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Dissertations / Theses on the topic 'Organic solvent extractions'

Author: Grafiati

Published: 5 June 2025

Last updated: 2 August 2025

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1

Dakubo, Francis. "Sustainable Mining - Solving the Problem of Chalcopyrite Treatment/Processing - Leaching, Solvent Extraction & Flotation." Diss., The University of Arizona, 2016. http://hdl.handle.net/10150/604862.

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Chalcopyrite ore forms the significant fraction of copper deposits in the earth crust. However, it is also the most difficult to treat using conventional ferric leaching methods. Smelting and electro-refining are currently the methods used in treating chalcopyrite concentrate obtained from froth flotation. Due to the ever increasing environmental requirements on smelters by the Environmental Protection Agency, new smelters are scarce in the United States. The scarcity of smelters has led to the urgent need to find a novel leaching method for the abundant chalcopyrite deposits in the USA and th

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2

Copcutt, Robert Charles. "Modeling of a counter-current adsorption process for removal and recovery of dissolved organics from aqueous effluents." Thesis, University of Cape Town, 1988. http://hdl.handle.net/11427/23191.

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3

Van, der Ryst Reinier Hendrik. "Evaluation of the solvent extraction organic phase in a uranium extraction plant / Reinier Hendrik van der Ryst." Thesis, North-West University, 2010. http://hdl.handle.net/10394/4921.

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Using kerosene as an aromatic organic diluent in the liquid–liquid separation process for the extraction of uranium in the solvent extraction section of the AngloGold Ashanti South Uranium Plant near the town of Orkney in South Africa, incurs a multitude of safety, health and environmental problems. A possible solution may be to replace the currently used aromatic–based organic diluent with an aliphatic–based organic diluent. A range of aliphatic organic diluents were tested to determine the extraction efficiency of these alternative diluents, if they were to be applied to the process currentl

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4

Kabir, Anwar. "Dechlorination of chlorinated organic compounds by zero-valent and bimetallic mixture." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=31246.

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Organochlorine (OC) compounds that include several pesticides as well as an array of industrial chemicals were very efficacious for their intended use but were also characterized by deleterious environmental impacts when released either intentionally or inadvertently. Their lipophilic nature, long persistence in the environment and threat to human health caused all the developed countries to ban the production of these chemicals as well as restricted the use of formulations containing these material for food production.<br>A number of scientists have become involved in the development of inten

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5

Mehet, S. K. "The synthesis of phenolic lipids and their derivatives for use in the solvent extraction of boron." Thesis, Brunel University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233234.

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6

Ekcan, Ismail. "Metal complexes of selected 5-alkylamino-1,2-benzoquinone-2-oximes and their applicability in solvent extraction." Thesis, London Metropolitan University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.341731.

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7

Mokgadi, Janes. "Pressurized hot water extraction of nutraceuticals and organic pollutants from medicinal plants." Thesis, Rhodes University, 2011. http://hdl.handle.net/10962/d1004999.

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This thesis explores the robustness and the versatility of pressurized hot water extraction (PHWE) for a variety of analytes and matrices. Applications discussed include: selective extraction of alkaloids in goldenseal followed by their degradation studies; in-cell clean-up of pesticides in medicinal plants employing custom made molecularly imprinted polymers (MIPs) sorbents; in-cell pre-concentration followed by desorption of aflatoxins in plants with MIPs; desorption of pesticides from electrospun nanofiber sorbents; and removal of templates from MIPs sorbents. It was demonstrated that selec

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8

ZHANG, WENWEN. "Catalytic Conversion of Sugar Mixtures into Furan Products in Ionic Liquid Media with Organic Solvent Extraction." University of Toledo / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1341540235.

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9

Failali, Abdelmounaim. "Molecular modeling of organic phases after plutonium extraction." Electronic Thesis or Diss., Université de Lille (2018-2021), 2021. http://www.theses.fr/2021LILUR002.

