Freezing Point Depressions of Aqueous MEA, MDEA, and MEA−MDEA Measured with a New Apparatus

Fosbøl, Philip Loldrup; Pedersen, Mikkel Gielsager; Thomsen, Kaj

doi:10.1021/je100994v

Cited by 21 publications

(45 citation statements)

References 11 publications

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“…There were no indications of hydrate formation at t > À35°C. There is a complete lack of SLE data for comparison, and there is a need 16 whereby both chemicals induce FPD in the aqueous system. The recommendations for avoiding precipitation in the ternary system are equivalent to those for the aqueous PZ system as discussed above.…”

Section: Resultsmentioning

confidence: 99%

“…The apparatus itself was not changed, but the method for determining the phase change was altered. The phase change cannot be recognized the same way Fosbøl et al 16 described it for ice. The heat developed during phase transition is simply not sufficient to show the same distinct temperature phenomena.…”

Section: Methodsmentioning

confidence: 94%

“…Experimental Method. The freezing point of the solutions was determined using the technique outlined by Fosbøl et al 16 The SLE behavior for solutions precipitating solids other than ice were analyzed using two methods. The first method performed was the use of a titration setup described by Fosbøl et al 17 The second method was to determine SLE by the FPD method described below.…”

Section: Methodsmentioning

confidence: 99%

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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

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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.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 94%

Section: Methodsmentioning

confidence: 99%

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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

Self Cite

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“…This is due to an increased viscosity and intrusion of air bubbles, which makes it difficult to have a uniformly stirring and identification of the solid formation. [15] a Standard uncertainties (u) for the temperature, weight fractions, and the pressure are u(°C) = 0.2 °C, u(w) = 0.0001, u(p) = 1 kPa. The temperatures are also reported as the standard deviation of the mean in the table.…”

Section: Resultsmentioning

confidence: 99%

“…The apparatus used to measure the freezing points of the solutions is described by Fosbøl et al 15 .…”

Section: Apparatusmentioning

confidence: 99%

Solid Solubility in the Aqueous 2-Amino-2-methyl-propanol (AMP) Plus Piperazine (PZ) System

2019

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In this work the solid-liquid equilibrium (SLE) of the ternary system 2-amino-2-methyl-propanol (AMP)-piperazine (PZ)-H2O and the aqueous binary system AMP were determined using a freezing point depression (FPD) setup and differential scanning calorimetry (DSC). A total of 59 new data points are listed in the full concentration range of 0 < w(AMP) < 100 % and 0 < w(PZ) < 61 %. The SLE phase boundary of AMP tetrahydrate (AMP•4H2O) was determined and confirmed by its crystal structure obtained from powder x-ray diffraction (PXRD).The new data of this work can be used in the creation of thermodynamic model for prevention of AMP and PZ precipitates from solvents used for CO2 capture. This gives a higher degree of safe

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CCS-Prozesskette

Görner¹,

Hübner²,

Behr³

et al. 2015

CO2: Abtrennung, Speicherung, Nutzung

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Freezing Point Depressions of Aqueous MEA, MDEA, and MEA−MDEA Measured with a New Apparatus

Cited by 21 publications

References 11 publications

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

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

Solid Solubility in the Aqueous 2-Amino-2-methyl-propanol (AMP) Plus Piperazine (PZ) System

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