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Dissertations / Theses on the topic 'Extraction phosphoric acid'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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1

Booker, Nicholas Anthony. "Removal of cadmium from wet process phosphoric acid by cation exchange." Thesis, Imperial College London, 1989. http://hdl.handle.net/10044/1/47365.

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2

Murthy, Challa Venkata Ramachandra. "Modelling of the rate of stripping of zinc from di(2-ethylhexyl) phosphoric acid in n-heptane." Thesis, Imperial College London, 1987. http://hdl.handle.net/10044/1/8688.

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3

El, Mourabit Sabah. "Matériaux hybrides inorganiques-organiques pour l'extraction d'uranium en milieu acide phosphorique." Thesis, Montpellier 2, 2013. http://www.theses.fr/2013MON20035.

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Les minerais de phosphates, principalement exploités pour la production d'acide phosphorique et d'engrais, contiennent une quantité non-négligeable d'uranium (50 à 300 ppm) qui suscite l'intérêt de l'industrie nucléaire. Notre étude s'inscrit dans ce contexte de valorisation de l'uranium en tant que sous-produit de l'industrie des fertilisants.L'objectif de ce travail de thèse a été de mettre au point un matériau hybride, constitué d'un support inorganique sur lequel est greffée une molécule complexante, capable d'extraire sélectivement l'uranium du milieu acide phosphorique. La première étape

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4

MacLean, Donald William John. "The kinetics of zinc extraction in the di(2-ethylhexyl) phosphoric acid, n-heptane-zinc perchlorate, perchloric acid, water system." Thesis, University of British Columbia, 1991. http://hdl.handle.net/2429/30023.

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The kinetics of zinc extraction from perchlorate solutions with di(2-ethylhexyl) phosphoric acid in n-heptane have been measured using the rotating diffusion cell technique. The extraction of zinc is controlled by the mass transfer of reactants (Zn²⁺ and D2EHPA) to the interface. At low zinc concentrations, the system is controlled by the aqueous transport of Zn²⁺ to the interface; at higher zinc concentrations transport of D2EHPA becomes rate controlling. For the range of D2EHPA concentrations examined, the transport of D2EHPA is rate controlling. Bulk pH has a negligible effect, except perh

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5

Campos, Assunção Mariana. "Etude physicochimique et formulation d'un nouveau solvant d'extraction pour la purification de l'acide phosphorique." Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066045/document.

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Cette thèse avait pour objectif de développer de nouveaux systèmes d’extraction liquide-liquide compatibles avec le procédé Prayon pour la purification de l’acide phosphorique produit par voie humide. Une étude bibliographique complète des solvants d’extraction étudiés dans la littérature pour l’extraction liquide-liquide de l’acide phosphorique nous a permis d’identifier des candidats potentiellement intéressants. Une étude approfondie des propriétés d’extraction de ces systèmes et de leur sélectivité vis-à-vis des espèces métalliques nous a finalement permis de nous focaliser par la suite su

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6

Mouhib, Mohamed. "Equilibres entre phases liquides et solides dans les systèmes H₂O-H₃PO₄-Solvant (DIPE ; TBP ; MIBK ; Hexane) en vue de la purification de l’acide phosphorique : Étude expérimentale et modélisation thermodynamique." Electronic Thesis or Diss., Lyon 1, 2024. http://www.theses.fr/2024LYO10276.

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L'acide phosphorique (H3PO4) est le deuxième acide inorganique le plus produit au monde, principalement utilisé dans la fabrication d'engrais. Cependant, son utilisation dans des applications technologiques de pointe, telles que l'industrie des semi-conducteurs, nécessite une pureté extrêmement élevée qui ne peut être obtenue qu’après élimination poussée des cations métalliques et matière organique dissous, dont l’origine est la roche phosphatée initiale. Pour optimiser la purification de l'acide phosphorique élaboré par voie humide (WPA), il est primordial de maîtriser les équilibres entre ph

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7

Patel, Hamantkumar Vasudev. "The kinetics of liquid-liquid extraction of metals in a rotating diffusion cell : a rotating diffusion cell is used to study the rates of extraction of divalent transition metals by di-(2-ethylhexyl)-phosphoric acid and a sulphur analogue : a chemical-diffusion model describes the rate curves." Thesis, University of Bradford, 1988. http://hdl.handle.net/10454/5025.

