Increased carbon dioxide absorption rates in carbonate solutions through surfactant addition

Spigarelli, Brett P.; Hagadone, P. C.; Kawatra, S. Komar

doi:10.1007/bf03402411

Cited by 2 publications

(3 citation statements)

References 18 publications

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“…Surfactant additives have previously been shown to increase the interfacial area (and thus the gas absorption) in a bubble column. 13,29,30 Our own experiments in a bubble column confirm that the surfactant enhances absorption; an increased level of bubbling was observed, even though we used a simple glass inlet rather than a gas diffuser (which enhances bubbling) (Figure 7).…”

Section: ■ Results and Discussionsupporting

confidence: 74%

Enhanced Carbon Capture through Incorporation of Surfactant Additives

Bryant

Lippert

et al. 2016

Ind. Eng. Chem. Res.

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The CO 2 absorption properties of monoethanolamine (MEA) solutions containing varying amounts of surfactant were examined using different experimental apparatus: a packed column, a stirred reactor, a wetted wall column, and a bubble column. The carbon capture efficiency in the packed column was improved by the addition of surfactant. Surface tension measurements of the different solutions were taken over a range of CO 2 loadings, and the addition of surfactant was seen to lower the surface tension of the amine solvent. However, the improvement in carbon capture efficiency could not be fully correlated to the surface tension depression. The addition of surfactant improved CO 2 absorption in the packed and bubble columns, while the surfactant inhibited absorption in the stirred reactor and wetted wall column experiments. Visual inspection of solvent flowing down a packed column revealed the gas to be bubbling through the liquid, which increases the gas−liquid interfacial area and thus the overall level of mass transfer of carbon dioxide into solution. ■ INTRODUCTIONThere is growing concern about the emission of carbon dioxide into the atmosphere and the associated environmental impact. 1 As a result, reducing CO 2 emissions is of global interest. Significant progress in this area might be made by reducing carbon dioxide emissions from large, stationary point sources such as power plants. 2 For this purpose, carbon capture and storage (CCS) using aqueous amine solvents is well understood and can be implemented at these point sources. 3,4 In this report, we discuss some of our work on improving the absorption of CO 2 by amines for such applications.Absorption of carbon dioxide by an amine solvent consists of the gaseous CO 2 being absorbed into the liquid and the subsequent chemical reaction with the amine. Thus, there are both physical and chemical limitations to this process. The physical aspects of absorption (dissolution of CO 2 into the liquid and product and reactants diffusing to and from the gas− liquid reaction interface) are dependent on the CO 2 , product, and amine concentration gradients and localized mixing. 5 In this work, we focus on lowering the physical resistance to CO 2 absorption by using a surfactant. Surfactants in aqueous systems have been proposed to increase gas−liquid interfacial turbulence (Marangoni instability) and thereby increase the level of mass transfer, 6−8 though it is not clear that this instability is present in systems that feature a rapid chemical reaction such as the CO 2 −aqueous amine system. 9 In fact, there are numerous other reports that say the opposite; i.e., surfactant additives decrease the level of mass transfer of gases (N 2 , CO 2 , and O 2 ) into aqueous amine solutions and pure water. 10−15 One consideration when evaluating these contradictory results is the surfactant itself. Shorter hydrophobic chain lengths (≤10 carbons) were shown to enhance mass transfer at low concentrations, 6−8 whereas surfactants with longer hydrophobic chain lengths (>10 carbons) re...

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Section: ■ Results and Discussionsupporting

confidence: 74%

Enhanced Carbon Capture through Incorporation of Surfactant Additives

Bryant

Lippert

et al. 2016

Ind. Eng. Chem. Res.

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“…The focus of this paper is to examine the affect a polypropylene glycol methyl ether (PPGME) surfactant will have on the gas-liquid interfacial area and liquid-side mass transfer coefficient, and consequently the absorption rate of CO2 into the carbonate solution. Absorption rate and bubble size data from a previous study [167] will be combined with data on gas hold-up and bubble rise velocity to explain how the surfactant is affecting the gas-liquid interfacial area and liquid side mass transfer coefficient. Experimental liquid-side mass transfer coefficients will be compared to theoretical models to explain the behavior of the surfactant and propose further ways to increase CO2 absorption in carbonate solutions.…”

Section: Chapter 6: the Effect Of Surfactant Addition On Carbon Dioximentioning

confidence: 99%

“…Coal fly ash is a promising waste material as it is produced at large CO2 point sources (coal combustion power plants), cheap, in powdered form, and high in calcium content.The goal of the present work was to study the feasibility of the proposed CCS system. The initial capture stage of this system has already been explored in detail in previous work[148,167,199]. The article is divided into two sections.…”

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confidence: 99%

A Novel Approach to Carbon Dioxide Capture and Storage

Spigarelli¹

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Increased carbon dioxide absorption rates in carbonate solutions through surfactant addition

Cited by 2 publications

References 18 publications

Enhanced Carbon Capture through Incorporation of Surfactant Additives

Enhanced Carbon Capture through Incorporation of Surfactant Additives

A Novel Approach to Carbon Dioxide Capture and Storage

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