Supercritical Fluid Extraction of Cerium from Aqueous Solutions Using Tributyl Phosphate as a Ligand
Key words: extraction, supercritical fluid, cerium complexes, aqueous solutions, tributyl phosphate
The extraction of Ce(III) and Ce(IV) complexes with tributyl phosphate (TBP) from aqueous solutions of various acidity in the presence of a salting-out agent (magnesium nitrate) into supercritical (SC) fluids, CO2 and freon R23, was studied under static and dynamic conditions. It is shown that SC-CO2 is a more efficient extractant than freon R23. The efficiency of Ce(III) extraction increases with an increase in the concentration of magnesium nitrate and the amount of TBP in the system and decreases with an increase in the acidity of the aqueous solution. The dependence of the extraction efficiency on pressure is more complex: at a pressure of SC-CO2 below 10 MPa (at 40 °C), the solubility of TBP in it drops sharply. As the pressure rises above this value, the degree of transition of the Ce(III) complex into the fluid phase decreases. An equation for the extraction isotherm is obtained and its parameters are determined for conditions close to optimal for the extraction of Ce(III). Cerium in the form of Ce(IV) is more efficiently extracted by SC-CO2 even at high acidity of the aqueous solution; however, the state of Ce(IV) in the aqueous solution of its complex is unstable; the complete transition to the Ce(III) state occurs within ~14 days. Dynamic extraction using a countercurrent extraction column cannot be described in terms of the «theoretical separation steps» (or «theoretical plates») model. The reason, apparently, is the instability of the TBP solution in the SC-fluid and the formation of a suspension of small drops of liquid TBP, which is a more efficient extractant than the true solution of TBP in the fluid. At the same time, such a transition leads to a sharp increase of the efficiency of the extraction column as a mass transfer apparatus.
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ГОСТ
7.0.100-2018
Supercritical Fluid Extraction of Cerium from Aqueous Solutions Using Tributyl Phosphate as a Ligand / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2022. – Т. 17. – № 1. – С. 3-25. - DOI: 10.34984/SCFTP.2022.17.1.001
TRANSLIT
/ – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2022. – Т. 17. – № 1. – S. 3-25. - DOI: 10.34984/SCFTP.2022.17.1.001
En
Supercritical Fluid Extraction of Cerium from Aqueous Solutions Using Tributyl Phosphate as a Ligand. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 1, 3-25 (2022). https://doi.org/10.34984/SCFTP.2022.17.1.001
Key words: organo-metallic copper complexes, solubility, supercritical carbon dioxide, copper acetylacetonate, impregnation
The solubility of copper (II) acetylacetonate in supercritical carbon dioxide was studied using a circulation-type setup based on the P-401 supercritical fluid extraction system, and the obtained results were compared with the literature data. The solubility of this complex at 323 and 333 K isotherms was additionally investigated. The possibility of using various metal complex copper compounds in the impregnation treatment
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ГОСТ
7.0.100-2018
Solubility of Copper Acetylacetonate(II) in Supercritical Carbon Dioxide as the Basis of polymer Composite materials Modification Technology / – Текст : // Сверхкритические Флюиды: Теория и Практика.. – 2022. – Т. 17. – № 1. – С. 26-36. - DOI: 10.34984/SCFTP.2022.17.1.002
TRANSLIT
Rastvorimost acetilacetonata medi(II) v sverhkriticheskom diokside ugleroda kak osnova tekhnologii modifikacii polimernyh kompozitnyh materialov / – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2022. – Т. 17. – № 1. – S. 26-36. - DOI: 10.34984/SCFTP.2022.17.1.002
En
Solubility of Copper Acetylacetonate(II) in Supercritical Carbon Dioxide as the Basis of polymer Composite materials Modification Technology. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 1, 26-36 (2022). https://doi.org/10.34984/SCFTP.2022.17.1.002
Key words: rapeseed oil hydrolysis, oleic acid oxidation, azelaic acid esterification, heterogeneous catalyst, supercritical conditions, 2-ethylhexyl ether
Three chemical stages of azelaic acid 2-ethylhexyl ester synthesis based on rapeseed oil
were studied: hydrolysis of the initial oil, oxidation of oleic acid in the presence of
palladium-containing heterogeneous catalyst, and esterification of azelaic acid. It is
demonstrated that reactions hydrolysis and esterification can be efficiently carried out
under supercritical conditions (523—653 K and 22.5—30 MPa).