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A rotating diffusion cell (RDC) has been used to study the kinetics of extraction of the transition metals cobalt (II), nickel (II), copper (II) and zinc (II) from sulphate solutions into either of two extractants held in n-heptane; di-(2-ethylhexyl) phosphoric acid (D2EHPA) or di-(2- ethylhexyl) dithiophosphoric acid (D2EHDTPA). The metal concentration was 10 mM and the aqueous pH was held at 4.5. The extractant concentration was varied between 0.015 to 0.4 M. In the case of cobalt extraction by D2EHPA, the metal concentration and the pH were varied Different diluents and modifiers were also

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8

Пляцук, Леонід Дмитрович, Леонид Дмитриевич Пляцук, Leonid Dmytrovych Pliatsuk та ін. "Огляд проблематики комплексної переробки фосфогіпсу". Thesis, Сумський державний університет, 2017. http://essuir.sumdu.edu.ua/handle/123456789/66521.

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Існує необхідність в оптимізації і підвищенні ефективності існуючих процесів селективного біовилуговування фосфогіпсу, для розробки комплексного технологічного рішення, спрямованого на зниження негативного впливу фосфогіпсових відвалів на навколишнє середовище і повноцінного використання компонентів фосфогіпсу у виробництві як вторинного ресурсу.

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9

Bakti, Jos. "Récupération d'acides malique et tartrique par extraction liquide-liquide. Application à la dépollution d'effluents agro-industriels." Toulouse, INPT, 1993. http://www.theses.fr/1993INPT009G.

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Les distilleries et caves cooperatives productrices de sucre de raisin rejettent dans l'environnement des effluents aqueux charges en produits polluants qu'il est imperatif d'eliminer. Parmi ces produits, les acides tartrique et malique constituent environ 50% de la charge organique dont l'extraction permet de diminuer la pollution du milieu naturel. Par ailleurs, l'acide malique present dans ces effluents residuaires est sous la forme levogyre pour laquelle il existerait un marche potentiel comme substitut de l'acide citrique dans l'industrie agroalimentaire, a condition que les couts de prod

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10

Chahal, Surinder P. "Organophosphorus acids for hydrometallurgical extraction. The synthesis of di(2-methylcyclohexyl)-, di(3-methylcyclohexyl)-, di(4-methylcyclohexyl)-, di(3,5-dimethylcyclohexyl)-, di(4-t-butylcyclohexyl)-, di(cyclohexylmethyl)- and dicyclohexyl- phosphinic; cyclohexylmethyl monocyclohexylmethylphosphonic; di(2-methylcyclohexyl)-, di(4-methylcyclohexyl)-, di(cyclohexylmethyl)- and di(cyclohexylethyl)- phosphoric acids and their evaluation as potential hydrometallurgical extractants for cobalt or nickel." Thesis, University of Bradford, 1987. http://hdl.handle.net/10454/4395.

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The syntheses and characterisation of di(cyclohexylmethyl), di(2-cyclohexylethyl), di(2-methylcyclohexyl) and di(4-methylcyclohexyl) phosphoric acids; cyclohexylmethyl phosphonic acid monocyclohexylmethyl ester, di(cyclohexylmethyl), di(4-methylcyclohexyl), di(4-tert- butylcyclohexyl), di(3-methylcyclohexyl), di(3,5-dimethylcyclohexy) and di(2-methylcyclohexyl) phosphinic acids are reported. Problems encountered and how they were resolved during the preparation of the above organophosphorus acids are reported and discussed in detail. These acids are then evaluated as potential hydrome

