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Vanadium(Ⅳ)solvent extraction enhancement in high acidity using di-(2-ethylhexyl)phosphoric acid with[Cl^(-)]present:an experimental and theoretical study

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Frontiers of Chemical Science and Engineering 2023年第1期17卷 56-67页

作者： Hong Liu Yi-Min Zhang Jing Huang Tao Liu School of Resource and Environmental Engineering Wuhan University of Science and TechnologyWuhan 430081China State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control Wuhan University of Science and TechnologyWuhan 430081China Hubei Collaborative Innovation Center for High Efficient Utilization of Vanadium Resources Wuhan University of Science and TechnologyWuhan 430081China Hubei Provincial Engineering Technology Research Center of High Efficient Cleaning Utilization for Shale Vanadium Resource Wuhan University of Science and TechnologyWuhan 430081China

Separation of vanadium from black shale leaching solution at low pH is very meaningful,which can effectively avoid the generation of alkali neutralization slag and the resulting vanadium *** this study,coordination mechanism of vanadium in acid leaching solution at low pH was investigated with the intervention of chloride *** the conditions of pH 0.8,di-(2-ethylhexyl)phosphoric acid concentration of 20%,phase ratio of 1:2,and extraction time of 8 min,the vanadium extraction could reach 80.00%.The Fourier transform infrared and electrospray ionization results reveal that,despite the fact that the chloride ion in the leachate could significantly promote vanadium extraction,the chloride ion does not enter the organic phase,indicating an intriguing *** Cl^(-)-V,SO_(4)^(2-)-V,and H_(2)O-V,the V-Cl bond is longer and the potential difference between coordinate ions and vanadium is ***,Vo^(2+)gets easily desorbed with chloride ions and enter the organic *** the same time,the hydrogen ions of di-(2-ethylhexyl)phosphoric acid also enter the water phase more easily,which reduces the pH required for the extraction reaction.

关键词： vanadium black shale solvent extraction high acidity extraction

Separation of aluminum from rare earth by solvent extraction with 4-octyloxybenzoic acid

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Journal of Rare Earths 2023年第2期41卷 290-299页

作者： Gaoshan Yu Zhiyuan Zeng Yun Gao Shuainan Ni Hepeng Zhang Xiaoqi Sun CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Fujian Research Center for Rare Earth Engineering Technology Xiamen Institute of Rare Earth MaterialsHaixi InstituteChinese Academy of SciencesXiamen 361021China University of Chinese Academy of Sciences Beijing 100039China Jiangxi Province Key Laboratory of Cleaner Production of Rare Earths Ganjiang Innovation AcademyChinese Academy of SciencesGanzhou 341000China

Leaching method is usually used to extract rare earth(RE)elements from ion adsorbed RE *** the leaching process,some impurities such as aluminum(Al)enter the leaching *** separation of Al from RE by carboxylic acid extractant 4-octyloxybenzoic acid(POOA)was studied in this *** changing the pH value,temperature,solvent,saponification degree and other parameters,the extraction and separation performance of POOA in chloride system was systematically *** specific extraction experiments and slope analysis,it can be seen that the stoichiometric ratio of POOA to Al is 3:1during the extraction *** separation factor of Al^(3+)and Pr^(3+)can reach about *** with easily emulsified naphthenic acid,POOA achieves better phase *** above results show that saponified POOA(S-POOA)has a good separation effect on Al and *** the condition of low concentration stripping acid of 0.60 mol/L HCl,the developed extraction system can be almost completely stripped,and the stripping rate reaches 97.52%.The regenerated POOA can be directly used for the recycling extraction.

关键词： Rare earths Aluminium 4-octyoxybenzoic acid solvent extraction Separation

Predictive methods for density and refractive index of naphthenic lubricating oils during solvent extraction process

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Petroleum Science 2023年第3期20卷 1934-1946页

作者： Xiao-Ling Xu Tian-Qi Wang Guang-Huai Chen Jun-Wei Hou Yan-Sheng Liu State Key Laboratory of Heavy Oil Processing China University of Petroleum(Bejing)at KaramayKaramayXinjiang834000China State Key Laboratory of Heavy oil Processing China University of Petroleum(Bejing)Bejing102200China

Lubricating oils are usually produced by solvent extraction to separate aromatics in order to achieve the desired specifications and better quality *** the different properties of lubricating oils,density and refractive index are some of the most important properties which can both be used for petroleum fluid *** of density and refractive index for naphthenic oils during solvent extraction by DMSO obtained by the pseudo-component approach and the quadratic correlation were both *** pseudo-component approach is a method to predict density and refractive index from composition while the latter merely relates density to refractive *** indicated that the predictions yielded by the pseudo-component method were in good agreement with experimental data for naphthenic *** the use of a function of refractive index(FRI_(20))as a pseudo-component property remarkably improved n_(20)predictions for the naphthenic ***,the density and refractive index predictions obtained by the quadratic correlation exhibited significantly higher de-viations for naphthenic oils than those for paraffinic *** a new modified correlation of the same functional form was proposed for naphthenic *** modification significantly improved predictions for naphthenic oils,which presented similar accuracy as the pseudo-component *** the previous correlation was still used for paraffinic ***,effect of temperature on density and refractive index of naphthenic oils was *** showed that the modified quadratic correlation was accurate for describing the relationship between density and refractive index of naphthenic oils at 20-90℃.The temperature dependence of density and refractive index for the raffinates and the extracts could be accurately described by the thermal coefficients for saturates and aromatics,*** the refractive index variation of the extracts with temperature,the

