Thermodynamics of aqueous methyldiethanolamine (MDEA) and methyldiethanolammonium chloride (MDEAH+Cl−) over a wide range of temperature and pressure: Apparent molar volumes, heat capacities, and isothermal compressibilities

Hawrylak, Brent; Palepu, R.; Tremaine, Peter R.

doi:10.1016/j.jct.2005.10.013

Cited by 17 publications

(26 citation statements)

References 40 publications

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“…Experimental values of the apparent molar volumes,, of the chloride salts are listed in Tables to 10. As in our earlier work, − the effect of the excess HCl was subtracted by applying Young's rule as follows where m 2 , V φ ,2 , m 3 , and V φ ,3 are the molality and the contribution toof the alkanolamminium chloride and the excess HCl, respectively. In these very dilute solutions, V φ ,3 (H + Cl - , aq) were assumed to be approximately equal to(H + Cl - , aq) whose values were obtained from Sharygin and Wood .…”

Section: Resultsmentioning

confidence: 99%

“…The estimated uncertainty in the molalities was within ±0.2%. Stock solutions of chloride salts of the amines were prepared by adding a weighed amount of standard HCl to the stock solutions of neutral amine (R 3 N) in excess of the amine by about 1 mol percent, so as to suppress the hydrolysis of R 3 NH + Cl - by maintaining acidic conditions . The presence of oxygen/air in the flow system was minimized by using freshly boiled Nanopure water in the HPLC syringe pump.…”

Section: Methodsmentioning

confidence: 99%

“…The thermal stability of some of these compounds has been quite well established from their behavior in nuclear and thermal steam generators, where they are often present as pH control agents or as contaminants. Our first such studies determined C p,2 o from 10 to 55 °C, and V 2 o at temperatures up to 300 °C, for aqueous morpholine, 11 dimethylamine (DMA), 12 nolamine (MDEA), 13 and their chloride salts. The standard partial molar volumes for all these solutes approach large positive values at elevated temperatures, consistent with a lowering of the critical temperature in the solutions relative to water, and the effect in the chloride salts is reversed.…”

Section: Introductionmentioning

confidence: 99%

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Standard Partial Molar Volumes of Some Aqueous Alkanolamines and Alkoxyamines at Temperatures up to 325 °C: Functional Group Additivity in Polar Organic Solutes under Hydrothermal Conditions

Bulemela

Tremaine

2008

J. Phys. Chem. B

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Apparent molar volumes of dilute aqueous solutions of monoethanolamine (MEA), diethanolamine (DEA), triethanolamine (TEA), N,N-dimethylethanolamine (DMEA), ethylethanolamine (EAE), 2-diethylethanolamine (2-DEEA), and 3-methoxypropylamine (3-MPA) and their salts were measured at temperatures from 150 to 325 degrees C and pressures as high as 15 MPa. The results were corrected for the ionization and used to obtain the standard partial molar volumes, Vo2. A three-parameter equation of state was used to describe the temperature and pressure dependence of the standard partial molar volumes. The fitting parameters were successfully divided into functional group contributions at all temperatures to obtain the standard partial molar volume contributions. Including literature results for alcohols, carboxylic acids, and hydroxycarboxylic acids yielded the standard partial molar volume contributions of the functional groups >CH-, >CH2, -CH3, -OH, -COOH, -O-, -->N, >NH, -NH2, -COO-Na+, -NH3+Cl-, >NH2+Cl-, and -->NH+Cl- over the range (150 degrees C

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Standard Partial Molar Volumes of Some Aqueous Alkanolamines and Alkoxyamines at Temperatures up to 325 °C: Functional Group Additivity in Polar Organic Solutes under Hydrothermal Conditions

Bulemela

Tremaine

2008

J. Phys. Chem. B

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“…Recently, aminium salts were suggested to be at least partially responsible for new particle formation events, and their ability to thermally stabilize nitrates was studied by Salo et al (2011) . The growing interest in aminium salts in atmospheric aerosol has also led to studies of their relevant properties − and their chemical reactions with atmospherically relevant compounds. ,− Very recently Chu and Chan (2017) studied uptake of dimethyl amine by ammonium sulfates and its mixture with sucrose. The toxicology of amines was reviewed by Knaak et al (1997); more recently, the toxicology of MEA was studied by Kamijo et al (2009) …”

Section: Introductionmentioning

confidence: 99%

Single Usage of a Kitchen Degreaser Can Alter Indoor Aerosol Composition for Days

Schwarz

Makeš

Ondráček

et al. 2017

Environ. Sci. Technol.

