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Wyświetlanie 1-15 z 20
Tytuł:
DFT study of coadsorption of fatty acid and kerosene on fluorapatite (001) surface
Autorzy:
Du, Weifan
Li, Xianbo
Zhang, Qin
Powiązania:
https://bibliotekanauki.pl/articles/2200343.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
fluorapatite surface
fatty acid
kerosene
coadsorption
DFT
Opis:
The adsorption of fatty acid, kerosene and fatty acid-kerosene on fluorapatite (001) surface were investigated by density functional theory (DFT) calculations. The results showed that the single fatty acid could form stable chemisorption on fluorapatite (001) surface by the O of fatty acids bonding with Ca1 site. The single kerosene could not be stably adsorbed on fluorapatite (001) surface because the H of kerosene did not form hydrogen bond with the O of PO43- on (001) surface (Osurf). For the coadsorption conformation, the chemisorption of fatty acid-kerosene on fluorapatite (001) surface was contributed by the interaction between O of fatty acids and Ca1, the H of kerosene did not bond with the Osurf, but the carbon chain length of kerosene has a large influence on the coadsorption. Compared with the coadsorption of fatty acid-decane, the adsorption of butyric acid-tetradecane and octanoic acid-tetradecane on fluorapatite (001) surface have greater adsorption energies and overlapping region of DOS between O 2p and Ca 4d, indicating that there is a synergistic effect between fatty acid and tetradecane. Meanwhile, the collaborative effects exist between the molecules of fatty acids. The interpenetrating adsorption of fatty acid and kerosene on the fluorapatite surface could improve the adsorption strength and density. The flotation test further confirmed that the single kerosene could not collect fluorapatite, but it could be collected by the single fatty acid. Besides, the synergistic effect between fatty acid and kerosene could increase the flotation recovery of fluorapatite.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 1; art. no. 161890
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synergistic effect of a mixture of dodecylamine and kerosene on separation of magnetite ore
Autorzy:
Liu, A.
Fan, M.-Q.
Li, Z.-H.
Powiązania:
https://bibliotekanauki.pl/articles/109849.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
DDA-kerosene
magnetite ore
quartz
flotation
Opis:
In this study, it was discovered that a mixture of dodecylamine (DDA)-kerosene demonstrated a stronger collecting ability for pure quartz and higher selectivity for magnetite ore. The relationship between the DDA-kerosene composition and mineral flotation performance on reverse flotation of magnetite ore was investigated. The results showed that floatability of the floating material increased when the DDA consumption increased. Specifically, during flotation, the fine particles (-0.074 mm fraction) selectively floated with DDA-kerosene. The difficult to float coarser particles (+0.074 mm fraction) with high content of quartz, required higher DDA dosage. However, higher DDA input during the flotation process did not necessarily yield better outcomes. The best results were obtained for 40/60 amine-to-oil ratio, as the quartz floated markedly with smaller magnetite loss and the flotation behavior was superior to pure DDA. Magnetite concentrates with 1.83% SiO2 and 71.04% Fe were produced using 120 g/Mg of DDA-kerosene (WDDA=40%).
Źródło:
Physicochemical Problems of Mineral Processing; 2016, 52, 2; 647-661
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena właściwości smarnych wybranych paliw pochodzenia roślinnego i naftowego
Assessment of lubricating properties of selected vegetable and kerosene fuels
Autorzy:
Batko, B.
Dobek, T. K.
Powiązania:
https://bibliotekanauki.pl/articles/291277.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Inżynierii Rolniczej
Tematy:
paliwo
biopaliwo
paliwo naftowe
smarność
vegetable fuel
kerosene fuel
lubricating ability
Opis:
W pracy przedstawiono wyniki badań smarności wybranych paliw naftowych oraz estrów metylowych oleju rzepakowego i rafinowanego oleju roślinnego. Właściwości smarne określono na podstawie oporów tarcia występujących w skojarzeniu tarciowym oraz temperatury paliwa. Z badań wynika, że paliwa pochodzenia roślinnego charakteryzują się lepszymi właściwościami smarnymi od paliw naftowych.
