Thermophysical Properties of Aqueous Piperazine and Aqueous (<i>N</i>-Methyldiethanolamine + Piperazine) Solutions at Temperatures (298.15 to 338.15) K

Ali, Muhammad Intizar; Mutalib, M.I. Abdul; Murugesan, Thanabalan; Shafeeq, Amir

doi:10.1021/je9000069

Cited by 56 publications

(48 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Correlations by Liu et al (2012) and by Samanta and Bandyopadhyay (2006) are in good agreement with experimental data (Derks et al, 2005;Freeman and Rochelle, 2011;Liu et al, 2012;Muhammad et al, 2009;Samanta and Bandyopadhyay, 2006;Samanta et al, 2007;Sun et al, 2005).…”

Section: Theoretical Basissupporting

confidence: 84%

“…Most of data (Derks et al, 2005;Liu et al, 2012;Muhammad et al, 2009;Samanta and Bandyopadhyay, 2006;Samanta et al, 2007;Sun et al, 2005) and of correlations (Freeman and Rochelle, 2011;Liu et al, 2012;Samanta and Bandyopadhyay, 2006) are related to temperature and PZ concentration; Freeman and Rochelle (2011) have studied the influence of the absorbed amount of CO 2 , by determining experimental values for density and by proposing a correlation. The model by Samanta and Bandyopadhyay (2006) well agrees with experimental data of density for a solution containing water and piperazine, covering all the range of temperatures for which experimental data are available, that is from 283.15 K to 338.15 K. This model (Samanta and Bandyopadhyay, 2006), however, does not take into account the influence of carbon dioxide, which should be considered for a complete modeling of the behavior of the rich amine solution.…”

Section: Theoretical Basismentioning

confidence: 99%

See 1 more Smart Citation

Physical properties of PZ solution used as a solvent for CO2 removal

Moioli

Pellegrini

2015

Chemical Engineering Research and Design

View full text Add to dashboard Cite

Section: Theoretical Basissupporting

confidence: 84%

Section: Theoretical Basismentioning

confidence: 99%

Physical properties of PZ solution used as a solvent for CO2 removal

Moioli

Pellegrini

2015

Chemical Engineering Research and Design

View full text Add to dashboard Cite

“…The compositions measured by Bishnoi and Rochelle 10 compare well to the measurements of this work even though the discontinuity they mention does not exist in practice. On the contrary, Muhammad et al 11 listed the solubilities in terms of mole fractions which are not comparable to any of the shown works. By instead converting their measured molarities using the density correlation of Cullinane, 19 the results shown in Figure 1 were obtained.…”

Section: Resultsmentioning

confidence: 78%

“…4 A more accurate anhydrous melting point was estimated by Witschonke 7 of (111.4 and 111)°C by Hetzer et al, 8 which is in line with the chemical supplier of this work. Rosso and Carbonnel 4 present a 10 studied SLE by dissolution of the anhydrous PZ until equilibrium, and titration was applied in the analysis of the liquid phase which was repeated by Muhammad et al 11 Hilliard 12 applied a DSC technique similar to Rosso and Carbonnel. 4 No apparent studies are available on SLE in the binary AMPÀH 2 O system or in the ternary AMPÀPZÀH 2 O system.…”

Section: 2mentioning

confidence: 99%

Aqueous Solubility of Piperazine and 2-Amino-2-methyl-1-propanol plus Their Mixtures Using an Improved Freezing-Point Depression Method

