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University of Groningen Vapor Pressures of Several Commercially University of Groningen Vapor Pressures of Several Commercially Used Alkanolamines Klepacova, Katarina; Huttenhuis, Patrick J. G.; Derks, Peter W. J.; Versteeg, Geert F.; Klepáčová, Katarína Published in: Journal of Chemical and Engineering Data DOI: 10.1021/je101259r IMPORTANT NOTE: You are advised to consult the publisher's version (publisher's PDF) if you wish to cite from it. Please check the document version below. Document Version Publisher's PDF, also known as Version of record Publication date: 2011 Link to publication in University of Groningen/UMCG research database Citation for published version (APA): Klepacova, K., Huttenhuis, P. J. G., Derks, P. W. J., Versteeg, G. F., & Klepáčová, K. (2011). Vapor Pressures of Several Commercially Used Alkanolamines. Journal of Chemical and Engineering Data, 56(5), 2242-2248. https://doi.org/10.1021/je101259r Copyright Other than for strictly personal use, it is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license (like Creative Commons). The publication may also be distributed here under the terms of Article 25fa of the Dutch Copyright Act, indicated by the “Taverne” license. More information can be found on the University of Groningen website: https://www.rug.nl/library/open-access/self-archiving-pure/taverne- amendment. Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. Download date: 09-10-2021 ARTICLE pubs.acs.org/jced Vapor Pressures of Several Commercially Used Alkanolamines † † † † ‡ Katarína Klepacova, Patrick J. G. Huttenhuis,*, Peter W. J. Derks, and Geert F. Versteeg , † Procede Gas Treating B.V., P.O. Box 328, 7500 AH, Enschede, The Netherlands ‡ Department of Chemical Engineering, University of Groningen, P.O. Box 72, 9700 AB, Groningen, The Netherlands ABSTRACT: For the design of acid gas treating processes, vapor-liquid equilibrium (VLE) data must be available of the solvents to be applied. In this study the vapor pressures of seven frequently industrially used alkanolamines (diethanolamine, N- methylethanolamine, N,N-dimethylethanolamine, N,N-diethylethanolamine, diisopropanol-amine, 2-(2-aminoethoxy)ethanol, 2-amino-2-methyl-1-propanol) were measured in an ebulliometer. The VLE experiments were carried out at presssures between (1 and 400) kPa and at a maximum temperature of 453 K. The experimental data can be used to improve the thermodynamic models in gas treating processes and to determine the amine losses in the absorber and desorber. ’ INTRODUCTION pure components were tested. The pressure of the system was Aqueous solutions of alkanolamines are commonly used in the adjusted accurately with a combination of a vacuum pump and nitrogen supply. The temperature during the VLE experiments industry to remove acidic gases, primarily CO2 and/or H2S, from industrial gas streams, like natural gas and flue gas. Accurate was detected with a precision of 0.1 K. The precision of the mea- experimental vapor-liquid equilibrium (VLE) data are impor- surement of vapor pressure is estimated to be 0.5 % for the low tant parameters for the development of these gas treating pro- pressure data (1 < P < 50 kPa) and 0.2 % for the high pressure cesses. These experimental VLE data are required to regress the data (50 < P < 400 kPa). thermodynamic models used in process simulators for gas treating processes. In open literature, vapor pressure data of several commonly used alkanolamines are limited or even not ’ RESULTS available at all. In this paper, new vapor pressure data as determined in an ebulliometer are presented and compared with Validation Experiments. To test and validate the experimen- literature data, if possible. tal setup, several validation experiments have been carried out with pure water and pure MEA. For these two components ’ sufficient data is available in open literature for data comparison. EXPERIMENTAL SECTION The vapor pressure of water is studied very extensively, and Materials. All chemicals used in this work were provided by scatter in the water vapor pressure is very limited. Accurate data for the water vapor pressure can be found at the National Sigma Aldrich and Acros Organics and used without further 2 purification. Detailed information on these chemicals can be Institute of Standards and Technology (NIST) Web site. In Table 2 the vapor pressure of water at different temperatures as found in Table 1. 