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ГОСТ
7.0.100-2018
On the Efficiency of Carrying out Chemical Reactions under Supercritical Conditions During the Synthesis of Azelaic Acid 2-Ethylhexyl Ether Based on Rapseed Oil / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2022. – Т. 17. – № 1. – С. 37-48. - DOI: 10.34984/SCFTP.2022.17.1.003
TRANSLIT
Izuchenie vozmozhnosti provedeniya v sverhkriticheskih usloviyah himicheskih reakcij pri sinteze 2-etilgeksilovogo efira azelainovoj kisloty na osnove rapsovogo masla / – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2022. – Т. 17. – № 1. – S. 37-48. - DOI: 10.34984/SCFTP.2022.17.1.003
En
On the Efficiency of Carrying out Chemical Reactions under Supercritical Conditions During the Synthesis of Azelaic Acid 2-Ethylhexyl Ether Based on Rapseed Oil. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 1, 37-48 (2022). https://doi.org/10.34984/SCFTP.2022.17.1.003
Key words: supercritical fluid extraction, carbon dioxide, acid-base hydrolysis, epigean lichen, Peltigera aphthosa, chitin-containing complex
This research was funded with the financial support of the Ministry of Economic
Development, Industry and Science of the Arkhangelsk Region within the framework of the
project «Obtaining a new chitin-containing material (product) for veterinary and biological
purposes from promising plant sources of the Arkhangelsk Region» (agreement No. 2 dated
September 22, 2021), the Ministry of Science and Higher formation of the Russian Federation
in terms of supercritical fluid extraction (project No. FSRU-2021-0009. Instrumentation of
the Core Facility Center «Arktika» of Northern (Arctic) Federal University and «Critical
technologies of the Russian Federation in the field of environmental safety of the Arctic»
(N. Laverov Federal Center for Integrated Arctic Research) was used in this work.
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ГОСТ
7.0.100-2018
Isolation of Chitin-Containing Complexes from the Thalli of the Lichen Species Peltigera Aphthosa / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2022. – Т. 17. – № 1. – С. 49-65. - DOI: 10.34984/SCFTP.2022.17.1.004
TRANSLIT
Vydelenie hitinsoderzhashchih kompleksov iz talloma lishajnika vida Peltigera aphthosa / – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2022. – Т. 17. – № 1. – S. 49-65. - DOI: 10.34984/SCFTP.2022.17.1.004
En
Isolation of Chitin-Containing Complexes from the Thalli of the Lichen Species Peltigera Aphthosa. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 1, 49-65 (2022). https://doi.org/10.34984/SCFTP.2022.17.1.004
Key words: water, supercritical propane/butane mixture, phase equilibrium, solubility, thermodynamic model, Peng—Robinson equation of state
The results of an experimental study of the phase equilibrium of the «water—propane/butane»
system carried out in the temperature range of 403—443 K and the pressure range
of 5.28—20.66 MPa using a high-pressure optical cell are presented. The V type of phase
behavior is established. The solubility of water in a supercritical propane-butane mixture
under the above mentioned thermodynamic conditions is estimated based on the
characteristics of the steam branch of the phase equilibrium of the «water—propane/butane»
system and described using the Peng—Robinson equation of state in combination
with the Mukhopadhyay and Rao mixing rule was made.
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ГОСТ
7.0.100-2018
Phase Equilibrium of the Binary System «Water—Propane/Butane» / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2022. – Т. 17. – № 1. – С. 66-75. - DOI: 10.34984/SCFTP.2022.17.1.005
TRANSLIT
Fazovoe ravnovesie binarnoj sistemy «voda—propan/butan» / – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2022. – Т. 17. – № 1. – S. 66-75. - DOI: 10.34984/SCFTP.2022.17.1.005
En
Phase Equilibrium of the Binary System «Water—Propane/Butane». Sverhkriticheskie Flyuidy: Teoriya i Praktika, 1, 66-75 (2022). https://doi.org/10.34984/SCFTP.2022.17.1.005
Key words: palm oil, Shea oil, ethanol, sub- and supercritical fluid conditions, transesterification, biodiesel, kinematic viscosity coefficient
The results of an experimental study of the process of obtaining biodiesel fuel by
transesterification of Shea (Karite) and palm oils carried out in ethanol under supercritical
fluid conditions on a batch unit using preliminary ultrasonic emulsification of the reaction
mixture are presented. The studies were carried out in a temperature range of 623—673 K
at a pressure of 30 MPa, a range of «alcohol—oil» molar ratios of 30—42, and a reaction
duration of 30 minutes. Preferred reaction conditions have been established. The results
of an experimental study of the kinematic viscosity of samples of initial oils and the
product of the transesterification reaction The results of an experimental study of the
kinematic viscosity of samples of initial oils and the product of the transesterification
reaction are presented.
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ГОСТ
7.0.100-2018
The Transeterification of Shea (Karite) and Palm Oils in Supercritical Ethanol / – Текст : непосредственный // Сверхкритические Флюиды: Теория и Практика.. – 2022. – Т. 17. – № 1. – С. 76-88. - DOI: 10.34984/SCFTP.2022.17.1.006
TRANSLIT
Pereeterifikaciya masla dereva SHi (Karite) i pal'movogo masla v sverhkriticheskom etanole / – Sverhkriticheskie Flyuidy: Teoriya i Praktika.. – 2022. – Т. 17. – № 1. – S. 76-88. - DOI: 10.34984/SCFTP.2022.17.1.006
En
The Transeterification of Shea (Karite) and Palm Oils in Supercritical Ethanol. Sverhkriticheskie Flyuidy: Teoriya i Praktika, 1, 76-88 (2022). https://doi.org/10.34984/SCFTP.2022.17.1.006