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ndltd-OhioLink-oai-etd.ohiolink.edu-akron13129268522021-08-03T05:26:32Z Study of Thermal Degradation for Solid Amines During CO<sub>2</sub> Capture Cycling and Mechanism of Porous Polymer Formation Vafadari, Abtin <p>Global warming has become one of the major concerns of the industrial world. Among the pollutants, CO<sub>2</sub> has the highest impact on the climate change. Many techniques have been proposed to capture carbon dioxide from exhaust gas of the plants and factories. Temperature swing adsorption (TSA) is the most promising technique for CO<sub>2</sub> capture due to low capital cost, heat of regeneration, toxicity and corrosive properties.</p><p>Amine based sorbents can be applied for low temperature carbon dioxide separation from plant exhaust gases. Gas stream after passing through a packed adsorption bed will go to other separation units depending on requirements of the plant or it will be released into atmosphere. After the adsorption bed reaches into saturation point, control system will bypass that process unit and redirect the gas stream to another packed bed with fresh sorbents while the saturated bed is heating for regeneration. Thermal cycling in presence of exhaust gases can cause thermal and oxidative degradation of the sorbents over a long time frame. Also the high temperature of heating during the regeneration can cause some of the species to evaporate.</p><p>For our in-house built sorbent, Tetraethylenepentamine (TEPA) is the amine source and EPON 826 is used to initiate the long chain polymers for holding the amine groups on the surface of the sorbents and inhibit them from evaporation. After exposure to a certain number of thermal cycles which causes sorbent degradation, they must be replaced with fresh sorbents but unit overhauls are costly and plant owners prefer to avoid that.</p><p>There are two suggestions for reduction of overhaul costs due to sorbent deformation: One suggestion is to regenerate the sorbents in their original location by washing them with a cheap solution to improve the performance of the sorbents and the other was, to optimize the sorbents so they can resist to more number of thermal cycles. In this study, the amine degradation due to thermal cycling was studied and it was proved that irreversible reactions between CO<sub>2</sub> and amine groups or chemisorbed species are the reasons for degradation of sorbents.</p><p>The other issue in CO<sub>2</sub> adsorption by amine based sorbents is the evaporation of amines which can cause environmental issues. By making a porous polymer to replace solid sorbents evaporation of amines to atmosphere can be avoided. After concentration optimization and rapid heating the liquid phase polymers, porous polymer with high porosity was achieved. Although this polymer had a good number of macro pores but it did not have enough capture capacity, further investigation is required to address this issue.</p> 2011-08-25 English text University of Akron / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=akron1312926852 http://rave.ohiolink.edu/etdc/view?acc_num=akron1312926852 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
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NDLTD
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English
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NDLTD
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| author |
Vafadari, Abtin
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Vafadari, Abtin
Study of Thermal Degradation for Solid Amines During CO<sub>2</sub> Capture Cycling and Mechanism of Porous Polymer Formation
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| author_facet |
Vafadari, Abtin
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Vafadari, Abtin
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| title |
Study of Thermal Degradation for Solid Amines During CO<sub>2</sub> Capture Cycling and Mechanism of Porous Polymer Formation
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| title_short |
Study of Thermal Degradation for Solid Amines During CO<sub>2</sub> Capture Cycling and Mechanism of Porous Polymer Formation
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| title_full |
Study of Thermal Degradation for Solid Amines During CO<sub>2</sub> Capture Cycling and Mechanism of Porous Polymer Formation
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| title_fullStr |
Study of Thermal Degradation for Solid Amines During CO<sub>2</sub> Capture Cycling and Mechanism of Porous Polymer Formation
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| title_full_unstemmed |
Study of Thermal Degradation for Solid Amines During CO<sub>2</sub> Capture Cycling and Mechanism of Porous Polymer Formation
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| title_sort |
study of thermal degradation for solid amines during co<sub>2</sub> capture cycling and mechanism of porous polymer formation
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| publisher |
University of Akron / OhioLINK
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| publishDate |
2011
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| url |
http://rave.ohiolink.edu/etdc/view?acc_num=akron1312926852
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| work_keys_str_mv |
AT vafadariabtin studyofthermaldegradationforsolidaminesduringcosub2subcapturecyclingandmechanismofporouspolymerformation
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| _version_ |
1719420180266745856
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