Carbon dioxide absorption with aqueous amine solutions promoted by piperazine and 1-methylpiperazine in a rotating zigzag bed

Liu, Zhibang; Esmaeili, Arash; Zhang, Hanxiao; Xin, Hao; Yun, Jimmy; Shao, Lei

doi:10.1016/j.fuel.2021.121165

Cited by 17 publications

(17 citation statements)

References 63 publications

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“…On the basis of our previous study, the experimental K G a in RZB was calculated by the following equation where G ′ is the inlet flow rate of inert gas, P is the overall pressure of the gas phase, H is the axial depth of the RZB rotor, r o and r i are the outer and inner radii of the RZB rotor, respectively, and y CO 2 ‑in and y CO 2 ‑out are the CO 2 molar fraction in the gas phase at the gas inlet and outlet, respectively.…”

Section: Methodsmentioning

confidence: 99%

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Carbon Dioxide Absorption with an Aqueous Biphasic Absorbent in a Rotating Zigzag Bed

et al. 2022

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This study explored an intensive carbon dioxide (CO2) absorption process with aqueous biphasic absorbents containing diethylethanolamine (DEEA) and diethylenetriamine (DETA) in a rotating zigzag bed (RZB). The effects of the absorbent composition on the phase separation behavior and CO2 absorption performance were investigated. The dependence of the overall gas-phase volumetric mass transfer coefficient (K G a) and CO2 absorption efficiency on operating conditions with the DEEA + DETA solution was examined. Experimental results indicated that over 97% absorbed CO2 was focused on the bottom layer in the rich solution. The 4 mol/L DEEA + 1 mol/L DETA and 3.5 mol/L DEEA + 1.5 mol/L DETA solutions had much less volume of the bottom layer compared to absorbents with other compositions. Moreover, it was found that the lean solution flow rate, rotational speed of RZB, and temperature of lean solution had a positive influence on CO2 absorption. The K G a and CO2 absorption efficiency in the RZB with the 3.5 mol/L DEEA + 1.5 mol/L DETA solution reached 4.82 kmol/kPa m3 h and 98.7%, respectively, demonstrating an obvious advantage in CO2 absorption performance compared to the 5 mol/L monoethanolamine solution. An artificial neural network (ANN) model was established to predict K G a and CO2 absorption efficiency. The predicted data and experimental results were in good agreement with the deviations generally less than 10% for K G a and CO2 absorption efficiency. A comparison with a wetted-wall column revealed that the RZB could achieve higher mass transfer efficiency. In addition, the mechanism of phase separation in the DEEA + DETA solution was analyzed. This study demonstrates that the DEEA + DETA solution could be a viable absorbent for CO2 capture in RZB.

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Section: Methodsmentioning

confidence: 99%

“…Also, a multistage operation can be expediently achieved compared to RPB . An RZB was used to absorb CO 2 with a DETA-based solution, and the results indicated that RZB is an efficient device in CO 2 absorption with less consumption of the absorbent and smaller size of the device compared to RPB …”

Section: Introductionmentioning

confidence: 99%

Carbon Dioxide Absorption with an Aqueous Biphasic Absorbent in a Rotating Zigzag Bed

et al. 2022

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“…r G can be calculated from eq 2, 24 where (K G a e ) CO 2 and (K G a e ) SO 2 can be expressed as eqs 3 and 4, respectively. 3 Ha can be calculated using eq 5, where the local liquid-side mass transfer coefficient (k L ) was obtained with the 0.05 mol•L −1 NaOH−2% CO 2 system. 21 i k j j j j j j y (3)…”

Section: Calculation Of Keymentioning

confidence: 99%

Study on the Effective Mass Transfer Area and the Local Gas-Side Mass Transfer Coefficient in a Rotor–Stator Reactor

Xin

Wang

Liu

et al. 2022

Ind. Eng. Chem. Res.

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To increase the applicability of a rotor−stator reactor (RSR) in gas−liquid mass transfer processes, the effective mass transfer area (a e ) and the local gas-side mass transfer coefficient (k G ) in the RSR were measured by employing a NaOH solution to absorb CO 2 and SO 2 , where gas radial velocity is required to be large enough to ignore the gas-side mass transfer resistance in determination of a e . The effects of operating conditions and stator rings on these mass transfer parameters were investigated. The experimental results showed that a e and k G in the RSR with stator rings were higher than those in the RSR without stator rings by 17−30 and 1−9%, respectively. a e in the RSR with stator rings was 3.4% lower than that in a rotating packed bed, but k G in such RSR was higher than that in the rotating packed bed by 78.6%, suggesting that the RSR has great potential for industrial applications in the processes controlled by gas-side mass transfer.

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“…Sheng et al [4] and Liu et al [46] exhibited the relationship between the overall volumetric mass transfer coefficient and the inlet and outlet concentrations of CO2 in RPB, and the estimation of KG using the measured inlet CO2 concentration and the calculated outlet CO2 concentration by the model in different operating conditions can be performed by the following equation.…”

Section: Experimental Work Reviewmentioning

confidence: 99%

Modeling of carbon dioxide absorption by solution of piperazine and methyldiethanolamine in a rotating packed bed

Esmaeili

Tamuzi

Borhani

et al. 2022

Chemical Engineering Science

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Carbon dioxide absorption with aqueous amine solutions promoted by piperazine and 1-methylpiperazine in a rotating zigzag bed

Cited by 17 publications

References 63 publications

Carbon Dioxide Absorption with an Aqueous Biphasic Absorbent in a Rotating Zigzag Bed

Carbon Dioxide Absorption with an Aqueous Biphasic Absorbent in a Rotating Zigzag Bed

Study on the Effective Mass Transfer Area and the Local Gas-Side Mass Transfer Coefficient in a Rotor–Stator Reactor

Modeling of carbon dioxide absorption by solution of piperazine and methyldiethanolamine in a rotating packed bed

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