2 Experimental Apparatus. The vapor pressure measure- determined in this work is compared with data from literature. Results from numerous studies of the vapor pressure of pure ments were carried out in a modified Swietoslawski ebulli- ff ometer, which is described in detail by Rogalski and Mala- MEA have been reported in the open literature. Di erent exper- nowski.1 In this work, an all-glass Fischer-Labodest apparatus imental methods have been used to obtain the MEA vapor was used and this setup can at present be used between pressure for a wide range of conditions. Therefore, the alkano- pressures from (1 to 400) kPa and a maximum temperature lamine MEA was chosen for an additional validation of the appa- of 453 K. The operation procedure is based on the principle of ratus used in this study. In Table 3, the vapor pressure data of the “circulation method”. A schematic diagram of the appara- MEA as determined in this study are presented, and in Figure 2 a tus is presented in Figure 1. comparison with literature data is shown. During a typical experiment, about 75 mL of solvent was From Table 2 (water) and Figure 2 (MEA), it can be con- initially placed gravimetrically in the ebulliometer. The pressure cluded that the VLE data determined during the above-described controller was set to the required value, and the liquid was heated validation experiments are excellent in line with VLE data reported by the submerged electrical heater (1) and partially evaporated. in open literature within the complete operating range of the VLE is established inside the separation chamber (4). The VLE apparatus. equilibrium vapor is condensed and completely mixed with the liquid phase by flow turbulence (8-9). Both the circulated liquid and the condensed vapor are routed back to the heater to complete the normal circulation. Samples could be taken from Received: November 23, 2010 both the liquid (7) as the condensed vapor phase (6). However, Accepted: February 16, 2011 these sampling points were not used in this work, because only Published: March 09, 2011 r 2011 American Chemical Society 2242 dx.doi.org/10.1021/je101259r | J. Chem. Eng. Data 2011, 56, 2242–2248 Journal of Chemical & Engineering Data ARTICLE Table 1. Details about the Chemicals Used in This Work name CAS No. vendor purity water 7732-18-5 Acros Organics HPLC grade 2-aminoethanol MEA 141-43-5 Sigma-Aldrich > 99.5 % diethanolamine DEA 111-42-2 Acros Organics 99 % N-methylethanolamine MMEA 109-83-1 Sigma-Aldrich 98þ % N,N-dimethylethanolamine DMMEA 108-01-0 Sigma-Aldrich 99.5 % N,N-diethylethanolamine DEMEA 100-37-8 Acros Organics 99 % diisopropanolamine DIPA 110-97-4 Acros Organics 99 % 2-(2-aminoethoxy)ethanol DGA 929-06-6 Acros Organics 98 % 2-amino-2-methyl-1-propanol AMP 124-68-5 Acros Organics 99 % Table 3. Vapor Pressure P of MEA as a Function of Temperature T T/K P/kPa 358.6 3.02 373.0 6.40 385.7 11.7 403.6 24.9 422.7 51.1 432.6 71.8 441.9 97.5 Figure 1. Schematic diagram of the Fischer Labodest apparatus (1, immersion heater; 2, mixing chamber; 3, lengthened contact path; 4, separation chamber; 5, magnetic sample valves; 6, condensed vapor sample takeoff; 7, liquid sample takeoff; 8, 9, circulation streams; 10, sampling port). Figure 2. Experimental data of the vapor pressure P of MEA as function of temperature T: b, this work; 0, Matthews et al.;3 4, McDonald et al.;4 ), Nath and Bender;5 Â, Tochigi et al.6 Table 2. Vapor Pressure of Water (This Work and ’ EXPERIMENTAL RESULTS Literature2) In this section the new results of the (alkanolamine) vapor water this work literature pressure experiments are presented and compared with available literature data. These vapor pressure data have been correlated P/kPa T/K T/K with an Antoine correlation. The Antoine parameters for each alkanolamine are presented at the end of this section. ΔP 11.9 322.6 322.4 represents the absolute error between the measured experimen- 30.9 343.0 342.9 tal value and the Antoine correlation. 69.9 362.9 363.0 Diethanolamine (DEA). In Table 4, the measured VLE data of 100.0 372.4 372.8 DEA are presented, and in Figure 3, a comparison with literature data 150.0 383.9 384.5 is presented. The available VLE data of pure DEA in open literature 270.2 402.3 403.1 show some scatter between the different authors. From Figure 3 it can 400.3 415.8 416.8 be concluded that the new data are in line with other literature sources 2243 dx.doi.org/10.1021/je101259r |J. Chem. Eng. Data 2011, 56, 2242–2248 Journal of Chemical & Engineering Data ARTICLE Table 4. Vapor Pressure of DEA Δ a T/K Pexp/kPa P /kPa 427.5 1.44 0.00 433.0 1.94 0.05 441.4 2.94 0.14 447.4 3.94 0.26 452.4 4.94 0.36 a Δ - P = Pexp Pcalc.
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