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To the best of our knowledge, this study represents the first observation of multiday persistence of an indoor aerosol transformation linked to a kitchen degreaser containing monoethanol amine (MEA). MEA remaining on the cleaned surfaces and on a wiping paper towel in a trash can was able to transform ammonium sulfate and ammonium nitrate into (MEA)SO and (MEA)NO. This influence persisted for at least 60 h despite a high average ventilation rate. The influence was observed using both offline (filters, impactors, and ion chromatography analysis) and online (compact time-of-flight aerosol mass spectrometer) techniques. Substitution of ammonia in ammonium salts was observed not only in aerosol but also in particles deposited on a filter before the release of MEA. The similar influence of other amines is expected based on literature data. This influence represents a new pathway for MEA exposure of people in an indoor environment. The stabilizing effect on indoor nitrate also causes higher indoor exposure to fine nitrates.

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“…For T = 283 K: black ◆, Bernal-Garcia et al; ◇, Hawrylak et al; gray ◆, Welsh and Davis . For T = 298 K: black ●, Al-Ghawas et al; ○, Alvarez et al; gray ●, Bernal-Garcia et al; black ◓, Hawrylak et al; gray ◓, Hawrylak et al; black ◑, Han et al; gray ◑, Maham et al; black ◒, Mandal et al; gray ◒, Muhammad et al; black ◐, Rinker and Sandall; gray ◐, Weiland; black top-half-shaded triangles, Weiland et al. .…”

Section: Resultsmentioning

confidence: 99%

Solubility of Nitrous Oxide in Aqueous Methyldiethanolamine Solutions

2017

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The solubility of nitrous oxide in a 20 mass % aqueous solution of methyldiethanolamine (MDEA) was measured at the temperatures of (283.15, 298.15, 323.15, 348.15, 373.15, and 398.15) K at pressures up to 20.37 MPa. In addition, the solubility of nitrous oxide in a 40 mass % aqueous solution of MDEA was measured at temperatures of (274.15, 283.15, 298.15, 323.15, 348.15, 373.15, and 398.15) K at pressures up to 20.57 MPa. The individual data sets were correlated with the Peng–Robinson equation of state with temperature-dependent binary interaction parameters. The correlation approach reproduced the experimental data to within an overall average percent deviation in the N2O liquid-phase mole fraction of 3.5% and 4.5% in the 20 mass % and 40 mass % MDEA solutions, respectively. The Peng–Robinson equation of state combined with the Krichevsky–Ilinskaya equation were used to obtain Henry’s law constants, partial molar volumes at infinite dilution, and Margules parameters for these systems. The new Henry’s law constants were correlated with the Li–Mather model. The new binary (N2O + MDEA) interaction energy parameters correlated the Henry’s law constants of N2O in both of the aqueous MDEA solutions to within 1.2%. As part of the solubility and Henry’s law constant model development, new models for the density of pure MDEA and (MDEA + H2O) solutions were developed. These models could reproduce the literature density data of pure MDEA and aqueous MDEA solutions to within 0.10% and 0.13%, respectively.

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Thermodynamics of aqueous methyldiethanolamine (MDEA) and methyldiethanolammonium chloride (MDEAH+Cl−) over a wide range of temperature and pressure: Apparent molar volumes, heat capacities, and isothermal compressibilities

Cited by 17 publications

References 40 publications

Standard Partial Molar Volumes of Some Aqueous Alkanolamines and Alkoxyamines at Temperatures up to 325 °C: Functional Group Additivity in Polar Organic Solutes under Hydrothermal Conditions

Standard Partial Molar Volumes of Some Aqueous Alkanolamines and Alkoxyamines at Temperatures up to 325 °C: Functional Group Additivity in Polar Organic Solutes under Hydrothermal Conditions

Single Usage of a Kitchen Degreaser Can Alter Indoor Aerosol Composition for Days

Solubility of Nitrous Oxide in Aqueous Methyldiethanolamine Solutions

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