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Après son séjour au sein d'un réacteur nucléaire, le combustible contient encore une quantité importante de matières valorisables qu’il est intéressant de récupérer, à savoir le plutonium et l'uranium.La récupération et la purification de ces actinides sont réalisées à l'aide d'un procédé hydrométallurgique appelé PUREX (Plutonium Uranium Recovering by Extraction), basé sur les techniques d'extraction liquide-liquide. Ce procédé nécessite l'utilisation d'une molécule spécifique pour extraire Pu et U, le phosphate de tri-n-butyle TBP. Les N, N-dialkylamides (monoamides) sont considérés comme un

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10

Bayramoglu, Beste. "Solvent-free Microwave Extraction And Microwave-assisted Hydrodistillation Of Essential Oils From Spices." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/2/12608874/index.pdf.

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ABSTRACT SOLVENT-FREE MICROWAVE EXTRACTION AND MICROWAVEASSISTED HYDRODISTILLATION OF ESSENTIAL OILS FROM SPICES Bayramoglu, Beste M.S., Department of Food Engineering Supervisor: Assoc. Prof. Dr. Serpil Sahin Co-Supervisor: Assoc. Prof. Dr. S. G&uuml<br>l&uuml<br>m S&uuml<br>mn&uuml<br>September 2007, 130 pages The undesirable effects of conventional methods generated the need for economical and safe techniques in the extraction of essential oils. Microwave-assisted hydrodistillation (MAHD) and solvent-free microwave extraction (SFME) are recently developed techniques, which are thought to ov

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11

HECKER, SUSAN. ": Extraction of β-carotene from orange peel and carrot waste for cotton dyeing". Thesis, Högskolan i Borås, Institutionen Textilhögskolan, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-18017.

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The further usage of vegetable and plant waste from juice pressing industry as textile dyes is presented in this thesis. The thesis is focused on β-carotene (C40H56) dyestuff extracted from orange peel and carrot residue. The three organic solvents; ethyl acetate, petroleum ether and hexane/acetone (1:1 v/v) were used for the extraction. The analysis of the extract was done by RP-HPLC with a C18 column. The yield and the purity of the extracted β-carotene were determined. The highest yield was achieved with petroleum ether whereas the other two solvents were nearly as good. The highest and pur

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12

Faux-Mallet, Marie-Sabine. "Extraction du gallium(iii) en milieu acide : comparaison des methodes d'extraction liquide-liquide et d'echange d'ions sur resines." Paris 6, 1988. http://www.theses.fr/1988PA066234.

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Comparaison des avantages et des inconvenients de l'extraction a l'aide de resines et de l'extraction liquide-liquide en vue de preciser leur domaine respectif d'utilisation en hydrometallurgie. Etude de la separation du gallium contenu dans les solutions d'attaque des minerais de zinc. Utilisation de la resine duolite es467 et pour l'extraction liquide-liquide de l'hydroxy-8 quinoleine et d'une alpha-hydroxy-oxime

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13

Rix, Catherine S. "Detecting life on Mars and the life marker chip : antibody assays for detecting organic molecules in liquid extracts of Martian samples." Thesis, Cranfield University, 2012. http://dspace.lib.cranfield.ac.uk/handle/1826/7250.

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The Life Marker Chip instrument, which has been selected to fly as part of the 2018 ExoMars rover mission payload, aims to detect up to 25 organic molecules in martian rocks and regolith, as markers of extant life, extinct life, meteoritic in-fall and spacecraft contamination. Martian samples will be extracted with a solvent and the resulting liquid extracts will be analysed using multiplexed microarray-format immunoassays. The LMC is under development by an international consortium led by the University of Leicester and the work described within this thesis was carried out at Cranfield Univer

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14

GOMES, RAPHAEL F. "Avaliação de compostos orgânicos semi-voláteis em amostras de águas subterrâneas via CG/EM utilizando microextração líquido-líquido dispersivo - DLLME." reponame:Repositório Institucional do IPEN, 2014. http://repositorio.ipen.br:8080/xmlui/handle/123456789/23176.

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Submitted by Claudinei Pracidelli (cpracide@ipen.br) on 2014-12-19T17:05:43Z No. of bitstreams: 0<br>Made available in DSpace on 2014-12-19T17:05:43Z (GMT). No. of bitstreams: 0<br>Dissertação (Mestrado em Tecnologia Nuclear)<br>IPEN/D<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP

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15

Silva, Liliana Cristina Vieira da. "Development of a sustainable method for the extraction of lycopene and β-carotene from food wastes". Master's thesis, Universidade de Aveiro, 2015. http://hdl.handle.net/10773/15490.