关键词： Density Refractive index Pseudo-components Paraffinic lubricating oils Naphthenic lubricating oils solvent extraction

Simulation of solvent extraction for Naphthenic Lubricating Base Oils

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中国炼油与石油化工:英文版 2023年第3期25卷 153-164页

作者： Xu Xiaoling Wang Tianqi Tian Qingmei Liu Yansheng State Key Laboratory of Heavy Oil Processing China University of Petroleum(Beijing)at KaramayKaramay Xinjiang 834000China State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing 102200China

solvent extraction is the process of separating aromatics from vacuum distillates for the production oflubricating base oils. In this study, the authors use dimethyl sulfoxide (DMSO) instead of furfural as solvent, in light of itshigher selectivity, to obtain extracts with a high aromatic content for naphthenic lubricating base oils. We systematicallyinvestigated effects of the solvent-to-oil (S/O) ratio and extraction temperature on the yield of the extract, efficiency ofaromatic removal, and composition of the extracts and raffinates. The results showed that the aromatic content of extractsfor naphthenic oils could reach a high value of about 80%. The solvent maintained a high selectivity for aromatics fornaphthenic oils even under a high S/O ratio and a high extraction temperature. Moreover, the efficiency of aromatic removalfor naphthenic lubricating base oils could be enhanced by increasing either the S/O ratio or the extraction temperature,although these measures had limited effects in practice. Following this, we used the non-random two-liquid (NRTL) modelbased on the pseudo-component approach to simulate the liquid-liquid equilibrium of the system of DMSO + naphtheniclubricating base oils, and determined the parameters of binary interaction through regression based on the data on phaseequilibrium. The modeling results showed that the predicted yield, content of the solvent, and composition of the raffinatesand extracts were in good agreement with those obtained in the experiments. This validates the reliability of the model usedto represent the DMSO + naphthenic lubricating base oil system. Both the experimental data and the method of simulationreported here can help optimize the extraction of naphthenic lubricating base oils, and provide a better understanding of thecorresponding process.

关键词： solvent extraction naphthenic lubricating base oils liquid-liquid equilibrium thermodynamic model DMSO

solvent extraction of copper and ammonia from ammoniacal solutions using sterically hindered β-diketone

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Transactions of Nonferrous Metals Society of China 2010年第10期20卷 2026-2031页

作者：胡慧萍刘春轩韩雪涛梁啟文陈启元 School of Chemistry and Chemical Engineering Central South University

extraction of copper and ammonia from Cu2+-NH3-Cl--H2O solution using laboratorialy synthesized sterically hindered β-diketone(4,4-dimethyl-1-(4-dodecylphenyl)-1,3-pentanedione) was *** effects of the copper concentration,the total ammonia concentration,the initial pH in the aqueous phase,the phase ratio,and the temperature on copper extraction ratio and ammonia extraction in loaded organic phase were investigated using this sterically hindered β-*** the conditions of temperature 25℃,contact time of two phases 30 min,phase ratio 1-1,concentration of copper 3 g/L,concentration of total ammonia 3 mol/L,aqueous pH 8.43,and the concentration of β-diketone in organic phase 20%(volume fraction),ammonia in aqueous phase is much lower to be extracted by organic phase(just 14.5 mg/L),while the extraction rate of copper is 95.09%.

关键词： ammoniacal solution 4, 4-dimethyl-1-(4-dodecylphenyl)-1, 3-pentanedione copper solvent extraction

solvent extraction-separation of La(III),Eu(III) and Er(III) ions from aqueous chloride medium using carbamoyl-carboxylic acid extractants

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Journal of Rare Earths 2016年第1期34卷 91-98页

作者： Reyhaneh Safarbali mohammad reza yaftian abbasali zamani Phase Equilibria Research Laboratory Department of Chemistry Faculty of Science University of Zanjan 45371-38791 Zanjan Iran Department of Environmental Science Faculty of Science University of Zanjan 45371-38791 Zanjan Iran