The paper presents the results of testing the lubricating properties of selected kerosene fuels and methyl esters of rape oil and refined vegetable oil. The lubricating properties were determined on the basis of frictional resistance occurring during friction test, and fuel temperature. It has been found that vegetable fuels are characterized by better lubricating properties compared to kerosene fuels.
Źródło:
Inżynieria Rolnicza; 2008, R. 12, nr 4(102), 4(102); 69-74
1429-7264
Pojawia się w:
Inżynieria Rolnicza
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polycyclic Aromatic Hydrocarbon Accumulation in Meats Singed with Kerosene and Waste Tyres: A Case for Public Health Concern in Nigeria
Autorzy:
Okareh, Oladapo T.
Oshinloye, Oluwatoyin A.
Abiodun, Dada
Powiązania:
https://bibliotekanauki.pl/articles/1840776.pdf
Data publikacji:
2021
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Singeing torch
Meat
Waste Tyres
Kerosene
Poly Aromatic Hydrocarbon (PAH)
Opis:
Singeing is a common post slaughtering process of livestock and this has been associated with the introduction of high level of Polycyclic Aromatic Hydrocarbon (PAH) in the meats. There is dearth of information on alternative singeing technology for safe meat. Therefore, this study is aimed at proffering an alternative method for singeing livestock carcass as a post-slaughtering process to reduce accumulation of PAH in meat. An experimental study, involving the use of a singeing device (singeing torch) sourced locally was conducted. Singeing was carried out on a sacrificed goat using conventional methods and the Singeing Torch (ST). Five grams of meat samples singed with kerosene, tyres and the ST were collected from two abattoirs and observed for physical qualities. The physicochemical properties such as pH and PAH were determined using standard procedures. Results were compared with International Agency for Research in Cancer guidelines. Data were analyzed using descriptive statistics and ANOVA at 5% level of significance. Bright appearances with red coloration for ST singed meat while black patches and dull appearances were observed on meat singed with kerosene and tyres respectively. ST singed meat showed a better olfactory quality, a more neutral PH value and PAH of 7.3 and 3.30 (n/ng), while kerosene and tyre singed meat showed 6.8 pH value, 4.20 (n/ng) and 6.61 (n/ng) respectively with mean of 0.194±0.56, 0.248±0.94 and 0.389±1.21 respectively. The principal PAH compounds in ST meat identified were 1-Methylnaphthalene, 2-Methylnaphthalene, Acenaphthene, Pyrene and Benz(a)anthracene. This study indicates that meat singed with ST had lower PAH contents and better physical quality. The use of device and method that generates no chemical contaminants such as the ST should be encouraged for the singeing process of livestock carcasses as a strategy for the control of chemical contaminants of meat.
Źródło:
World News of Natural Sciences; 2021, 38; 49-59
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Duel fuel compression ignition engine fuelled with homogeneous mixtures of propane and kerosene-based fuel
Autorzy:
Skrzek, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/133333.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
dual-fuel engine
kerosene-based fuel
propane
HCCI process
low NOx emissions
silnik dwupaliwowy
paliwo na bazie nafty
propan
spalanie mieszanki jednorodnej
niska emisja NOx
Opis:
The paper presents some results of examination of DF CI engine fuelled with kerosene-based fuel (Jet A-1) and propane. The aim was to obtain the maximum engine thermal and overall efficiency and checking the engine emissions for the application of significant share of propane as a main source of energy. The fuel which initiates the ignition was Jet A-1 provided by common rail system during the beginning of compression stroke. Propane was provided to inlet manifold in a gas phase. The method of providing of both fuels to the engine cylinder allowed to create nearly homogeneous mixture and realized HCCI process for dual fuelling with Jet A-1 and propane. It was possible to compare two combustion strategies PCCI and HCCI for fuelling of CI engine with single fuel (Jet A-1) and dual fuelling with Jet A-1 and propane. The results of experiment show that the NOx and soot emissions are much lower than for standard CI or SI engines. The results also show very interesting potential role of propane in control of HCCI dual fuel combustion process which gives the new perspective of dual fuel engine development. The low levels of toxic components in exhaust gases encourage to test and develop this type of fuelling which could radically confine the negative influence on the environment as well as enable to apply an alternative fuels.
Źródło:
Combustion Engines; 2019, 58, 3; 191-197
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of jatropha oil-kerosene fuel mixtures on the performance of a variable-load direct injection CI engine
Autorzy:
Ejilah, Robinson I.
