Carbon dioxide capture capacity of sodium hydroxide aqueous solution

Yoo, Min; Han, Sang‐Jun; Wee, Jung‐Ho

doi:10.1016/j.jenvman.2012.10.061

Cited by 182 publications

(111 citation statements)

References 33 publications

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“…These include a CO 2 -mediated synthesis of cellulose carbonate in different solvents as an intermediate step towards improved dissolution in NaOH(aq) (Oh et al 2002(Oh et al , 2005; dissolution of cellulose in switchable ionic liquids based on interactions between CO 2 and strong organic bases (Zhang et al 2013;Xie et al 2014) and activation of cellulose by CO 2 for a subsequent acetylation (Yang et al 2015). Moreover, in terms of NaOH(aq), the presence of dissolved CO 2 is likely to affect the properties of the solvent system itself by consuming the hydroxide ions in well-known conversions to HCO 3 -and CO 3 2- (Yoo et al 2013) and should as such be taken into account. Aqueous hydroxide sorbents, in itself, have been widely studied for direct capture of CO 2 from air (Sanz-Pérez et al 2016), but the only notation of possible effects of CO 2 on cellulose in an alkaline aqueous system could be found in a work of Pakshver and Kipershlak, dealing with effects of carbonate ions on xanthogenation and dissolution (Pakshver and Kipershlak 1980).…”

Section: Introductionmentioning

confidence: 99%

Chemisorption of air CO2 on cellulose: an overlooked feature of the cellulose/NaOH(aq) dissolution system

2017

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A natural abundance of the air CO 2 in NaOH(aq) at low temperature was investigated in terms of cellulose-CO 2 interactions upon cellulose dissolution in this system. An organic superbase, namely 1,8-diazabicyclo[5.4.0]undec-7-ene, DBU, known for its ability to incorporate CO 2 in carbohydrates, was employed in order to shed light on this previously overlooked feature of NaOH(aq) at low temperature. The chemisorption of CO 2 onto cellulose was investigated using spectroscopic methods in combination with suitable regeneration procedures. ATR-IR and NMR characterisation of regenerated celluloses showed that chemisorption of CO 2 onto cellulose during its dissolution in NaOH(aq) takes place both with and without employment of the CO 2 -capturing superbase. The chemisorption was also observed to be reversible upon addition of water: CO 2 desorbed when water was used as regenerating agent but could be preserved when instead ethanol was used. This finding could be an important parameter to take into consideration when developing processes for dissolution of cellulose based on this system.

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Section: Introductionmentioning

confidence: 99%

Chemisorption of air CO2 on cellulose: an overlooked feature of the cellulose/NaOH(aq) dissolution system

2017

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“…Compared with other scrubbers, the use of a continuous bubble-column scrubber is a powerful process for the removal of carbon dioxide since it has a simple construction, higher heat and mass transfer coefficients, higher removal efficiency and effective control of the liquid residence time (Chen et al, 2008;Fleischer et al, 1996). In addition, the scrubbing factor of CO 2 gas in an alkaline solution was found to be excellent in a bubble column, compared with another scrubber; thus, a continuous bubble column absorber has become the scrubber adopted by some researchers for their studies (Petrov et al, 2006;Lau et al, 2012;Yoo et al, 2013;Cheng et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Optimum conditions for the capture of carbon dioxide with a bubble-column scrubber

Chen

Huang

et al. 2015

International Journal of Greenhouse Gas Control

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“…, a formação do NaHCO 3 é mais evidente. Sendo assim, observando as Figuras 6 a 9, e tomando como base as relações entre as concentrações de saída do reator gás-líquido, verifica-se que, para concentrações de NaOH elevadas, a relação entre o Na 2 CO 3 formado com o NaHCO 3 é da ordem de 2%, justificando que a formação do NaHCO 3 pode ser ignorada, como afirma Danckwerts, 25 Astarita, 11 Fleisher, 26 Yoo. 27 Mas a partir do instante que a concentração de NaOH decresce devido a reação com CO 2 , a formação do NaHCO 3 não pode ser desprezada, pois a relação entre os produtos formados Na 2 CO 3 e NaHCO 3 faz-se presente, sendo da ordem de 13,5%, justificando Hikita.…”

Section: Avaliação Do Ph Na Solução De Saídaunclassified

Experimental Methodology for Gas-Liquid Systems

2016

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publicado na web em 22/02/2016 EXPERIMENTAL METHODOLOGY FOR GAS-LIQUID SYSTEMS. Although the gas-liquid reactions are employed in many industrial processes, this issue in the most of time is not included in the curriculum of Chemistry and Chemical Engineering courses. This work aims to propose the study of gas-liquid reaction for the degree course, considering a widespread system, the reaction of CO 2 -NaOH. A reaction mechanism was proposed considering all the intermediate reactions. For each point collected in the outlet solution all the products formed were quantified included residual absorbing solutions. The pH of the outlet solution received a special attention, because with this information was possible to study the controversy that there is in the state of art between some authors in consider the product of the reaction bicarbonate when under conditions of high temperature of or long exposure time of the liquid to gas. For this study was used a continuous stirred-tank reactor in which the gas phase simulate a bubble with a defined size in contact with the liquid phase. The experimental were made by trails under atmospheric pressure, using a feed mixture containing 76% to 69% of CO 2 and 24% to 31% of synthetic air and as liquid solution sodium hydroxide 0.015 mol L . The experimental results obtained and the behavior of CO 2 -NaOH reaction were compared with the data reported in the literature and show a good performance.Keywords: gas-liquid reactions; alkaline solutions; pH; carbonates; bicarbonates. INTRODUÇÃOReações gás-líquido são empregadas em muitos processos industriais e frequentemente o maior interesse nessas reações compreende os processos de separação e purificação, bem como os processos de síntese para a obtenção de produtos.1-3 Apesar disso, este tema na maioria das vezes não é incluído no currículo dos cursos de química e engenharia química, 3 devido ao fato que as reações gás-líquido serem sistemas reagentes bifásicos, o que torna seu estudo mais complexo do que das reações em fase homogênea (líquida ou gás), pois é necessário considerar, simultaneamente, o fenômeno cinético e o de transferência da massa. Aliado a esse aspecto, junta-se a falta de equipamentos de laboratório, de custo acessível, que permitam realizar experimentos quantitativos com essas reações. O equipamento descrito neste artigo visa suprir esta lacuna e permitir que as reações gás-líquido possam ser mais amiúde assunto de experimentos didáticos.O estudo do comportamento destas reações com relação à ciné-tica, bem como os fenômenos físicos envolvidos no sistema como área interfacial efetiva e os coeficientes de transferência de massa deveriam ser mais estudados, pois erros nestes parâmetros podem acarretar em falhas de projeto. 4 Entretanto, os aspectos químicos das reações gás-líquido são costumeiramente abordados de maneira simples considerando se a reação é lenta ou rápida, se apresenta uma cinética linear ou não linear, e qual fase é a limitante na reação. Embora estes tópicos sejam importantes para uma apresentação ...

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Carbon dioxide capture capacity of sodium hydroxide aqueous solution

Cited by 182 publications

References 33 publications

Chemisorption of air CO2 on cellulose: an overlooked feature of the cellulose/NaOH(aq) dissolution system

Chemisorption of air CO2 on cellulose: an overlooked feature of the cellulose/NaOH(aq) dissolution system

Optimum conditions for the capture of carbon dioxide with a bubble-column scrubber

Experimental Methodology for Gas-Liquid Systems

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