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Tytuł:
A calculation model for liquid-liquid extraction of protactinium by 2,6-dimethyl-4-heptanol
Autorzy:
Knight, A. W.
Eitrheim, E. S.
Nelson, A. W.
Schultz, M. K.
Powiązania:
https://bibliotekanauki.pl/articles/146380.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
design of experiments
protactinium
solvent extraction
Opis:
Reprocessing of spent nuclear fuel usually employs the solvent extraction technique to recover fissile material, isolate other valuable radionuclides, recover precious metals, and remove contaminants. Effi cient recovery of these species from highly radioactive solutions requires a detailed understanding of reaction conditions and metal speciation that leads to their isolation in pure forms. Due to the complex nature of these systems, identification of ideal reaction conditions for the efficient extraction of specific metals can be challenging. Thus, the development of experimental approaches that have the potential to reduce the number of experiments required to identify ideal conditions are desirable. In this study, a full-factorial experimental design was used to identify the main effects and variable interactions of three chemical parameters on the extraction of protactinium (Pa). Specifi cally we investigated the main effects of the anion concentration (NO3 –, Cl–) extractant concentration, and solution acidity on the overall extraction of protactinium by 2,6-dimethyl-4-heptanol (diisobutylcarbinol; DIBC) from both HCl and HNO3 solutions. Our results indicate that in HCl, the extraction of protactinium was dominated by the solution acidity, while in nitric acid the extraction was strongly effected by the [DIBC]. Based on our results, a mathematical model was derived, that describes the relationship between concentrations of anions, extractant, and solution acidity and the expected values of Pa distribution coefficients in both HCl and HNO3. This study demonstrates the potential to predict the distribution coefficient values, based upon a mathematical model generated by a full-factorial experimental design.
Źródło:
Nukleonika; 2015, 60, No. 4, part 2; 837-845
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Applicability Study of Co and Eu Extraction Using Solvent from Ca Rich HCl Solution
Autorzy:
Oh, Maengkyo
Lee, Keunyoung
Foster, Richard I.
Kim, Ik-Soo
Lee, Chang-Ha
Powiązania:
https://bibliotekanauki.pl/articles/2203724.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
solvent extraction
radioactive wastewater
waste valorization
Cyanex 272
Cyanex 301
Opis:
This study was conducted to treat radioactive acidic wastewater, which contained radioactive 60Co and 152Eu. The wastewater can be generated during a decommissioning project to reduce the volume of radioactive concrete waste from nuclear facilities. With a variety of methods for separating the radioactive nuclides available, we evaluated the separation applicability of the solvent extraction method. From our results, Co and Eu could be easily extracted from the Ca rich wastewater using Cyanex301 (Co extraction (%) 99.8, Eu extraction (%) 99.6) without Ca extraction. On the other hand, Eu could be selectively separated by Cyanex272 (Eu extraction (%) 99.1) without Co and Ca extraction at pH 2~3. Therefore, the extraction method can be tailored according to the target radionuclides present in the wastewater and be selectively applied to the overall treatment process. By extracting radioactive Co and Eu from acidic wastewater to below the discharge criteria, treated wastewater could be regarded as non-radioactive industrial waste, to be economically and easily handled. Moreover, it may be possible to reuse separated Co and Eu for research and industrial applications by realizing waste valorization.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 1; 123--126
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of D2EHPA for manganese(II) and nickel(II) separation by solvent extraction and polymer inclusion membranes
Autorzy:
Pośpiech, B.
Walkowiak, W.
Ulewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/347057.pdf
Data publikacji:
2004
Wydawca:
Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
Tematy:
manganese(II)
nickel(II)
D2EHPA
solvent extraction
polymer inclusion membrane
Opis:
The separation of manganese(II) and nickel(II) from chloride solution with di-(2-ethylhexyl) phosphoric acid (D2EHPA) was studied. The metal ions were separated using solvent extraction and transport through polymer inclusion membranes (PIMs) with D2EHPA as the extractant/ion carrier. The aqueous solutions consisted of 0.010 M manganese(II) and nickel(II) chlorides. The influence of aqueous phase pH on the separation of Mn(II) and Ni(II) has been investigated. Mn(II) can be selectively removed from chloride solution at equilibrium pH equal to 2.90. From the organic phase, Mn(II) was stripped with 0.1-2.0 M aqueous solutions of HCl, H2SO4 and HNO3. The competitive transport of Mn(II) and Ni(II) through PIMs was studied as a function of the ion carrier and plasticizer concentration in the membrane.