Ogbaneme, Abiodun A.
Agboneni, Osazoduwa O.
Adekunle, Sikiru O.
Powiązania:
https://bibliotekanauki.pl/articles/24202418.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
jatropha oil
kerosene
CI engine
performance
emission
olej z jatrofy
nafta
silnik o zapłonie samoczynnym
wydajność
emisja
Opis:
Jatropha oil was blended with kerosene in ratios; JOK0, JOK20, JOK30, JOK40 and JOK50 and benchmarked against conventional diesel fuel. The blended fuel samples was test-run on a TD110-TD115 TQ small CI engine test rig, and emission levels for the fuel samples were examined using an SQV automobile exhaust gas analyser. The JOK20 fuel sample offered a better performance in terms of higher BP, BTE, and EGT followed by; JOK30, JOK40 and JOK50 blends; and also exhibited lower SFC, BSEC and AFR, hence less fuel consuming than diesel fuel. A reduction in CO emission was recorded for JOK20, and a significant cut was also observed for JOK30, JOK40 blends with load increase.; while, JOK30, JOK40 and JOK50 samples exhibited higher CO2 and lower UHC emission levels than diesel. No traceable level of NOx emission was recorded for JOK20 fuel sample.
Źródło:
Combustion Engines; 2023, 62, 1; 11--18
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
W sprawie oznaczania węglowodorów aromatycznych w nafcie kosmetycznej
K voprosu o opredelenii aromaticheskikh ugdevodorov v kosmeticheskojj nefti
Concerning the estimation of aromatic hydrocarbons in cosmetic kerosene
Autorzy:
Cwiertniewska, E.
Powiązania:
https://bibliotekanauki.pl/articles/872323.pdf
Data publikacji:
1957
Wydawca:
Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
Tematy:
nafta kosmetyczna
weglowodory aromatyczne
oznaczanie
norma PN-54/C-04047
metoda wagowa
metoda objetosciowa
zawartosc weglowodorow aromatycznych
cosmetic kerosene
aromatic hydrocarbon
determination
PN-54/C-04047 standard
weighing method
volume method
hydrocarbon concentration
carbohydrate content
Źródło:
Roczniki Państwowego Zakładu Higieny; 1957, 08, 2
0035-7715
Pojawia się w:
Roczniki Państwowego Zakładu Higieny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microwave plasma for hydrogen production from liquids
Autorzy:
Czylkowski, D.
Hrycak, B.
Miotk, R.
Jasiński, M.
Mizeraczyk, J.
Dors, M.
Powiązania:
https://bibliotekanauki.pl/articles/148564.pdf
Data publikacji:
2016
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
dry reforming
ethanol
hydrogen production
isopropanol
kerosene
microwave plasma
Opis:
The hydrogen production by conversion of liquid compounds containing hydrogen was investigated experimentally. The waveguide-supplied metal cylinder-based microwave plasma source (MPS) operated at frequency of 915 MHz at atmospheric pressure was used. The decomposition of ethanol, isopropanol and kerosene was performed employing plasma dry reforming process. The liquid was introduced into the plasma in the form of vapour. The amount of vapour ranged from 0.4 to 2.4 kg/h. Carbon dioxide with the fl ow rate ranged from 1200 to 2700 NL/h was used as a working gas. The absorbed microwave power was up to 6 kW. The effect of absorbed microwave power, liquid composition, liquid fl ow rate and working gas fl ow rate was analysed. All these parameters have a clear infl uence on the hydrogen production effi ciency, which was described with such parameters as the hydrogen production rate [NL(H2)/h] and the energy yield of hydrogen production [NL(H2)/kWh]. The best achieved experimental results showed that the hydrogen production rate was up to 1116 NL(H2)/h and the energy yield was 223 NL(H2) per kWh of absorbed microwave energy. The results were obtained in the case of isopropanol dry reforming. The presented catalyst-free microwave plasma method can be adapted for hydrogen production not only from ethanol, isopropanol and kerosene, but also from different other liquid compounds containing hydrogen, like gasoline, heavy oils and biofuels.