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Mestrado em Biotecnologia - Biotecnologia Alimentar<br>The main objective of the present work is the study of a profitable process not only in the extraction and selective separation of lycopene and β-carotene, two compounds present in tomato, but also in its potential application to food industry wastes. This is one of the industries that produce larger amounts of wastes, which are rich in high value biomolecules with great economic interest. However, the conventional methods used to extract this kind of compounds are expensive which limits their application at large scale. Lycopene and βcaro

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16

Nording, Malin. "Rapid sample preparation and bioanalytical techniques for efficient screening of organic pollutants in the environment." Doctoral thesis, Umeå universitet, Kemi, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-842.

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Large numbers of samples often need to be prepared and analysed in surveys of organic pollutants in the environment, but while the methods commonly used in such surveys can provide abundant detail they are generally costly, time-consuming and require large amounts of resources, so there is a need for simpler techniques. The work underlying this thesis assessed the potential utility of more convenient sample preparation and bioanalytical techniques for rapidly screening various environmental matrices that could be useful complements to higher resolution methods. Initially, the utility of a simp

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17

Loret, Jean-François. "Extraction de metaux precieux par des gels organiques." Université Louis Pasteur (Strasbourg) (1971-2008), 1987. http://www.theses.fr/1987STR13068.

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Preparation de gels qui sont des polymeres reticules qui gonflent lorsqu'ils sont plonges dans des solvants adequats. Le gel pvc-tbp est utilise pour extraire l'or en milieu hcl : les ions m(cn)::(2)**(-) (m=ag,au) en milieu koh sont extraits par le gel dcy-18c6-chcl::(3)-br (br = polylentadiene)

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18

Leguay, Sébastien. "Complexation des actinides (III, IV et V) par des acides organiques." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00762743.

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L'acquisition de données structurales et thermodynamiques relatives à des systèmes actinides (An(III), Pu(IV) Pa(V))-acides organiques polyfonctionnels (citrique, NTA, DTPA), en solution aqueuse, vise à une meilleure compréhension des interactions actinides-ligands essentielle à l'optimisation de procédés de séparation, de décorporation, et également à l'évaluation de la sûreté des sites de stockage de déchets radioactifs. Le comportement du protactinium pentavalent à l'échelle des traces en présence des anions citrates et NTA a fait l'objet d'études systématiques par extraction liquide-liquid

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19

Meindl, Jiří. "Stanovení organických sloučenin ve vzorcích biouhlu získaných mikrovlnou torefakcí biomasy." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2019. http://www.nusl.cz/ntk/nusl-401893.

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The thesis is focused on a determination of polycyclic aromatic hydrocarbons (PAHs) contained in dried pelletized sewage sludge and pelletized biochar. Biochars were made in mild conditions by microwave torrefaction of prepared sewage sludge. There were analyzed and quantified the 34 of standardized PAHs compounds in two series. The first serie, also called “Sada 1”, has been aimed at comparison of extraction methods for the chosen sample of sewage sludge and the sample of biochar. In serie “Sada 1”, there were compared efficiencies of chosen type of solvent or solvent mixture by comparison of

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20

Leite, José Alberto Corrêa. "Produção de ácidos graxos voláteis por fermentação acidogênica em reator anaeróbio de leito fixo e extração em resina de troca iônica e com solvente orgânico." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/18/18138/tde-18122006-122449/.

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Nesse trabalho utilizou-se o reator anaeróbio horizontal de leito fixo (RAHLF) para produção de ácidos graxos voláteis (AGVs). O reator, com volume total de 2,38 litros, foi preenchido com partículas de argila expandida e alimentado com substrato sintético à base de glicose. Com concentração de glicose de 2000 mg/L, sem adição de alcalinizante e com tempo de detenção hidráulica (TDH) de 2 horas, houve produção de ácidos acético, butírico e propiônico. Com a variação do (TDH) de 2 horas para 0,5 hora, em condições idênticas, houve redução da produção do ácido butírico. Na segunda condição testa

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21

Gitirana, Luciana Lintomen. "Avaliação do processo de extração liquido-liquido com a adição de sais para recuperação e purificação de acidos organicos." [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/266258.