Źródło:
Ars Separatoria Acta; 2004, 3; 72-80
1731-6340
Pojawia się w:
Ars Separatoria Acta
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badanie procesu ekstrakcji wysokoaromatycznych surowców naftowych z zastosowaniem współrozpuszczalnika
Study on extraction process of high aromatic oils using co-solven
Autorzy:
Antosz, Artur
Ptak, Stefan
Powiązania:
https://bibliotekanauki.pl/articles/2143439.pdf
Data publikacji:
2021
Wydawca:
Instytut Nafty i Gazu - Państwowy Instytut Badawczy
Tematy:
ekstrakcja rozpuszczalnikowa
współrozpuszczalnik
plastyfikator
solvent extraction
co-solvent
plasticizer
Opis:
Obecnie jedną z najpopularniejszych metod wytwarzania plastyfikatora TDAE do kauczuków i gumy jest metoda bazująca na procesie rafinacji ekstraktów naftowych furfurolem. Proces ten zapewnia obniżenie w ekstraktach zawartości rakotwórczych wielopierścieniowych węglowodorów aromatycznych (WWA) do wymaganego poziomu. Technologia produkcji plastyfikatora sprawiała liczne problemy w warunkach przemysłowych związane z koniecznością prowadzenia procesu w niskich temperaturach, co powoduje utrudnienia w przebiegu wymiany masy w kolumnie ekstrakcyjnej w związku z wysoką lepkością przerabianego surowca w niskich temperaturach. Konieczność użycia niższych temperatur w trakcie procesu rafinacji wysokoaromatycznych frakcji wynika z ich charakterystyki rozpuszczalności w furfurolu, oznaczanej na podstawie krytycznej temperatury rozpuszczalności. W artykule zostały przedstawione badania nad wpływem zastosowania współrozpuszczalnika w procesie rafinacji wysokoaromatycznych surowców naftowych na jakość uzyskanych plastyfikatorów oraz możliwość prowadzenia procesu w wyższych temperaturach, zbliżonych do temperatur pracy kolumny podczas ekstrakcji klasycznych frakcji próżniowych. Potwierdzono korzystny wpływ dodatku współrozpuszczalnika na wydajność procesu oraz zwiększenie selektywności ekstrakcji. Badania nad procesem ekstrakcji rozpuszczalnikowej prowadzono na dwóch surowcach charakteryzujących się różnymi lepkościami przy zastosowaniu jako współrozpuszczalnika formamidu w stężeniach 5% i 7,5%. Wykonano również proces ekstrakcji bez współudziału formamidu, służący jako proces odniesienia dla porównania wydajności i jakości otrzymanych rafinatów. W badaniach technologicznych wykorzystano stanowiska wielkolaboratoryjne umożliwiające prowadzenie procesów rafinacji rozpuszczalnikowej, symulującej proces przemysłowy stosowany na bloku olejowym w rafinerii naftowej. W próbach rafinacji rozpuszczalnikowej poszczególnych ekstraktów zastosowano parametry technologiczne dostosowane do wyznaczonych temperatur krytycznych rozpuszczalności dla danych układów. Uzyskane wyniki temperatur krytycznych wskazują na istotny wpływ udziału współrozpuszczalnika na oznaczony wynik temperatury krytycznej dla danego układu. Próbki otrzymanych rafinatów zostały poddane ocenie właściwości fizykochemicznych w zakresie wymaganym dla plastyfikatora TDAE. Wraz z większym udziałem formamidu poprawie ulegały oznaczane w rafinatach kluczowe właściwości fizykochemiczne z punktu widzenia wymagań wobec plastyfikatorów, wzrastała lepkość, gęstość, współczynnik załamania światła oraz zawartość węgla w strukturach CA. Wszystkie procesy rafinacji pozwoliły na obniżenie zawartości WWA poniżej 3% (m/m). Najlepsze efekty w tym zakresie dał proces R1390 przy udziale współrozpuszczalnika w ilości 7,5% (m/m), ponieważ obniżając poziom WWA, nie spowodował gwałtowanego spadku zawartości atomów węgla w strukturach aromatycznych. Przeprowadzone badania pozwoliły na potwierdzenie korzystnego wpływu zastosowania współrozpuszczalnika w procesie rafinacji wysokoaromatycznych surowców naftowych na jakość uzyskanych plastyfikatorów TDAE. Rafinacja z udziałem współrozpuszczalnika zgodnie z założoną koncepcją projektu pozwoliła na wyeliminowanie problemów związanych z prowadzeniem tego procesu w niskich temperaturach. Zaobserwowano również duży wpływ dodatku współrozpuszczalnika na wydajność uzyskiwanych plastyfikatorów w trakcie ekstrakcji rozpuszczalnikowej.
