Amine volatility in CO2 capture

Aqueous ethylenediamine (EDA) has been investigated as a solvent for CO(2) capture from flue gas. EDA can be used at 12 M (mol kg(-1) H(2)O) with an acceptable viscosity of 16 cP (1 cP=10(-3) Pa s) with 0.48 mol CO(2) per equivalent of EDA. Similar to monoethanolamine (MEA), EDA can be used up to 120 degrees C in a stripper without significant thermal degradation. Inhibitor A will effectively eliminate oxidative degradation. Above 120 degrees C, loaded EDA degrades with the production of its cyclic urea and other related compounds. Unlike piperazine, when exposed to oxidative degradation, EDA does not result in excessive foaming. Over much of the loading range, the CO(2) absorption rate with 12 M EDA is comparable to 7 M MEA. However, at typical rich loading, 12 M EDA absorbs CO(2) 2 times slower than 7 M MEA. The capacity of 12 M EDA is 0.72 mol CO(2)/(kg H(2)O+EDA) (for P(CO(2) )=0.5 to 5 kPa at 40 degrees C), which is about double that of MEA. The apparent heat of CO(2) desorption in EDA solution is 84 kJ mol(-1) CO(2); greater than most other amine systems.

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“…Open points represent lean condition, p* CO2 = 0.5 kPa at 40 8C. (PZ data from Nguyen, 2009 [24] . MEA data from Hilliard, 2008 [25] ).…”

Section: Discussionmentioning

confidence: 99%

Aqueous Ethylenediamine for CO₂ Capture

et al. 2010

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“…Piperazine (PZ) is a cyclic diamine which has been used as the promoter for CO 2 capture because of its rapid formation of carbamate with CO 2 . As being a great CO 2 capture promoter, the thermodynamic properties of PZ such as CO 2 solubility, volatility, and heat capacity have been reported in the literature (Ermatchkov et al, 2006;Dugas and Rochelle, 2009;Nguyen et al, 2010) and are listed in Table 1. In a recent report by , PZ is observed to be an effective resistant to oxygen degradation and thermal degradation to a temperature up to 150°C.…”

Section: Chemical Absorption -Amine Absorption/stripping Technologymentioning

confidence: 99%

A Review of CO2 Capture by Absorption and Adsorption

Huang

Tan

2012

Aerosol Air Qual. Res.

1,457

875

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Global warming resulting from the emission of greenhouse gases, especially CO 2 , has become a widespread concern in the recent years. Though various CO 2 capture technologies have been proposed, chemical absorption and adsorption are currently believed to be the most suitable ones for post-combustion power plants. The operation of the chemical absorption process is reviewed in this work, together with the use of absorbents, such as the ionic liquid, alkanolamines and their blended aqueous solutions. The major concerns for this technology, including CO 2 capture efficiency, absorption rate, energy required in regeneration, and volume of absorber, are addressed. For adsorption, in addition to physical adsorbents, various mesoporous solid adsorbents impregnated with polyamines and grafted with aminosilanes are reviewed in this work. The major concerns for selection of adsorbent, including cost, adsorption rate, CO 2 adsorption capacity, and thermal stability, are compared and discussed. More effective and less energy-consuming regeneration techniques for CO 2 -loaded adsorbents are also proposed. Future works for both absorption and adsorption are suggested.

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“…Amine volatility was measured in a stirred 1 L equilibrium cell coupled with a hot gas DX-4000 Fourier Transform Infrared Spectroscopy (FTIR) analyzer (Gasmet Technologies Inc., La Prairie, Canada) as shown in Figure 1 and described previously [19]. The insulated glass reactor was agitated at 350 rpm using an overhead stirrer and temperature in the reactor was controlled by recirculating dimethylsilicone oil.…”

Section: Equilibrium Cell For Volatilitymentioning

confidence: 99%

“…The measured amine volatility of each of the three amine components in the blend is presented in Table 5 as the partial pressure of each amine (P PZ , P MPZ and P DMPZ ). The amine volatility for 8 m PZ and 7 m MEA are also shown for comparison purposes [19]. The CO 2 loading for these two baseline systems were also chosen to mimic the operating conditions expected at the top of the absorber.…”

Section: Amine Volatilitymentioning

confidence: 99%

Piperazine/N-methylpiperazine/N,N’-dimethylpiperazine as an Aqueous Solvent for Carbon Dioxide Capture

Freeman

Chen

Nguyen

et al. 2013

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Re´sume´-Me´lange pipe´razine/N-me´thylpipe´razine/N,N'-dime´thylpipe´razine en solution aqueuse pour le captage du CO 2 -Un me´lange pipe´razine (PZ), N-me´thylpipe´razine (MPZ) et N,N'-dime´thylpipe´razine (DMPZ) en solution aqueuse est de´crit pour le captage du CO 2 par absorption-re´ge´ne´ration. Par rapport a`la pipe´razine concentre´e, ce me´lange permet un gain sur la solubilite´des produits solides et sur la chaleur d'absorption. Aucune insolubilite´n'a e´teó bserve´e a`fort taux de charge en CO 2 contrairement aux solvants a`base de pipe´razine. Ce me´lange a montre´des performances e´quivalentes a`la pipe´razine concentre´e en termes de capacite´et de cine´tique d'absorption du CO 2 , qui sont plus que double´es par rapport a`la traditionnelle MonoEthanolAmine (MEA) a`7 M (30 % massique). Un e´quilibre s'est e´tabli entre les trois constituants qui augmente la stabilite´thermique en comparaison des me´langes traditionnels de solvants. Le principal inconve´nient de ce nouveau syste`me est une volatiliteṕ lus importante des amines dans les conditions de l'absorbeur en comparaison avec le cas de la pipe´razine concentre´e et de la MEA.Abstract -Piperazine/N-methylpiperazine/N,N'-dimethylpiperazine as an Aqueous Solvent for Carbon Dioxide Capture -A blend of piperazine (PZ), N-methylpiperazine (MPZ) and N,N'-dimethylpiperazine (DMPZ) is described as a novel CO 2 capture solvent for aqueous absorption-stripping. This blend provides improved solid solubility and heat of absorption compared to concentrated PZ. No insolubility was observed for regions of high CO 2 loading, unlike PZ solvents. The blend performed like concentrated PZ in terms of CO 2 capacity and CO 2 absorption rate, both of which were more than double that of a traditional 7 molal (30 wt%) MonoEthanolAmine (MEA). Thermal equilibrium was established between the three constituent amines that increases the thermal stability compared to traditional blended solvents. The primary drawback of this novel solvent system is enhanced amine volatility at absorber conditions compared with both concentrated PZ and MEA.

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Amine volatility in CO2 capture

Cited by 175 publications

References 17 publications

Aqueous Ethylenediamine for CO₂ Capture

Aqueous Ethylenediamine for CO₂ Capture

A Review of CO2 Capture by Absorption and Adsorption

Piperazine/N-methylpiperazine/N,N’-dimethylpiperazine as an Aqueous Solvent for Carbon Dioxide Capture

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Amine volatility in CO2 capture

Cited by 175 publications

References 17 publications

Aqueous Ethylenediamine for CO2 Capture

Aqueous Ethylenediamine for CO2 Capture

A Review of CO2 Capture by Absorption and Adsorption

Piperazine/N-methylpiperazine/N,N’-dimethylpiperazine as an Aqueous Solvent for Carbon Dioxide Capture

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Product

Resources

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Aqueous Ethylenediamine for CO₂ Capture

Aqueous Ethylenediamine for CO₂ Capture