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Orientadores: Maria Regina Wolf Maciel, Antonio Jose de Almeida Meirelles<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Quimica<br>Made available in DSpace on 2018-08-11T14:05:30Z (GMT). No. of bitstreams: 1 Gitirana_LucianaLintomen_D.pdf: 2222416 bytes, checksum: a70434bb137c8a74550f9b83da7277f0 (MD5) Previous issue date: 2007<br>Resumo: Esse estudo objetiva uma avaliação crítica do processo de extração líquido-líquido de ácidos orgânicos, produzidos principalmente por fermentação. Os ácidos orgânicos de interesse nesse trabalho são: ácido cítrico, ácido m

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22

Minier, Michel. "Fermentation acetonobutylique par couplage a des procedes membranaires et fermentation extractive." Toulouse 3, 1987. http://www.theses.fr/1987TOU30290.

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23

Eickmeyer, David. "The Effects of Retrogressive Thaw Slump Development on Persistent Organic Pollutants in Lake Sediments of the Mackenzie River Delta Uplands, NT, Canada." Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/25998.

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Using a comparative spatial and temporal analysis on sediment cores from 8 lakes in the Mackenzie River Delta uplands region, NT, Canada, this study assessed how persistent organic pollutant (POP) deposition to lake sediments was affected by: (1) the presence of retrogressive thaw slumps on lake shores; and (2) changes occurring with increased autochthonous primary productivity. POPs examined included polychlorinated biphenyls (PCBs), penta- and hexachlorobenzenes (CBzs), and dichlorodiphenyltrichloroethane and metabolites (DDTs). Surface sediments of slump-affected lakes contained higher tota

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24

hsiang, Chang chao, and 張肇祥. "Studies on the organic solvent extraction and composition analysis of tea." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/23918614323975097638.

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碩士<br>國立聯合大學<br>化學工程學系碩士班<br>103<br>According to scientific reports, tea has many effective components. They are caffeine as refreshment and cardiac stimulant, catechin as antioxidant and lower cholesterol, vitamins (A, B1, B2, C, E), minerals (rich in potassium and prevention of hypertensionhas), flavonols (eliminate bad breath), saponin (anti-inflammatory), and -aminobutyric acid (antihypertensive). The amount of catechin in green tea is relatively higher than other types of tea. This study aims to study the total yield of extraction from green tea by organic solvent extraction. By using et

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25

Tizaoui, Chedly, M. J. Slater, and D. B. Ward. "Extraction and destruction of organics in wastewater using ozone-loaded solvent." 2004. http://hdl.handle.net/10454/3172.

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No<br>Originally developed as a heat exchange fluid, Volasil 245 (decamethylcyclopentasiloxane) has been found to dissolve 10 times more ozone than water does. This article proposes and investigates the extraction of wastewater contaminants to ozone-loaded Volasil 245 as a means of providing rapid treatment. In a series of bench-scale tests, the effectiveness of ozone-loaded Volasil 245 contact was compared with that of conventional gas contact. Tests were conducted with respect to a range of organic compounds: namely, phenol, 2-chlorophenol, 2,3-dichlorophenol, 1,3-dichlorobenzene, o-nitrotol

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26

Taqui, Syed Usman. "Fractionation of hydro-ethanolic extracts from grape pomace through membrane processing: the effect of membrane and extracting media on process performance." Master's thesis, 2014. http://hdl.handle.net/10362/13289.

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The EM3E Master is an Education Programme supported by the European Commission, the European Membrane Society (EMS), the European Membrane House (EMH), and a large international network of industrial companies, research centers and universities<br>Grape pomace are generated as waste in juice and winemaking industry in huge quantities. Studies have shown that nutrient extracts from these particular plant matrices garner myriad of benefits in health and nutraceuticals sector. Moreover, the newer recognition of monomeric and oligomeric phenolic compounds as bioactive molecules of commercial va

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27

Chiang, Wen-Chih, and 江文智. "Removal of Organic Compounds of Wastewater in TNT Manufacturing process by Solvent Extraction." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/84131263738749755303.

