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Carbon Dioxide Capture Using Aqueous MEA Solutions in a Countercurrent Adiabatic Packed-bed Absorber

Banerjee, Sudesna (2020) Carbon Dioxide Capture Using Aqueous MEA Solutions in a Countercurrent Adiabatic Packed-bed Absorber. Master's Thesis, University of Pittsburgh. (Unpublished)

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Abstract

A 5-components mathematical model was developed in Matlab (R2016a) for CO2
absorption from a gas mixture using aqueous MEA solutions in a countercurrent adiabatic packedbed
absorber based on the gas absorption with chemical reaction method developed by Pandya [1].
The absorber was operated under conditions similar to CO2 capture in post-combustion
applications. The model equations were derived, and their parameters were obtained from the
literature. The Henry’s Law constant (He) and CO2 diffusivity in the aqueous MEA solutions were
calculated using the N2O analogy. Also, a rate-based model for the system in the same absorber
was developed in Aspen Plus (v.8.8). Both models were used to predict the experimental results
of CO2 capture from a gas mixture using aqueous MEA solutions in a 0.10 m ID, 6.55 m height
packed-bed absorber with 12.7 mm Berl Saddles reported by Tontiwachwuthikul et al. [2]. The
experimental results include CO2 mole fraction, CO2 loading and liquid-phase temperature profiles
for four different runs.
The Matlab model predictions indicated that under all operating conditions used, the
reactions between CO2 and aqueous MEA were fast as enhancement factors greater than 10 were
calculated, and consequently the overall mass transfer rates were dependent on the specific wetted
gas-liquid interfacial areas (aw) and independent of the liquid-side mass transfer coefficients (kL).
In the Matlab model, the correlations by Cho [3] were used to calculate the specific wetted area
(aw) and the liquid-side mass transfer coefficient (kL); and the model predictions were in a good
v
agreement with the experimental data. In the Aspen Plus model, the correlations by Billet and
Schultes [4] were used to calculate (aw) and the liquid-side mass transfer coefficient (kL); and the
model could not satisfactorily predict the experimental data. The reason for this behavior was
attributed to the small aw values calculated using the correlations by these authors when compared
with those using the correlations by Cho [3]. Therefore, an interfacial area correction factor was
introduced into the Aspen Plus model; and as a result, a good agreement was possible between the
corrected model predictions and the experimental data.


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Details

Item Type: University of Pittsburgh ETD
Status: Unpublished
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Banerjee, Sudesnasub66@pitt.edusub66
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairMorsi, Badiemorsi@pitt.edumorsi
Committee MemberKlinzing, Georgeklinzing@pitt.eduklinzing
Committee MemberBaled, Hseenhob9@pitt.eduhob9
Date: 29 July 2020
Date Type: Publication
Defense Date: 6 April 2020
Approval Date: 29 July 2020
Submission Date: 6 April 2020
Access Restriction: 2 year -- Restrict access to University of Pittsburgh for a period of 2 years.
Number of Pages: 141
Institution: University of Pittsburgh
Schools and Programs: Swanson School of Engineering > Chemical and Petroleum Engineering
Degree: MS - Master of Science
Thesis Type: Master's Thesis
Refereed: Yes
Uncontrolled Keywords: Carbon Dioxide Capture Using Aqueous MEA Solutions in a Countercurrent Adiabatic Packed-bed Absorber
Date Deposited: 29 Jul 2020 15:19
Last Modified: 29 Jul 2020 15:19
URI: http://d-scholarship.pitt.edu/id/eprint/38593

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