Currently, one of the most popular methods of producing TDAE plasticizer for latex and rubber is the method based on furfural refining of petroleum extracts. This process ensures reduction of carcinogenic polycyclic aromatic hydrocarbons (PAHs) content in extracts to the required level. The technology of plasticizer production caused numerous problems in industrial conditions related to the necessity of conducting the process at low temperatures, which impedes the mass exchange process in the extraction column due to high viscosity of the processed raw material at low temperatures. The necessity of using lower temperatures during the refining process of highly aromatic fractions results from their solubility characteristics in furfural determined on the basis of the critical solubility temperature. The paper presents research on the influence of the use of co-solvent in the refining process of highly aromatic crude oils on the quality of plasticizers obtained and the possibility of conducting the process at higher temperatures, similar to those of the column during extraction of classical vacuum fractions. The beneficial effect of co-solvent addition on process efficiency and increased extraction selectivity was confirmed. Studies on the solvent extraction process were conducted on two raw materials characterized by different viscosities, using formamide as a cosolvent at concentrations of 5% and 7.5%. An extraction process without formamide co-solvent was also performed and served as a reference process to compare the yield and quality of the obtained raffinates. In the technological studies, large-scale laboratory workstations were used to carry out solvent refining processes, simulating the industrial process used in an oil block in a petroleum refinery. For solvent refining of individual extracts, technological parameters adjusted to the determined critical temperatures of solubility for given systems were used. The obtained critical temperature results indicate a significant influence of the co-solvent proportion on the determined critical temperature result for a given system. The samples of the obtained raffinates were subjected to physicochemical properties evaluation within the range required for the TDAE plasticizer. With a higher proportion of formamide, the key physicochemical properties determined in the raffinates from the point of view of plasticizer requirements improved. Viscosity, density, refractive index and carbon content in CA structures increased. All refining processes allowed to decrease PAH content below 3% (m/m). The R1390 process with 7.5% (m/m) of co- -solvent gave the best results in this respect as it did not cause a sharp decrease in carbon atoms content in aromatic structures while lowering PAHs level. The studies carried out confirmed the beneficial influence of the co-solvent application in the refining process of highly aromatic petroleum raw materials on the quality of the obtained TDAE plasticizers. The refining process with the use of co-solvent allowed, in line with the project concept, to eliminate the problems associated with conducting the process at low temperatures. A considerable effect of cosolvent addition on the yield of obtained plasticizers during solvent extraction was also observed.
Źródło:
Nafta-Gaz; 2021, 77, 10; 692-703
0867-8871
Pojawia się w:
Nafta-Gaz
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of solvents containing CyMe4-BTPhen in selected cyclohexanone-based diluents after irradiation by accelerated electrons
Autorzy:
Distler, P.
Kondé, J.
John, J.