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碩士<br>國立雲林科技大學<br>工業化學與災害防治研究所<br>93<br>This study investigate the removal of organic compunds of wastewater by solvent extraction in DNT and 2,4,6-TNT manufacturing process respectively.It aims at the simplification of treatment of wastewater. Beside,the toluene solvent can be used as feedstock in the toluene nitration process. Firstly,the toluene extraction experiments were conducted on the wastewater derived from DNT manufacturing process.The results show that the removal percentage of organic compounds in wastewater reaches 93.0％ under the following condition：extracting temperature＝50℃

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28

Lun, Chen Cheng, and 陳政倫. "Studies on the Components in Cinnamomum Camphora Wood Extracted with Supercritical Carbon Dioxide Extraction and Organic Solvent Extraction." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/56372468641318847510.

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碩士<br>國立聯合大學<br>化學工程學系碩士班<br>102<br>According to scientific reports, compounds of camphor, such as bicyclic hydrocarbon from pine oil, camphorene, limonene, eugenol, has the ability to resist cancer and purify air. long-term living in a camphor environment will avoid a lot of illness. This study aims to study the difference of extraction of the components in cinnamomum camphora wood by supercritical carbon dioxide extraction and by organic solvent extraction. Compounds extracted from these two methods were analyzed by GC. In organic solvent extraction, we found that the best extraction con

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29

Tizaoui, Chedly, M. J. Slater, and D. B. Ward. "Continuous extraction and destruction of chloro-organics in wastewater using ozone-loaded Volasil (TM) 245 solvent." 2005. http://hdl.handle.net/10454/3140.

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No<br>Extracting waterborne contaminants to ozone-loaded Volasil¿245 (a siloxane solvent in which ozone is ten times more soluble than water) has been studied as a means of enhancing reaction kinetics and thus, providing more rapid wastewater decontamination. Investigation was carried out with respect to 2-chlorophenol and dichloromethane. Using a pilot scale continuous flow liquid¿liquid/ozone water treatment system, 2-chlorophenol was extracted to the ozone-loaded solvent phase and considerable extents of destruction were achieved. However, the approach was demonstrated to yield slightly les

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30

Mulanga, Tshimanga Christelle. "Investigation of selected organic compounds on water quality along the Olifants river catchment." Diss., 2016. http://hdl.handle.net/10500/22294.

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Water is a crucial natural resource, indispensable to food production, life, the environment, power generation, industry, sanitation and hygiene. The presence of Organochlorine Pesticides (OCPs) in the environment is not wanted due to their negative effects on human beings and animals. As a result, there is a need to continuously monitor their presence in the environment. In this study, surface water samples were collected once a month during the dry season and during wet season from the selected five points along the Olifants River and stored at a temperature of < 50C before analysis. The OCP

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31

Brás, Teresa Isabel de Amoreira Sousa e. Silva. "Production of cynaropicrin extracts from Cynara cardunculus leaves and its use for development of wound dressing films." Doctoral thesis, 2020. http://hdl.handle.net/10362/111454.

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Natural compounds derived from plants are presently an alternative for the discovery of new effective drugs, from which new products may be developed, potentially overcoming the current limitations of synthetic compounds for use in pharma and biomedical applications. This thesis concerns the design and production of cynaropicrin enriched extracts from leaves of Cynara cardunculus, and their application in a chitosan matrix as wound dressing for antiinflammatory drug delivery. The design and production of cynaropicrin enriched extracts was performed considering the use of environmentally

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32

Lima, Vasco José Costa de. "Valorisation of phenolic compounds from grape pomace." Master's thesis, 2017. http://hdl.handle.net/10362/28541.

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Every year millions of tonnes of waste are generated by the food industry. Producing wine is major cultural and economical activity but is also responsible for a large amount of waste in a short period of time. Grape pomace is the main by-product, a cheap material known for being rich in phenolic and other valuable compounds. This work aimed at optimizing the conditions (duration, temperature, solid:liquid ratio and concentration of the enzyme) for sequential extractions (water and acetone-based) process from red and white grape pomace (Vitis vinifera cultivars Merlot and Garganega, respectiv

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