Źródło:
Nukleonika; 2016, 61, 2; 185-190
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Oil agglomeration of metal-bearing shale in the presence of mixed cationic-anionic surfactants
Autorzy:
Polowczyk, I.
Kruszelnicki, M.
Kowalczuk, P. B.
Powiązania:
https://bibliotekanauki.pl/articles/110617.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
adsorption
zeta potential
synergism
surfactants
kerosene
hydrophobic coagulation
Opis:
This paper reports oil agglomeration of fine metal-bearing shale particles in the presence of cationic (dodecylamine hydrochloride) and anionic (sodium dodecyl sulfate) surfactants and their mixture. The experimental results demonstrated that there was a strong relationship between zeta potential, hydrophobic coagulation, oil agglomeration and particle hydrophobicity in the presence of cationic surfactant, whereas shale neither coagulated nor agglomerated in the presence of anionic surfactant. Addition of either anionic or cationic surfactant in emulsification of a bridging oil increased the size of agglomerates and reduced the concentration of surfactant used in the suspension. The results pointed to synergism between cationic and anionic surfactants in oil agglomeration. Based on the results obtained from this study, the mechanism of oil agglomeration of shale in the presence of ionic surfactants and their mixture was elucidated.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 4; 1052-1059
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The future of sustainable aviation fuels
Autorzy:
Marszałek, Natalia
Lis, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/2202514.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
sustainable aviation fuel
kerosene
emissions
carbon dioxide
renewable feedstock
zrównoważone paliwo lotnicze
nafta oczyszczona
emisje
dwutlenek węgla
surowce odnawialne
Opis:
Presented work has an overview character and is focused on perspectives of sustainable aviation fuels application in civil aviation sector. The mean role of SAF application is to ensure reduction of greenhouse gas emissions and aviation footprint on environment. Paper describe the combustion proces of hydrocarbon fuels and problem related to the emission of carbon dioxide to the atmosphere. Fuel consumption, CO2 emission and SAF production data was presented on the graphs. The sustainalbe aviation fuel has been characterized. Certified conversion technologies with potential feedstock used for SAF production was described. Literature studies indicate that sustainable aviation fuel is successfully used in air transport.
Źródło:
Combustion Engines; 2022, 61, 4; 29--40
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on kerosene atomization process under a high speed air stream
Autorzy:
Perkowski, W.
Irzycki, A.
Snopkiewicz, K.
Grudzień, Ł.
Kawalec, M.
Powiązania:
https://bibliotekanauki.pl/articles/247137.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
transport
aircraft engine
combustion chamber
fuel atomization
Opis:
For the needs of fuel-injection system development for the experimental detonation combustion chamber with a rotating detonation (PoiG - Project: "Turbine engine with detonation combustion chamber") a series of experiments with injection of kerosene under a high speed air stream was performed at the Institute of Aviation. The proper preparation of combustible mixture is very important for the initiation and sustenance of a rotating detonation. The task in case of kerosene-air mixture is far more difficult than for mixtures of hydrogen-air or kerosene-oxygen. A simple stream injector has been tested as a base system, and the kerosene was injected perpendicular to the air stream vector directly from the plane wall of the constant cross-section channel. The process of injection and atomization of kerosene was observed in the special transparent visualization chamber, enabling the spray observation of two mutually perpendicular directions. In subsequent experiments air pressure, air temperature and air flow velocity as well as and injection pressure of kerosene were varied. The tested process was photographed and, in case of chosen experiments, filmed using a high-speed digital camera. The surveys were aimed at identifying and assessing of following parameters of fuel atomization process: the range of the fuel stream and filling grade of research channel with aerosol, aerosol homogeneity and the size of forming it droplets, the possible presence of fuel streams flowing down the walls of channel. The resulting photos allowed for more comprehensive, but only a qualitative assess of the spraying process, while the filmed small regions of visualization chamber allowed the counting down and dimensioning of droplets. This paper presents a test facility and measuring techniques applied during the research activity and selected results of carried out tests.