N,N-dibutyldiglycol amic acid （HL1） and N,N-dioctyldiglycol nmic acid （HLu） were synthesized and characterized by conventional spectroscopic methods. These molecules were examined as extractants for extraction-separation of La（Ⅲ）, Eu（Ⅲ） and Er（Ⅲ）, as representative ions of light, middle and heavy rare earths, from aqueous chloride solutions. The analysis of the extraction equilibria revealed that the extracted species of lanthanum and europium ions by both of the extractants had a 1：3 metal to ligand ratio It was suggested that erbium ions were extracted into the organic phase via the formation ofEr（LIor Ⅱ）2Cl complexes. The effect of the organic diluents on the extraction-separation efficiency of the studied rare earths by HLI and HLⅡ was investigated by comparing the results obtained in dichloromethane and carbon tetrachloride. Regardless to the diluent used, the order of selectivity presented by the investigated extractants was Er（Ⅲ）〉Eu（Ⅲ）〉La（Ⅲ）. It is noteworthy that, a significant enhancement in separation of the studied rare earths by the extractants was achieved in their competitive extraction experiments with respect to that obtained in single component extraction experiments. Applicability of the extractants for the removal of rare earth ions from spent Ni-MH batteries was tested by removal ofLa（Ⅲ）, Eu（Ⅲ） and Er（Ⅲ） ions from simulated leach solution of such batteries.

关键词： rare earths solvent extraction separation recovery amide-carboxylic acid ligands

solvent extraction of Alkaline Earth Metals with Alkylphosphorus Acids

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Chinese Journal of Chemical Engineering 2002年第1期10卷 25-32页

作者：许新朱屯 InstituteofProcessEngineering（formerlyInstituteofChemicalMetallurgy） ChineseAcademyofSciencesBeijing100080China

solvent extraction equilibria of four main alkaline earth metals(magnesium, calcium, strontium and barium) with di (2-ethylhexyl)phosphoric acid (DEHPA), 2-ethylhexyl phosphonic acidmono-(2-ethylhexyl) esters, di (2, 4, 4-tri-methylpentyl) phosphinicacid and IR spectra of the extracts have been studied. Theselectivity order is dependent on the e/r value and hydration energyof the metal ions. The minor shift of the P→O in IR absorption ofthe alkaline earth metal extracts indicates that the interactionbetween the metal ions and P→O is much weaker for alkaline earthmetals than for transitional metals.

关键词： solvent extraction alkaline earth metals di(2-ethylhexyl) phosphoricacid (DEHPA)

solvent extraction of rare earth ions from nitrate media with new extractant di-(2,3-dimethylbutyl)-phosphinic acid

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Journal of Rare Earths 2016年第7期34卷 724-730页

作者：王俊莲陈广徐盛明尹祉力张覃 Civil and Environmental Engineering School University of Science and Technology Beijing Institute of Nuclear and New Energy Technology Tsinghua University Mining College Guizhou University College of Chemistry and Chemical Engineering Shihezi University

As a relatively new extractant, di-（2,3-dimethylbutyl）-phosphinic acid （HYY-2） is more efficient to separate heavy rare earths Tm/Yb/Lu than Cyanex 272 and P507. In this paper, HYY-2 was synthesized in our lab, and the extraction equilibrium, thermodynamics and stripping acidity for La, Gd and Y, which stood for light rare earth elements （REE）, middle REE and heavy REE respectively, from nitrate media with this extractant were investigated. Meanwhile, extraction ability, capacity and stripping acidity of HYY-2 were investigated and compared with those of Cyanex 272 and P507. The separation performance for rare earth element couples Gd/Eu and Er/Y were also studied. Compared to Cyanex 272, it possessed higher extraction capacity; while compared with P507, it has lower stripping acidity. The maximum βGD/Eu 1.46 occurred at PHequilibrium=2.78 and the maximumβEr/Y was 1.47 when pHequilibrium= 2.01.

关键词： di-(2,3-dimethylbutyl)-phosphinic acid rare earth element solvent extraction separation

solvent extraction performance of Ce(Ⅲ) from chloride acidic solution with 2-ethylhexyl phosphoric acid-2-ethylhexyl ester(EHEHPA) by using membrane dispersion micro-extractor

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Journal of Rare Earths 2015年第10期33卷 1114-1121页

作者：侯海龙靖宇王月王运东徐建鸿陈晋南 School of Chemical Engineering and Environment Beijing Institute of Technology The State Key Laboratory of Chemical Engineering Department of Chemical Engineering Tsinghua University

By using membrane dispersion micro-extractor, Ce（IIl） solvent extraction experiments were conducted. Cerium chloride solution with certain acidity was used as aqueous phase and 2-ethylhexyl phosphoric acid-2-ethylhexyl ester （EHEHPA） kerosene solution as organic phase. The effects of system physicochemical properties and operational conditions, such as initial EHEHPA concentration, initial aqueous acidity, total flow rate and continuous phase flow rate, etc., on the extraction efficiency and the overall volume mass transfer coefficient were evaluated. As the total flow rate increased fi＇om 20 to 160 mL/min, the overall volume mass transfer coefficient was enhanced from 0.1 to 0.54 S1. Under the optimal conditions, the Ce（III） extraction efficiency could reach 99.92% in 2.98 s. A mathematical model was set up to predict the overall volume mass transfer coefficient, and the calculation results agreed well with the experimental results, most relative error was within ＋10%.

关键词： rare earths solvent extraction membrane dispersion overall volume mass transfer coefficient