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11

Chahal, Surinder Pall. "Organophosphorus acids for hydrometallurgical extraction : the synthesis of di(2-methylcyclohexyl)-, di(3-methylcyclohexyl)-, di(4-methylcyclohexyl)-, di(3,5-dimethylcyclohexyl)-, di(4-t-butylcyclohexyl)-, di(cyclohexylmethyl)- and dicyclohexyl- phosphinic; cyclohexylmethyl monocyclohexylmethylphosphonic; di(2-methylcyclohexyl)-, di(4-methylcyclohexyl)-, di(cyclohexylmethyl)- and di(cyclohexylethyl)- phosphoric acids and their evaluation as potential hydrometallurgical extractants for cobalt or nickel." Thesis, University of Bradford, 1987. http://hdl.handle.net/10454/4395.

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The syntheses and characterisation of di(cyclohexylmethyl), di(2-cyclohexylethyl), di(2-methylcyclohexyl) and di(4-methylcyclohexyl) phosphoric acids; cyclohexylmethyl phosphonic acid monocyclohexylmethyl ester, di(cyclohexylmethyl), di(4-methylcyclohexyl), di(4-tert- butylcyclohexyl), di(3-methylcyclohexyl), di(3,5-dimethylcyclohexy) and di(2-methylcyclohexyl) phosphinic acids are reported. Problems encountered and how they were resolved during the preparation of the above organophosphorus acids are reported and discussed in detail. These acids are then evaluated as potential hydrometallurgic

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12

Smagghe, Freddy. "Séparation des acides tartrique et malique par extraction liquide-liquide. Valorisation et dépollution des effluents viti-vinicoles." Toulouse, INPT, 1991. http://www.theses.fr/1991INPT040G.

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En rejetant dans l'environnement des effluents aqueux charges, les distilleries et caves cooperatives productrices de sucre de raison (mout concentre rectifie) engendrent une pollution importante. L'elimination des acides malique et tartrique qui constituent 40% de la charge organique est un moyen de diminuer cette pollution. La mise au point d'un procede de separation performant permettrait une valorisation des acides malique et tartrique naturels. La technique retenue est l'extraction liquide-liquide en utilisant des composes organophosphores comme solvant. Pour optimiser rendement et select

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13

CRISTINA, GIULIO. "The hidden potential of digested sewage sludge: a recycling approach to combat desertification." Doctoral thesis, Politecnico di Torino, 2021. http://hdl.handle.net/11583/2903484.

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14

Navick, Caldentey Martine. "Contribution à l'étude des phénomènes de synergie en extraction liquide-liquide : application à l'extraction du nickel(II) et du cobalt(II) en milieu acide." Paris 6, 1986. http://www.theses.fr/1986PA066297.

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Etude des propriétés d'agent d'extraction des acides di(alkyl)dithiophosphoriques ; ils ne peuvent pas être utilisés industriellement car ils s'hydrolysent rapidement au contact d'une phase aqueuse des 35**(o). En fait il semble que les anions di(alkyl) monothiophosphoriques conviennent, utilises en même temps qu'une oxime. Effet de divers facteurs sur la cinétique d'extraction. On peut séparer à ph1, ni et co par une extraction par acide di(ethyl)monothiophosphorique et quinoleinols-8 substitués.

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15

WEHREY-AUGUSTIN, FABIENNE. "Oxydo-reduction du neptunium dans les melanges phosphate tributylique-dodecane." Université Louis Pasteur (Strasbourg) (1971-2008), 1988. http://www.theses.fr/1988STR13007.

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Etude des reactions de dismutation et d'oxydation (parhno::(3)) de np(v) dans les melanges tbp-dodecane. La dismutation de np(v) en milieu perchlorique est une reaction d'ordre 2 par rapport a np. Cinetique et energie d'activation de la reaction

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16

Aguiar, Caroline Mariana de. "Efeito da adubação fosfatada sobre características agronômicas e qualidade do óleo da cultura de crambe." Universidade Estadual do Oeste do Parana, 2016. http://tede.unioeste.br:8080/tede/handle/tede/273.