Hájková, Z.
Švehla, J.
Grüner, B.
Powiązania:
https://bibliotekanauki.pl/articles/971488.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
accelerated electrons
CyMe4-BTPhen
irradiation
radiation stability
solvent extraction
Opis:
Radiation stability of CyMe4-BTPhen was examined in systems with three selected cyclohexanone-based diluents. Accelerated electrons were used as a source of ionizing radiation. The CyMe4-BTPhen radiation degradation identifi cation and characterization of the degradation products were performed by high performance liquid chromatography (HPLC) and mass spectrometry (MS) analyses. Residual concentrations of tested ligand were determined. Moreover, extraction properties of the solvents irradiated at two different doses were compared with the extraction properties of non-irradiated solvents to estimate the influence of the presence of degradation products in the organic phase.
Źródło:
Nukleonika; 2015, 60, No. 4, part 2; 885-891
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Copper recovery from chalcopyrite concentrate acid leach solutions by Acorga M5397
Autorzy:
El Amari, K.
Jdid, E.-A.
Blazy, P.
Powiązania:
https://bibliotekanauki.pl/articles/110601.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
copper solvent extraction
solvent extraction selectivity
nitro-fluorosilic acid
AcorgaM5397
Opis:
Chalcopyrite concentrate from Hajar Mine, Morocco, was leached with nitro-fluosilicic acid leach solution. The pregnant leach solution obtained contained 19.3 g/dm3 Cu, 18.1 g/dm3 Fe, 4.5 g/dm3 Zn and 0.03 g/dm3 Pb. Copper recovery from this pregnant leach liquor was performed by solvent extrac-tion using Acorga M5397 diluted in Escaid 110. McCabe–Thiele distribution isotherms showed that at pH 1.7 complete and selective copper extraction can be achieved with φo/φa =1.5/1 in 3 stages of extraction. Stripping of the loaded copper by treating the organic phases by a fresh sulphuric acid solution was easily realized.
Źródło:
Physicochemical Problems of Mineral Processing; 2013, 49, 1; 329-339
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of formation constants of uranyl(VI) complexes with a hydrophilic SO3-Ph-BTP ligand, using liquid-liquid extraction
Autorzy:
Steczek, L.
Narbutt, J.
Charbonnel, M. -C.
Moisy, P.
Powiązania:
https://bibliotekanauki.pl/articles/147774.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
uranyl ion
hydrophilic poly-N-dentate ligands
complexes
solvent extraction
stripping
formation constant
Opis:
Complex formation between uranyl ion, UO2 2+, and a hydrophilic anionic form of SO3-Ph-BTP4– ligand, L4–, in water was studied by liquid-liquid extraction experiments performed over a range of the ligand and HNO3 concentrations in the aqueous phase, at a constant concentration of nitrate anions at 25°C . The competition for UO2 2+ ions between the lipophilic TODGA extractant and the hydrophilic L4– ligand leads to the decrease in the uranyl distribution ratios, D, with an increasing L4– concentration. The model of the solvent extraction process used accounts – apart from uranyl complexation by TODGA and SO3-Ph-BTP4– – also for uranyl complexation by nitrates and for the decrease in the concentration of the free L4– ligand in the aqueous phase, due to its protonation, bonding in the uranyl complex and the distribution between the two liquid phases. The unusually strong dependence of the D values on the acidity, found in the experiment, could hardly be explained as due to L4– protonation merely. Three hypotheses were experimentally tested, striving to interpret the data in terms of additional extraction to the organic phase of ion associates of protonated TODGA cation with either partly protonated anionic L4– ligands or anionic UO2 2+ complexes with NO3 – or L4–. None of them has been confi rmed. The analysis of the results, based on the formal correction of free ligand concentrations, points to the formation of 1 : 1 and 1 : 2 uranyl – SO3-Ph-BTP complexes in the aqueous phase. The conditional formation constant of the 1:1 complex has been determined, logβL,1 = 2.95 ± 0.15.
