Kinetics of extraction of nitric acid into binary mixture of tri-n-butyl phosphate and normal paraffin hydrocarbon

Pandey, N. K.; Augustine, Elizabeth; Murali, Remya; Desigan, N.; Mudali, U. Kamachi; Joshi, Jyeshtharaj B.

doi:10.1016/j.cherd.2016.05.017

Cited by 15 publications

(9 citation statements)

References 23 publications

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“…5 shows that the zirconium conversion fraction will increase with an increase of stirring speed from 50 to 125 rpm. Based on Pandey research [17] at a low stirring speed, the interface thickness of the film on ZOC solids is still too large so that it is difficult to penetrate by diffusion of nitric acid. As a result, the conversion of the dissolution fraction is still low, whereas at high speeds the chemical reaction will be dominant so that the fraction conversion is not affected by the stirring speed.…”

Section: Effect Of Stirring Speedmentioning

confidence: 99%

Optimization and Kinetics of Zirconium Oxychloride (ZOC) Dissolution Using HNO<sub>3</sub>

Purwani¹,

Muzakky²

2019

Indones. J. Chem.

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The design of chemical reactor can not be separated from the optimization data and reaction kinetics obtained from the experimental measurement. Through the idea of making the dissolution reactor design, the purpose of this research is to obtain optimization data and dissolution kinetics of Zirconium Oxide Chloride (ZOC) using HNO3. The design of the solvent reactor is required to make the feedstock in the liquid-liquid extraction process continuously. The extraction process is a mini-pilot plant unit as a nuclear-grade zirconia manufacture. The dissolution optimization was carried out by dissolving ZOC solids of zircon sand processed products using HNO3 in a container with some variation of contact time, HNO3 concentration and temperature. While the kinetics data was gained by extracting from the optimization data obtained based on the formula of reaction orders. The investigation result with 6 gr of ZOC and 6M HNO3 concentration obtained the best contact optimum time of 2 minutes and the conversion number (α) of 0.96. The dissolution reaction mechanism was estimated in accordance with the reaction of order 1 with the k value of 1.5879 minutes-1. It was predicted that the reaction mechanism of ZOC dissolution in HNO3 begins with diffuse control and is followed by chemical reaction control. With increasing conversion temperature, the conversion will increase to 0.98, while the reaction also follows the reaction order 1. The optimum temperature at 60 °C, and the correlation between temperature (T) with the calculated reaction rate constant (k) according to the Arrhenius formula yielded an equation of ln k = - 4191,6 / T + 13,903 or k = 13,903.e- 4191,6 / T, with the frequency factor A = 1091430 and the activation energy E = 34,848 kJ / mole.

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Section: Effect Of Stirring Speedmentioning

confidence: 99%

Optimization and Kinetics of Zirconium Oxychloride (ZOC) Dissolution Using HNO<sub>3</sub>

Purwani¹,

Muzakky²

2019

Indones. J. Chem.

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“…The adduct forms at or close to the interface before transferring to the organic phase. 29 The extraction can be measured by determining the concentration of HNO 3 in the organic and aqueous phase as a function of time. Concentrations of HNO 3 and TBP in n-dodecane were chosen to reflect concentrations relevant to the PUREX process.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

“…For a directly comparative analysis, Pandey et al studied the macro-scale extraction of nitric acid by tributyl phosphate in n -paraffin hydrocarbons using various organic and aqueous concentrations. While the extraction itself is similar in mechanism, the experimental set up and data treatment differ.…”

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confidence: 99%

Micro-Raman Technology to Interrogate Two-Phase Extraction on a Microfluidic Device

et al. 2018

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Microfluidic devices provide ideal environments to study solvent extraction. When droplets form and generate plug flow down the microfluidic channel, the device acts as a microreactor in which the kinetics of chemical reactions and interfacial transfer can be examined. Here, we present a methodology that combines chemometric analysis with online micro-Raman spectroscopy to monitor biphasic extractions within a microfluidic device. Among the many benefits of microreactors is the ability to maintain small sample volumes, which is especially important when studying solvent extraction in harsh environments, such as in separations related to the nuclear fuel cycle. In solvent extraction, the efficiency of the process depends on complex formation and rates of transfer in biphasic systems. Thus, it is important to understand the kinetic parameters in an extraction system to maintain a high efficiency and effectivity of the process. This monitoring provided concentration measurements in both organic and aqueous plugs as they were pumped through the microfluidic channel. The biphasic system studied was comprised of HNO as the aqueous phase and 30% (v/v) tributyl phosphate in n-dodecane comprised the organic phase, which simulated the plutonium uranium reduction extraction (PUREX) process. Using pre-equilibrated solutions (post extraction), the validity of the technique and methodology is illustrated. Following this validation, solutions that were not equilibrated were examined and the kinetics of interfacial mass transfer within the biphasic system were established. Kinetic results of extraction were compared to kinetics already determined on a macro scale to prove the efficacy of the technique.

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“…All these research results show the prospects of ATPS application for the extraction of organic compounds. However, little information is presented in the literature on the kinetics of extraction of substances in ATPS, which is necessary for the calculation of mass transfer characteristics and the design of extraction equipment [20,21].…”

Section: Introductionmentioning

confidence: 99%

Study of caffeine and coumarin extraction kinetics in an aqueous two-phase system based on polyethylene glycol 1500

Зиновьева

2022

IOP Conf. Ser.: Mater. Sci. Eng.

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Caffeine and coumarin are organic compounds of plant origin, which have biological activity and have found wide application in medicine, pharmaceutical, perfumery and food industries. Recovery of caffeine and coumarin from aqueous solutions using liquid-liquid extraction is the most effective method. In the present work the kinetic dependences of caffeine and coumarin in the aqueous two-phase system (ATPS) of PEG 1500 - Na2SO4 - H2O were experimentally obtained. It was established that equilibrium in the system is achieved after 17 minutes for caffeine and after 12 minutes for coumarin. The effect of ultrasound on the extraction rate of caffeine and coumarin in an aqueous two-phase system was also studied.

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Kinetics of extraction of nitric acid into binary mixture of tri-n-butyl phosphate and normal paraffin hydrocarbon

Cited by 15 publications

References 23 publications

Optimization and Kinetics of Zirconium Oxychloride (ZOC) Dissolution Using HNO<sub>3</sub>

Optimization and Kinetics of Zirconium Oxychloride (ZOC) Dissolution Using HNO<sub>3</sub>

Micro-Raman Technology to Interrogate Two-Phase Extraction on a Microfluidic Device

Study of caffeine and coumarin extraction kinetics in an aqueous two-phase system based on polyethylene glycol 1500

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