematically studied in the packed tower. It is found that the maximum value of E can reach 1.37, when the nanoparticle concentration is 0.09 wt %, the liquid flow rate is 21.22 m 3 /m 2 •h, the liquid temperature is 27°C, the MDEA concentration is 30%, the gas flow rate is 7.58 kmol/m 2 •h and the CO 2 loading is 0.2 mol CO 2 /mol MDEA. Usually, the K G a v of the MDEA nanofluids can be increased by 10-37% in a randomly packed tower compared to that of the MDEA solution, which is consistent with the results from the bubbling reactors. However, when the CO 2 loading of absorption exceeds 50%, E becomes less than 1.0, which means that high CO 2 loading inhibits the enhancement effect of nanoparticles. In order to predict the mass transfer performance of MDEA nanofluid, a formula correlating E and various dimensionless operating parameters (i.e. L, T , Ĉnf and ĈMDEA ) is proposed and fitted with an average absolute deviation of 14%.

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“…It confirms that nanoparticles are more agglomerated at higher temperatures. This is consistent with the results of other researchers 42,43 …”

Section: Resultssupporting

confidence: 94%

Enhancement of mass transfer performance by nanoparticles during the CO₂ absorption with MDEA solution in a randomly packed tower

et al. 2022

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“…To enhance the mass and heat transfer efficiency of the reactor and rate of promote the oxidative esterification reactions, it is necessary to use smaller catalyst particles and higher stirring rates are required for the reaction. [81] However, this can result in the production of easily crushed solid catalysts, which poses challenges in separating catalyst fines from the post-reaction system, making it difficult to achieve catalyst separation and reuse in the liquid-phase reaction system. [82] In recent years, significant progress has been made in the research on magnetic catalyst.…”

Section: Magnetic Catalystmentioning

confidence: 99%

Review on Performance and Preparation of Catalysts for Oxidative Esterification of Aldehydes or Alcohols to Esters

Zheng,

Huang,

et al. 2024

ChemCatChem

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Ester is an important chemical intermediate. Acids or acid derivatives are usually prepared by oxidation of aldehydes or alcohols, and then esters are prepared by esterification reaction, but the traditional process is complicated and energy consumption is very high. One‐step oxidative esterification of aldehydes and alcohols to esters is a simple, clean and efficient green synthesis method, which provides new opportunities for the efficient and low‐cost production of esters. For this promising and rapidly developing field, utilizing the latest research results on novel catalysts in recent years is highly desirable. Here, recent advances in the preparation of nonhomogeneous catalysts for the oxidative esterification of aldehydes or alcohols are summarized with a focus on both noble and non‐precious metal catalysts and their reaction mechanisms. Next, new catalytic strategies for future applications of the novel catalyst for this reaction are presented, discussing the advantages of single‐atom catalysts, hydrophobic catalysts, magnetic catalysts, and ionic liquid catalysts. Opportunities and challenges in this field are also highlighted.

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“…[21][22][23][24][25][26] The progressive effect of nanosized particles is utilized to overcome the scarcity of oxygen supply to the aqueous medium by enhancing the mass transfer coefficient and interfacial area for mass transfer. [27][28][29] In recent times, the development of innovative ideas in the field of nanotechnology has led to new advent, namely nanofluids. Nanofluids are the engineered colloidal suspension prepared by dispersing nano-sized particles into conventional liquids which act as base fluids.…”

Section: Introductionmentioning

confidence: 99%

“…Further, nanoparticles may be added into the liquid in biochemical reactors or gas-liquid contactors to enhance gas-liquid mass transfer. [26,27] In either case of the inherent presence or intentional addition of nanoparticles, the presence of these nanoparticles as nanofluids may influence the oxygen mass transfer characteristics of the reactor.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation, modelling, and order of magnitude analysis of oxygen mass transfer in pulsed plate column with α‐Fe₂O₃ nanofluid

Shet,

Shetty K.

2024

Can J Chem Eng

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Volumetric oxygen mass transfer coefficient (kLa) is an important parameter in the design of various reactors and bioreactors. In the present work, the influence of α‐Fe2O3 nanofluid on the enhancement of kLa is studied in a pulsed plate column (PPC). An enhancement factor of greater than one showed that the nanofluid is favourable in enhancing the mass transfer rate. The effect of pulsing velocity on kLa is observed to fall under two regimes: the dispersion regime and emulsion regime. The kLa enhancement factor is found to be higher in TiO2 nanofluid than in α‐Fe2O3 nanofluid, indicating that the type of nanofluid influences the enhancement factor. The order of magnitude analysis showed that localized convection triggered by the Brownian motion of nanoparticles is the phenomenon responsible for kLa enhancement. A dimensionless multiple regression analysis (MRA) model was developed to predict kLa in the nanoparticle loading range of 0.003–0.019 (v/v%), relating the Sherwood number with oscillating Reynolds number (1200 ≤ Reo ≤ 20,000), gas flow Reynolds number (0.135 ≤ Reg ≤0.370), Schmidt number (1300 ≤ Sc ≤2700), and Brownian Reynolds number (2.81 × 10−4 ≤ ReB ≤5 × 10−4). The pseudo‐homogeneous model could accurately predict the enhancement until critical loading conditions.

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Effect of nanoparticles on oxygen absorption enhancement during sulfite forced oxidation

Cited by 12 publications

References 33 publications

Enhancement of mass transfer performance by nanoparticles during the CO₂ absorption with MDEA solution in a randomly packed tower

Enhancement of mass transfer performance by nanoparticles during the CO₂ absorption with MDEA solution in a randomly packed tower

Review on Performance and Preparation of Catalysts for Oxidative Esterification of Aldehydes or Alcohols to Esters

Experimental investigation, modelling, and order of magnitude analysis of oxygen mass transfer in pulsed plate column with α‐Fe₂O₃ nanofluid

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Effect of nanoparticles on oxygen absorption enhancement during sulfite forced oxidation

Cited by 12 publications

References 33 publications

Enhancement of mass transfer performance by nanoparticles during the CO2 absorption with MDEA solution in a randomly packed tower

Enhancement of mass transfer performance by nanoparticles during the CO2 absorption with MDEA solution in a randomly packed tower

Review on Performance and Preparation of Catalysts for Oxidative Esterification of Aldehydes or Alcohols to Esters

Experimental investigation, modelling, and order of magnitude analysis of oxygen mass transfer in pulsed plate column with α‐Fe2O3 nanofluid

Contact Info

Product

Resources

About

Enhancement of mass transfer performance by nanoparticles during the CO₂ absorption with MDEA solution in a randomly packed tower

Enhancement of mass transfer performance by nanoparticles during the CO₂ absorption with MDEA solution in a randomly packed tower

Experimental investigation, modelling, and order of magnitude analysis of oxygen mass transfer in pulsed plate column with α‐Fe₂O₃ nanofluid