Źródło:
Nukleonika; 2015, 60, No. 4, part 2; 821-827
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of the Chalmers Grouped Actinide Extraction Process
Autorzy:
Halleröd, J.
Ekberg, C.
Löfström-Engdahl, E.
Aneheim, E.
Powiązania:
https://bibliotekanauki.pl/articles/146113.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
BTBP-ligands
DEHBA
GANEX
organic diluents
TBP
solvent extraction
Opis:
Several solvents for Grouped ActiNide EXtraction (GANEX) processes have been investigated at Chalmers University of Technology in recent years. Four different GANEX solvents; cyclo-GANEX (CyMe4- -BTBP, 30 vol.% tri-butyl phosphate (TBP) and cyclohexanone), DEHBA-GANEX (CyMe4-BTBP, 20 vol.% N,N-di-2(ethylhexyl) butyramide (DEHBA) and cyclohexanone), hexanol-GANEX (CyMe4-BTBP, 30 vol.% TBP and hexanol) and FS-13-GANEX (CyMe4-BTBP, 30 vol.% TBP and phenyl trifl uoromethyl sulfone (FS-13)) have been studied and the results are discussed and compared in this work. The cyclohexanone based solvents show fast and high extraction of the actinides but a somewhat poor diluent stability in contact with the acidic aqueous phase. FS-13-GANEX display high separation factors between the actinides and lanthanides and a good radiolytic and hydrolytic stability. However, the distribution ratios of the actinides are lower, compared to the cyclohexanone based solvents. The hexanol-GANEX is a cheap solvent system using a rather stable diluent but the actinide extraction is, however, comparatively low.
Źródło:
Nukleonika; 2015, 60, No. 4, part 2; 829-835
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Direct measurements of reaction time for extractive processes
Autorzy:
Gotfryd, L.
Becker, K.
Pietek, G.
Szołomicki, Z.
Piwowonska, J.
Powiązania:
https://bibliotekanauki.pl/articles/109772.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
reaction time
solvent extraction
viscosity
stripping rate
sulphuric acid
Opis:
Extraction times for selected metal cations (Mg2+, Al3+, Zn2+, Cd2+, Cu2+, Ni2+, Co2+, Mn2+, Fe2+ and Fe3+) have been measured using cation-exchanging extractants - Versatic 10 (neodecanoic acid), DEHPA (bis(2-ethylhexyl)phosphoric acid) and Cyanex 272 (bis(2,4,4-trimetylpentyl)phosphinic acid). Data was collected directly by measuring and recording pH of the two phase reaction mixture with maintaining continuity of the aqueous phase. Similarly, the stripping rate of selected cations (Mg2+, Al3+, Zn2+, Cu2+, Ni2+, Co2+) in a sulphuric acid solution was measured. Viscosities of organic phases, saturated with cations, were measured before their stripping. Additionally, the extraction dependence of Mg2+, Al3+, Fe2+ and Fe3+ on pH was measured using Versatic 10 at various concentrations (7.5, 15 and 30 %).
Źródło:
Physicochemical Problems of Mineral Processing; 2016, 52, 2; 909-919
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic of Components Leachate from Experimental Fertilizers in Leaching Test
Autorzy:
Ciesielczuk, T.
Poluszyńska, J.
Szewczyk, A.
Rosik-Dulewska, C.
Sporek, M.
Powiązania:
https://bibliotekanauki.pl/articles/124470.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
nutrients
leaching
slow-release fertilisers
solvent extraction spent coffee grounds
sustainable fertilisation
Opis:
Organic matter contained in the waste of food industry or occurring in the households, in the absence of contamination with other kind of waste, may be used to create a “fertiliser”, which could be even reused in the organic production of arable crops. Particular attention is drawn to the fertilisers which may be applied in the case of amateur cultivation of pot plants and in the allotment gardens. The paper presents the results of research regarding the dynamics of the release of nutrients from tablets created with the help of encapsulation of the mixture manufactured from solvent extraction waste of coffee (SCG), modified by the ash obtained from low temperature burning of biomass. In this study, the mixture was determined as a fertilizer. Collagen, polyvinyl acetate, polyvinyl alcohol, shellac as well as sodium water glass have been applied as testing membranes in order to slow down the elution of the components from a fertilizer into solution. The durability tests have been carried out according to PN-EN-13266 standard over 118 days at the temperature of 25°C. The obtained results indicate significant differentiation with regard to the leaching of nutrients and organic matter from the tablets depending on the applied membrane. Strong inhibition concerning leaching of the components through membranes and from shellac and polyvinyl acetate has been observed. The remaining membranes did not inhibit the leaching of nutrients in the long-lasting manner; however, even they may be applied in the agricultural practice.
