The Clusius-Dickel Thermal Diffusion Column – 50 Years after its Invention

Müller, G.; Vasaru, G.

doi:10.1080/10256018808624027

Cited by 12 publications

(10 citation statements)

References 34 publications

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“…It should be noted that at a research of the Taribani oil ten compounds have been detected in oil for the first time: tricyclo [5.2.2.0 3,7 ]undecan (C 11 H 18 , ); 1-n-propyladamantane (C 13 H 22 ), 1-ethyl-2methyl-adamantane (C 13 H 22 ), metyltetracyclo[6,3,1,1 6.10 0 2.6 ]tridecan (C14H22); 1-methyl-and 3methyl-diamantanes (C 15 H 22 ), tetracyclo[7.3.1.0 2,7 ,1 7,11 ]tetradecan (C 14 H 22 ) and its homological range of tetracyclo[7.3.1.0 2,7 ,1 7,11 ]tetradecan up to hexamethyl-substituted (C 15 H 24 -C 20 H 34 ).…”

Section: Discussionmentioning

confidence: 99%

“…The concentrate preparation included the following steps:  Distillation collecting two consecutive fractions 200-250°C and 250-350°C;  Dearomatization of distillates by silica gel adsorption chromatography;  Three-stage thermal diffusion separation [4][5][6] of isoalkanes and cycloalkanes on the Mel polder's fractionating column [7] obtaining ten thermodiffusion fractions; fractions IX and X had almost identical content of polycyclic saturated hydrocarbons and have been united, the fraction VIII was studied separately;…”

Section: Preparation Of Cycloalkane Concentratesmentioning

confidence: 99%

“…It should be noted that when studying Taribani oil [1] ten compounds have been detected in oil for the first time: tricyclo[5.2.2.0 3,7 ]undecan (C 11 H 18 , peak 10), 1-n-propyladamantane (C 13 H 22 , peak 33), 1-ethyl-2-methyl-adamantane (C 13 H 22 , peak 21, Figure 1), metyltetracyclo [6,3,1,1 6.10 0 2.6 ]tridecan (C14H22, peak 18); 1-methyl-and 3-methyl-diamantanes (C 15 H 22 , peaks 26 and 29, respectively), tetracyclo[7.3.1.0 2,7 ,1 7,11 ]tetradecan (C 14 H 22 , peak 19) and its derivatives up to hexamethyl-substituted analogs (C 15 H 24 -C 20 H 34 , peaks 24,27,28,30,32 and 33 Figure 2).…”

Section: Gas Chromatography-mass Spectrometry Analysismentioning

confidence: 99%

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Polycycloalcane Hydrocarbons in Taribani Oil

Khetsuriani¹,

Topuria²,

Chkhaidze³

et al. 2018

RS Global - World Science

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For the purpose of extraction and identification of cyclic alkane hydrocarbons in oil from the Taribani field, Georgia, concentrates isolated from 200-350oC fractions have been studied. The concentrate preparation included the following steps: (a) distillation of a crude oil, (b) dearomatization of distillates by silica gel, (c) three-stage thermal diffusion separation of isoalkanes and cycloalkanes, and (d) thiourea adduction. Ten thermal diffusion fractions were obtained. A mixture of the IX and X fractions and separately the VIII fraction were studied. The extracts from these fractions with thiourea were studied as well. Composition of concentrates has been determined by the gas chromatography – mass spectrometry (GC-MS) method.The main components of the VIII thermodiffusion fraction were C11- C22 isoprenoid alkanes. Among them the predominant were pristane C19 and the phytane C20, the well-known biomarkers of oil. In the VIII thermodiffusion faction including dimethyl-, trimethyl-, tetramethyl-, ethyl-, methyl-ethyl-, diethyl-, propyl, methyl-propyl adamantanes, were identified.

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Section: Discussionmentioning

confidence: 99%

Section: Preparation Of Cycloalkane Concentratesmentioning

confidence: 99%

Section: Gas Chromatography-mass Spectrometry Analysismentioning

confidence: 99%

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Polycycloalcane Hydrocarbons in Taribani Oil

Khetsuriani¹,

Topuria²,

Chkhaidze³

et al. 2018

RS Global - World Science

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“…Mahata and co-authors 18 also reported α 18 (CO 2 /O 2 ) < 1, ranging from 0.998128 to 0.99463, even at 680 C. A possible explanation for the discrepancy between the calculation and the experimental results is isotopic separation due to thermal diffusion. [59][60][61][62][63][64] In this study, one end of the reactor is positioned inside an oven at a specific temperature (500 C to 1200 C), whereas the other end is at room temperature (see Figure 1). The hot zone of the reactor is only 35 cm 3 in volume and approximately half that is outside the oven (Figure 1).…”