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Made available in DSpace on 2017-05-12T14:47:40Z (GMT). No. of bitstreams: 1 CAROLINE _MARIANA DE AGUIAR.pdf: 1356373 bytes, checksum: ac83e2629222749c1fb2c1a826a24117 (MD5) Previous issue date: 2016-02-05<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>Crambe stands out for its rusticity, yield potential, and oil quality and capacity. However, literature about the plant s development considering phosphate fertilization is still insipient, as well as studies to throroughly evaluate phosphorus effect in the oil quality, including research about carotenoids, chlorophylls, phe

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17

Zhuang, Rui-Xin, and 莊瑞鑫. "Mass transfer of metal ions extraction with Di (2-ethylhexyl) phosphoric acid." Thesis, 1986. http://ndltd.ncl.edu.tw/handle/66337350323511559116.

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18

Liu, Tien-Sheng, and 劉典昇. "Feasibility of using phosphoric acid for extraction of aluminum oxide from furnace dust." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/g44tcn.

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碩士<br>國立中山大學<br>環境工程研究所<br>106<br>Aluminum smelting is one critical process in the aluminum-regeneration industries. In Taiwan, the production of aluminum-containing dusts produced by smelting exceeds 100,000 tons/year. The principal constituents in aluminum-containing dusts include metal aluminum, aluminum oxide, aluminum nitride, and aluminum carbide. By effectively recycling and reusing aluminum-containing dusts, elevating the aluminum recovery of the processes, and increasing the feasibility of producing aluminum oxide-containing produces, the land area and cost needed for the aluminum-con

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19

Huang, Qing-Cun, and 黃慶村. "Studies on the extraction of uranium (VI) from nitric acid solutions with Di (2-ethylhexyl) phosphoric acid." Thesis, 1988. http://ndltd.ncl.edu.tw/handle/42303355180866527034.

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20

Wu, Chin-Chih, and 吳錦質. "A Study on the Extraction of Cadmium(II) with Di(2-ethylhexyl) phosphoric acid." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/37230744913643780202.

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21

Su, Hsu-wen, and 蘇許文. "The Removal of Heavy Metals in the Incinerator Fly Ash by Phosphoric Acid Extraction followed by Electro-aggregation Method." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/97354630134733532342.

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碩士<br>淡江大學<br>水資源及環境工程學系<br>89<br>As Municipal Solid Waste reduction, separation and recycling systems have been building in Taiwan. Most waste, which contains heavy metals, is mixed into MSW Incinerator System; it causes that most heavy metals in the incinerator fly ash (ex. Pb, Cd, Cr, Cu) are more than other countries. From the result, incinerator fly ash contains much chloride, and heavy metals, such as lead, cadmium, and zinc, and it follows the chloride to leach. Therefore, heavy metals concentration of TCLP（Toxicity Characteristic Leaching Procedure） might exceed TCLP standards. In

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22

Chien, Yu-Shan, and 簡妤珊. "The Extraction Equilibria of the Yttrium(III) and Lanthanum(III) with Di(2-ethylhexyl) Phosphoric Acids." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/j8ns66.

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碩士<br>國立臺北科技大學<br>化學工程研究所<br>105<br>In this study, the equilibrium of the separation of Yttrium(III) and Lanthanum(III) by solvent extraction methods were investigated at 25C；meanwhile, the acidic extractants D2EHPA was used. It began with the extraction equilibrium of Yttrium(III) and Lanthanum(III) in extractants-kerosene solution and extractants-aqueous solution, and eventually the mixed Yttrium(III) and Lanthanum(III) extractants-aqueous solution was studied. The experimental results indicated that the extraction distribution ratio of Yttrium(III) and Lanthanum(III) increased with either

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