Źródło:
Journal of KONES; 2011, 18, 4; 341-347
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The increase of the performance of ultrafine coal flotation by using emulsified kerosene and the prediction of the flotation parameters by random forest and genetic algorithm
Poprawa efektywności flotacji węgla drobnoziarnistego przy wykorzystaniu emulsji naftowej oraz prognozowanie parametrów procesu flotacji przy użyciu metody lasów losowych oraz algorytmu genetycznego
Autorzy:
Oney, Ozcan
Powiązania:
https://bibliotekanauki.pl/articles/219716.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
flotacja węgla drobnoziarnistego
emulsja naftowa
metoda lasów losowych
algorytm genetyczny
ultrafine coal flotation
emulsified kerosene
random forest
genetic algorithm
Opis:
In this study, emulsified kerosene was investigated to improve the flotation performance of ultrafine coal. For this purpose, NP-10 surfactant was used to form the emulsified kerosene. Results showed that the emulsified kerosene increased the recovery of ultrafine coal compared to kerosene. This study also revealed the effect of independent variables (emulsified collector dosage (ECD), frother dosage (FD) and impeller speed (IS)) on the responses (concentrate yield (γC %), concentrate ash content (%) and combustible matter recovery (ε %)) based on Random Forest (RF) model and Genetic Algorithm (GA). The proposed models for γC %, % and ε% showed satisfactory results with R2. The optimal values of three test variables were computed as ECD = 330.39 g/t, FD = 75.50 g/t and IS = 1644 rpm by using GA. Responses at these experimental optimal conditions were γC % = 58.51%, % = 21.7% and ε % = 82.83%. The results indicated that GA was a beneficial method to obtain the best values of the operating parameters. According to results obtained from optimal flotation conditions, kerosene consumption was reduced at the rate of about 20% with using the emulsified kerosene.
W pracy zbadano możliwość wykorzystania emulsji naftowej do poprawy efektywności flotacji węgla drobnoziarnistego. W tym celu wykorzystano środek powierzchniowo czynny NP.-10 do utworzenia emulsji naftowej. Badania wykazały, że zastosowanie nafty w formie emulsji poprawiło wskaźniki odzysku węgla w porównaniu do procesów z wykorzystaniem nafty. W pracy badano także wpływ zmiennych zależnych (dozowanie emulsji w kolektorze ECD, dozowanie środka pianotwórczego FD, prędkość wirnika IS na wyniki procesu (uzysk koncentratu (γC %), zawartość popiołów (%) i stopień odzysku materii palnej (ε%), w oparciu o metodę lasów losowych i algorytm genetyczny. Proponowane modele pozwoliły na uzyskanie zadawalających wyników dla wskaźników γC %, %, ε %, w odniesieniu do współczynnika R2. Optymalne wartości badanych zmiennych ECD = 330.39 g/t, FD = 75.50 g/t and IS = 1644 obrotów na minutę obliczono przy wykorzystaniu algorytmu genetycznego. Wyniki procesu prowadzonego w wa-runkach optymalnych, określonych eksperymentalnie to γC % = 58.81 %; % = 21.7 %; ε % = 82.83 %. Uzyskane wyniki wskazują, że wykorzystanie algorytmu genetycznego jest metodą umożliwiającąotrzymanie najkorzystniejszych wartości parametrów pracy. Na podstawie wyników flotacji uzyskanych w najkorzystniejszych warunkach stwierdzono, że zużycie nafty obniżone zostało o ok. 20% dzięki zastosowaniu nafty w postaci emulsji.
Źródło:
Archives of Mining Sciences; 2019, 64, 1; 119-130
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Oil-assisted flotation of fine hematite using sodium oleate or hydroxamic acids as a collector
Autorzy:
Li, H.
Liu, M.
Liu, Q.