Section: Scale Difference Between O 2 and Comentioning

confidence: 99%

Temperature dependence of isotopic fractionation in the CO₂‐O₂ isotope exchange reaction

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Janssen

et al. 2022

Rapid Comm Mass Spectrometry

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Rationale: Oxygen isotope exchange between O 2 and CO 2 in the presence of heated platinum (Pt) is an established technique for determining the δ 17 O value of CO 2 . However, there is not yet a consensus on the associated fractionation factors at the steady state. Methods:We determined experimentally the steady-state α 17 and α 18 fractionation factors for Pt-catalyzed CO 2 -O 2 oxygen isotope exchange at temperatures ranging from 500 to 1200 C. For comparison, the theoretical α 18 equilibrium exchange values reported by Richet et al. (1997) have been updated using the direct sum method for CO 2 and the corresponding α 17 values were determined. Finally, we examined whether the steady-state fractionation factors depend on the isotopic composition of the reactants, by using CO 2 and O 2 differing in δ 18 O value from À66 ‰ to +4 ‰. Results:The experimentally determined steady-state fractionation factors α 17 and α 18 are lower than those obtained from the updated theoretical calculations (of CO 2 -O 2 isotope exchange under equilibrium conditions) by 0.0024 ± 0.0001 and 0.0048 ± 0.0002, respectively. The offset is not due to scale incompatibilities between isotope measurements of O 2 and CO 2 nor to the neglect of non-Born-Oppenheimer effects in the calculations. There is a crossover temperature at which enrichment in the minor isotopes switches from CO 2 to O 2 . The direct sum evaluation yields a θ value of $0.54, i.e. higher than the canonical range maximum for a mass-dependent fractionation process.Conclusions: Updated theoretical values of α 18 for equilibrium isotope exchange are lower than those derived from previous work by Richet et al. (1997). The direct sum evaluation for CO 2 yields θ values higher than the canonical range maximum for mass-dependent fractionation processes. This demonstrates the need to include anharmonic effects in the calculation and definition of mass-dependent fractionation processes for poly-atomic molecules. The discrepancy between the theory and the experimental α 17 and α 18 values may be due to thermal diffusion associated with the temperature gradient in the reactor.

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“…Considering these values, a magnetic separation of ions could be deemed an Icarian endeavor. Nevertheless, attempts of rare earth ion separation in a magnetically modified Clusius-Dickel thermal diffusion column 100 , 101 were reported by Ida and Walter Noddack in the 1950s. 7 − 9 After a 50 year hiatus, interest in the effects of magnetic field gradients on ionic solutions has been revived.…”

Section: Introductionmentioning

confidence: 99%

Neutron Imaging of Paramagnetic Ions: Electrosorption by Carbon Aerogels and Macroscopic Magnetic Forces

et al. 2021

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The electrosorption of Gd 3+ ions from an aqueous 70 mM Gd(NO 3 ) 3 solution in monolithic carbon aerogel electrodes was recorded by dynamic neutron imaging. The aerogels have a bimodal pore size distribution consisting of macropores and mesopores centered at 115 and 15 nm, respectively. After the uptake of Gd 3+ ions by the negatively charged surface of the porous structure, an inhomogeneous magnetic field was applied to the system of discharging electrodes. This led to a convective flow and confinement of Gd(NO 3 ) 3 solution in the magnetic field gradient. Thus, a way to desalt and capture paramagnetic ions from an initially homogeneous solution is established.

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The Clusius-Dickel Thermal Diffusion Column – 50 Years after its Invention

Cited by 12 publications

References 34 publications

Polycycloalcane Hydrocarbons in Taribani Oil

Polycycloalcane Hydrocarbons in Taribani Oil

Temperature dependence of isotopic fractionation in the CO₂‐O₂ isotope exchange reaction

Neutron Imaging of Paramagnetic Ions: Electrosorption by Carbon Aerogels and Macroscopic Magnetic Forces

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The Clusius-Dickel Thermal Diffusion Column – 50 Years after its Invention

Cited by 12 publications

References 34 publications

Polycycloalcane Hydrocarbons in Taribani Oil

Polycycloalcane Hydrocarbons in Taribani Oil

Temperature dependence of isotopic fractionation in the CO2‐O2 isotope exchange reaction

Neutron Imaging of Paramagnetic Ions: Electrosorption by Carbon Aerogels and Macroscopic Magnetic Forces

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Temperature dependence of isotopic fractionation in the CO₂‐O₂ isotope exchange reaction