Źródło:
Journal of Ecological Engineering; 2018, 19, 2; 194-203
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of coexisting sodium ion extractive separation of metal ions with calix[4]arene tetracarboxylic acid
Autorzy:
Ohto, K.
Shioya, A.
Higuchi, H.
Oshima, T.
Inoue, K.
Powiązania:
https://bibliotekanauki.pl/articles/346949.pdf
Data publikacji:
2002
Wydawca:
Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
Tematy:
calix[4]arene
metal separation
solvent extraction
coexisting sodium ion
Opis:
Solvent extraction of metal ions with calix[4]arene tetracarboxylic acid has been carried out to elucidate effect of coexisting sodium ion. Extraction of metal ions examined, Pb(II), Fe(III), Cu(II), Zn(II), Ni(II), and Co(II), is enhanced by the addition of sodium ion. The enhancement degree of the metal extraction is not necessarily in proportion to the added sodium concentration. The addition of trace amount of sodium ion is necessary to specifically complex for calix[4]arene tetracarboxylic acid and to enhance the extraction ability. However, the addition of excessive amounts of sodium suppresses the extraction of other metal ions, since they act as a competitive ion with other metal ions; The relation between extractive pH1/2 of metal ions and sodium concentration is shown. Mutual separation of metal ions by using additional sodium ion is also investigated. Although complete mutual separation of three metal ions, Pb(II), Cu(II), and Zn(II), has not been achieved, the possibility that the sodium addition will enhance not only the extraction ability but also the separation efficiency is suggested.
Źródło:
Ars Separatoria Acta; 2002, 1; 61-70
1731-6340
Pojawia się w:
Ars Separatoria Acta
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Extraction of rubidium and cesium from brine solutions using a room temperature ionic liquid system containing 18-crown-6
Autorzy:
Huang, D.
Zheng, H.
Liu, Z.
Bao, A.
Li, B.
Powiązania:
https://bibliotekanauki.pl/articles/779994.pdf
Data publikacji:
2018
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
Rubidium
Cesium
Ionic liquid
18-crown-6
Solvent extraction
Opis:
Application of 1-butyl-3-metyhlimidazaolium hexafl uorophosphate ([C4mim][PF6 ]), in the extraction of rubidium and cesium from brine solutions using 1,4,7,10,13,16-hexaoxacyclooctadecane (18C6) as extractant was investigated. Parameters that affect the extraction including pH of aqueous phase, equilibration time, dosage of the ionic liquid, phase ratio, concentration of 18C6 were studied. Under the optimal conditions, the single extraction effi ciency of rubidium ions and cesium ions were up 84.11% and 94.99%, respectively. The stripping of alkali metal ions from the loaded organic phase with different stripping agents and concentrations were also investigated. The initial value of the K/Cs and K/Rb ratios were 93.0 and 104.3, respectively, which have dropped 91.21% and 88.01%, respectively, after the extraction and stripping experiments. It was taken a big step in the separation and enrichment of cesium (rubidium) ion and potassium ion. The extraction mechanism was revealed most likely to be a cation exchange mode in this system.