Fosbøl¹,

Neerup²,

Arshad³

et al. 2011

J. Chem. Eng. Data

View full text Add to dashboard Cite

In this work the solidÀliquid equilibrium (SLE) and freezing-point depression (FPD) in the electrolytic binary aqueous systems piperazine (PZ, and aqueous 2-amino-2-methyl-1-propanol (AMP, were measured. The FPD and solubility were also determined in the ternary AMPÀPZÀH 2 O system. A method was developed by which solubility can be determined at higher temperatures using the FPD setup. A total of 86 data points are listed in the full concentration range from (À35 to 90)°C. The solid phases piperazine hexahydrate (PZ 3 6H 2 O), piperazine hemihydrate (PZ 3 1/2H 2 O), and anhydrous PZ precipitated during the experiments. The data can be used in the formulation, prevention, or intentional formation of slurries in piperazine solvents for promoting CO 2 capture using absorption and desorption. INTRODUCTIONCO 2 capture is an openly debated topic for carbon emission reduction to reduce pollution by greenhouse gases. Process streams containing carbon dioxide can be cleaned by absorption in aqueous liquid solvents. Amines, strong bases, or combination of the two are typically used as active components. The low heats of absorption and desorption are design criteria that reduce the cost of energy in regeneration of the solvent. This is obtained by using sterically hindered amines. The result is often slow reaction kinetics between the solvent and CO 2 . Consequently piperazine (PZ) is being used in solution formulation to create an enhanced CO 2 capture solvent. PZ can be used with both amine and potash solutions (K 2 CO 3 ) to increase the rate of absorption and thereby promote the CO 2 capture.A lower PZ concentration was typically used in literature. Recently the scope has changed, and PZ is now being used at higher concentrations. On increasing the concentration, the solubility limit of PZ is being reached, especially during winter temperatures and even up to room temperature. The unexpected formation of slurries and solids downstream may create unforeseen process conditions, decrease efficiency, and create clogging which will result in unfortunate hazardous operations. In general it could be interesting to provoke the formation of CO 2 containing solids and thereby facilitate and increase the capacity of the capture solvent. CO 2 deprived solids are rarely preferable in terms of CO 2 capture.The aim of this work is to determine the solidÀliquid phase boundary in the two binary PZÀH 2 O and AMPÀH 2 O systems and also in the ternary AMPÀPZÀH 2 O system. 2-Amino-2-methyl-1-propanol (AMP) is a sterically hindered amine. CO 2 absorption in AMP solutions can be promoted by adding PZ.An additional goal of this work was to enhance the utilization of freezing-point depression (FPD) equipment developing a method for the purpose of studying solidÀliquid equilibrium (SLE) behavior in solutions precipitating solids other than ice.

show abstract

“…However, the low aqueous solubility of piperazine [1.7 mol L À1 (146 g L À1 at 20 8C)] [21] and piperazine carbamate [1.3 mol L À1 (170 g L À1 before precipitation)] [22] limits its use as a sole CO 2 capture sorbent. [22] Rather, piperazine is commonly used in catalytic quantities as an absorption accelerator in aqueous solutions of sterically hindered or tertiary amines.…”

Section: Introductionmentioning

confidence: 99%

An FTIR Spectroscopic Study on the Effect of Molecular Structural Variations on the CO2 Absorption Characteristics of Heterocyclic Amines

2011

View full text Add to dashboard Cite

Herein, the reaction between CO(2) and piperidine, as well as commercially available functionalised piperidine derivatives, for example, those with methyl-, hydroxyl- and hydroxyalkyl substituents, has been investigated. The chemical reactions between CO(2) and the functionalised piperidines were followed in situ by using attenuated total reflectance (ATR) FTIR spectroscopy. The effect of structural variations on CO(2) absorption was assessed in relation to the ionic reaction products identifiable by IR spectroscopy, that is, carbamate versus bicarbonate absorbance, CO(2) absorption capacity and the mass-transfer coefficient at zero loading. On absorption of CO(2) , the formation of the carbamate derivatives of the 3- and 4-hydroxyl-, 3- and 4-hydroxymethyl-, and 4-hydroxyethyl-substituted piperidines were found to be kinetically less favourable than the carbamate derivatives of piperidine and the 3- and 4-methyl-substituted piperidines. As the CO(2) loading of piperidine and the 3- and 4-methyl- and hydroxyalkyl-substituted piperidines exceeded 0.5 moles of CO(2) per mole of amine, the hydrolysis of the carbamate derivative of these amines was observed in the IR spectra collected. From the subset of amines analysed, the 2-alkyl- and 2-hydroxyalkyl-substituted piperidines were found to favour bicarbonate formation in the reaction with CO(2) . Based on IR spectral data, the ability of these amines to form the carbamate derivatives was also established. Computational calculations at the B3LYP/6-31+G** and MP2/6-31+G** levels of theory were also performed to investigate the electronic/steric effects of the substituents on the reactivity (CO(2) capture performance) of different amines, as well as their carbamate structures. The theoretical results obtained for the 2-alkyl- and 2-hydroxyalkyl-substituted piperidines suggest that a combination of both the electronic effect exerted by the substituent and a reduction in the exposed area of the nitrogen atom play a role in destabilising the carbamate derivative and increasing its susceptibility to hydrolysis. A theoretical investigation into the structure of the carbamate derivatives of these amines revealed shorter NC bond lengths and a less-delocalised electron distribution in the carboxylate moiety.

show abstract

Thermophysical Properties of Aqueous Piperazine and Aqueous (N-Methyldiethanolamine + Piperazine) Solutions at Temperatures (298.15 to 338.15) K

Cited by 56 publications

References 19 publications

Physical properties of PZ solution used as a solvent for CO2 removal

Physical properties of PZ solution used as a solvent for CO2 removal

Aqueous Solubility of Piperazine and 2-Amino-2-methyl-1-propanol plus Their Mixtures Using an Improved Freezing-Point Depression Method

An FTIR Spectroscopic Study on the Effect of Molecular Structural Variations on the CO2 Absorption Characteristics of Heterocyclic Amines

Contact Info

Product

Resources

About