Powiązania:
https://bibliotekanauki.pl/articles/109749.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
hematite
sodium oleate
kerosene
Batch Flotation
Octyl hydroxamic acid
Oleoyl hydroxamic acid
Opis:
Micro-flotation and batch flotation tests were carried out on fine (-20 µm) hematite to investigate the influences of non-polar oil when sodium oleate, octyl hydroxamic acid, or oleoyl hydroxamic acid was used as a collector. Both micro-flotation and batch flotation tests were performed using single hematite mineral and/or artificial mixed minerals (hematite:quartz = 1:1), and kerosene was utilized as the neutral oil. The experimental results showed that the addition of a kerosene emulsion benefited hematite recovery in the micro-flotation tests where a froth layer did not exist. In the batch flotation where a froth layer existed, kerosene behaved differently when used in conjunction with the three collectors. Kerosene helped improve the batch flotation when sodium oleate or oleoyl hydroxamic acid was used as a collector. However, it reduced concentrate weight yield, grade and recovery to a noticeable extent when octyl hydroxamic acid was used as a collector, especially at low dosages. In addition, single hematite batch flotation kinetics tests coupled with water recovery measurement were carried out to study the role of kerosene at different collector dosages. It was observed that water drainage and the resulting froth destabilization by kerosene was dominant at low collector dosages, especially in the flotation using octyl hydroxamic acid. At higher collector dosages, the water drainage and froth destabilization effect by kerosene was possibly counter-balanced by the higher hematite surface hydrophobicity and bubble surface tension gradient, which led to more stable froth layer.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 4; 1130-1145
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of alpha and gamma radiolysis on Pu retention in the solvent TBP/kerosene
Autorzy:
Gao, Y
Zheng, W.
Cao, X.
Chen, S.
Powiązania:
https://bibliotekanauki.pl/articles/148296.pdf
Data publikacji:
2014
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
purex process
TBP solvent
alpha radiolysis
gamma radiolysis
Pu retention
Opis:
In light of the issue of radiolysis of the solvent system in PUREX process, alpha and gamma radiation stability of tributyl phosphate (TBP)/kerosene (OK) have been studied in this paper, in which 238Pu dissolved in the organic phase and 60Co are selected as alpha and gamma irradiation sources, respectively. The amount of the degradation products not easily removed after the washing process has been measured by the plutonium retention. The effects of the absorbed dose, the TBP volume fraction, the cumulative absorbed dose and the presence of UO2 2+ and Zr4+ on the radiolysis of the solvents have been investigated. The results have indicated that the Pu retention increases with the increase of the absorbed dose after alpha or gamma irradiation, and is larger for the solvent containing less TBP. There is competition between UO2 2+ and Pu4+ to complex with the degradation products, and Zr4+ accelerates the radiolysis of the system.
Źródło:
Nukleonika; 2014, 59, 4; 123-128
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Extraction rate of nickel in aqueous ammonium sulfate solution with 5-dodecylsalicylaldoxime in kerosene
Autorzy:
Sana, T.
Fujii, R.
Shiomori, K.
Kawano, Y.
Nagayoshi, K.
Powiązania:
https://bibliotekanauki.pl/articles/346929.pdf
Data publikacji:
2002
Wydawca:
Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
Tematy:
nickel
5-dodecylsalicylaldoxime
extraction rate
interfacial reaction
Lewis type transfer cell
Opis:
In order to clarify the adsorption equilibrium for the species of the extractant and the extraction complex, the interfacial tensions between the aqueous and the organic solutions were investigated, using equilibrated kerosene solution in the presence of 5-dodecylsalicylaldoxime (LIX® 860-IC) and aqueous solution in the presence and absence of nickel ion. The interfacial tensions decreased with increasing in the concentration of LIX® 860-IC. Experimental results of the interfacial tension were analyzed by Gibb’s adsorption isotherm. The adsorption equilibrium constant and the interfacial area for the extractant and the extraction complex were determined. The extraction rate of nickel from the aqueous ammonium sulfate solution with LIX® 860-IC in kerosene was investigated using a Lewis-type transfer cell. The concentration effects of extractant, nickel, and hydrogen ion on the extraction rate were examined. The extraction rate increased with increasing in the concentrations of nickel and the extractant, and approached to constant values depending on the extractant concentration at a high concentration of nickel. The rate increased with decreasing in the concentration of hydrogen ion, and approached to constant values depending on the extractant concentration. These results were analysed based on an interfacial reaction model in which the reaction proceeds between an extractant species adsorbed at the interface and nickel ion in the aqueous solution. The extraction rate is interpreted based on the rate equation in which the interfacial reaction between a 1:1 nickel chelate complex species adsorbed at the interface and the extractant in the organic solution is the rate-determining step. The reaction rate constants and equilibrium constants were determined.
Źródło:
Ars Separatoria Acta; 2002, 1; 35-44
1731-6340
Pojawia się w:
Ars Separatoria Acta
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 20

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