Źródło:
Polish Journal of Chemical Technology; 2018, 20, 2; 40-46
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Extraction of rubidium ion from brine solutions by dicyclohexano-18-crown-6 / ionic liquid system
Autorzy:
Huang, Dongfang
Ma, Guixiang
Lv, Peng
Zhou, Quanbao
Powiązania:
https://bibliotekanauki.pl/articles/2204138.pdf
Data publikacji:
2023
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
Rubidium
Ionic liquid
Dicyclohexano-18-crown-6
Solvent extraction
Opis:
Separation among rubidium and potassium ions from salt lake brines remains challenging. In this work, a typical room temperature ionic liquid 1-ethyl-3-metyhlimidazaolium bis(trifluoromethylsulfonyl)imide ([C2mim+][NTf2-]) was used as diluent and synergistic extractant, dicyclohexano-18-crown-6 (DCH18C6) was used as extractant to extract rubidium ions from brine solutions which contain high concentrations of potassium ions was investigated. Under the optimal conditions, the single extraction efficiency of rubidium ions was up 93.63%. The thermodynamic parameters of the rubidium ion extraction were obtained. Based on the slope analysis method, the extracted species in the organic phase were ascertained as 1:1 complex. UV-visible has been performed to investigate the ion concentration of ionic liquid before and after the interaction of metal ions and ligands. Rubidium ions in [Rb · DCH18C6]+ complex were stripped by 2.5 mol · L–1 NH4NO3. The extraction system offers high efficiency, simplicity and environmentally friendly application prospect to separate rubidium from brine solutions.
Źródło:
Polish Journal of Chemical Technology; 2023, 25, 1; 61--68
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Extraction properties of tetraheptylresorcin[4]arenes in relation to Cr(III) ions
Autorzy:
Konczyk, J.
Miroshnychenko, S.
Kozlowski, C.
Powiązania:
https://bibliotekanauki.pl/articles/109751.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
solvent extraction
resorcin[4]arenes
chromium(III)
cadmium(II)
zinc ions
Opis:
Resorcin[4]arene-based ligand bearing four heptyl chains at the lower rim of the molecule was prepared and modified by four tetradietoxyphosphoryl groups in the upper rim. The compounds obtained were characterized by NMR spectroscopy and their extractability toward chromium(III) ions was studied. The influence of process parameters such as the pH of aqueous phase, agitation time and also extractant’s structure and concentration on efficiency of Cr(III) ions solvent extraction is presented. The highest yield of Cr(III) solvent extraction was obtained for two-hour agitation time of 5.010−4 M metal solution of pH 5.0 and 5.010−3 M chloroform solution of the tetradietoxyphosphorylated derivative of heptyl-resorcin[4]arene. Under optimal conditions, competitive solvent extraction of Cr(III), Zn(II), and Cd(II) ions was performed and separation factor values were established as 77.0 and 24.9 for Cr(III)/Cd(II) and Cr(III)/Zn(II) ions pairs, respectively. The stoichiometry of formed metal-ligand complexes 1:1 was found by classical slope analysis method.
Źródło:
Physicochemical Problems of Mineral Processing; 2016, 52, 2; 835-844
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydrometallurgical treatment of hazardous copper Cottrell dusts to recover copper
Autorzy:
Alguacil, F. J.
Regel-Rosocka, M.
Powiązania:
https://bibliotekanauki.pl/articles/110814.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
Cu solid wastes
leaching
solvent extraction
cementation
Opis:
Copper flue dusts, or copper Cottrell dusts, from three types of copper smelting furnaces were leached with different ammonia-based reagents (ammonium chloride, ammonium carbonate and aqueous ammonia solutions) to dissolve the oxidised copper species via the formation of copper-ammonia complexes, so that most of the copper-accompanying metals, especially iron, remained in the solid residue. Such copper-bearing dusts are not only valuable secondary source of copper but also are considered as hazardous materials and cannot be dumped as such. Therefore, two procedures for copper dust treatment are proposed, one of them includes ammonium-based leaching, liquid-liquid extraction with LIX 860 (aldoxime), LIX 84 (ketoxime) or LIX 54 (β-diketone) and electrowinning to grade A copper cathode. The other one covers also ammonium-based leaching followed by cementation with zinc to copper cement as a final product.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 3; 771-780
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
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