用D2EHPA,PC88A和Cyanex 272的钠盐和它们的混合物分离Co(Ⅱ)、Ni(Ⅱ)

Ｋ． Ｓａｒａｎｇｉ,Ｂ． Ｐ． Ｒｅｄｄｙ和 Ｒ． Ｐ． Ｄａｓ进行了从浓度为１ｍｏｌ／Ｌ的氯化物溶液中溶剂萃取钴、镍的研究,使用的萃取剂为Ｃｙａｎｅｘ ２７２的钠盐,稀释剂为煤油,相改性剂为磷酸三丁酯（ＴＢＰ）。研究结果表明,钴、镍的萃取率随水相ｐＨ的升高而升高,随苹取剂Ｎａ－Ｃｙａｎｅｘ ２７２浓度的升高而升高;Ｎａ－Ｃｙａｎｅｘ ２７２对 Ｃｏ、Ｎｉ的 ｐＨ_(５０)值相差１．２５,说明有可能将二者分离;用斜率分析法分析ｌｏｇ Ｄ与１ｇ［萃取剂］的关系,发现为一条斜率约为２的直线,说明２ｍｏｌ的萃取剂…     

新型萃取剂Cyanex272在萃取分离稀土中的应用

通过新型萃取剂Ｃｙａｎｅｘ２７２同Ｐ２０４和Ｐ５０７的对比，揭示ｙａｎｅｘ２７２分离稀白的前景，并介绍了Ｃｙａｎｅｘ２７２萃取分离稀土的研究状况，在此基础上提出了几点建议。     

新型萃取剂Cyanex272在溶剂萃取稀土中的应用

通过新型萃取剂Ｃｙａｎｅｘ２７２同Ｐ２０４和Ｐ５０７的对比预示了Ｃｙａｎｅｘ２７２分离稀土的景，并介绍了近期Ｃｙａｎｅｘ２７２溶剂萃取分离稀土的研究动态，在此基础上提出几点建议。     

Cyanex 272在溶剂萃取分离钴镍中的研究与应用

评述了新型有机膦类萃取剂Ｃｙａｎｅｘ ２７２ 在钴镍溶剂萃取分离中的应用进展, 并与现行的有机磷类萃取剂进行了比较。     

Cyanex272在淀粉萃取分离钴镍中的研究与应用

评述了新型有机膦类萃取剂Ｃｙａｎｅｘ２７２在钴镍溶剂萃取分离中的应用进展,并与现行的有机磷类萃取剂进行了比较。     

新型萃取剂Cyanex 272在稀土溶剂萃取中的研究与应用

本文评述了近年来新型有机磷类萃取剂Ｃｙａｎｅｘ ２７２在稀土溶剂萃取中的研究与应用，并与现行的有机磷类稀土萃取剂进行了比较。     

新型萃取剂Cyanex272的制备及应用

概述了Ｃｙａｎｅｘ２７２新型萃取剂的制备方法及其在溶剂萃取中的应用     

新型萃取剂Cyanex272在液膜分离技术中的应用

介绍了新型磷类萃取剂Ｃｙａｎｅｘ２７２在液膜分离、预浓缩和提取金属离子中的应用，并提出了有关该项研究的看法。     

Cyanex272与HEHEHP混合体系萃取分离重稀土的研究

选定了ＨＥＨＥＨＰ与Ｃｙａｎｅｘ ２７２组成混合体系,确定了萃取体系的最佳组成,测定了该体系的萃取容量、反萃酸度以主相邻重稀土元素之间的分离系数,考察了体系萃取性能的主要影响因素。     

新萃取剂—MOC—100TD萃取分离铜镍的研究

本文研究了用新萃取剂ＭＯＣ－１００ＴＤ萃取分离铜、镍的条件，当萃取时间５ｍｉｎ、水相料液ｐＨ≤４０、萃取剂的浓度为１０％、反萃液中含Ｈ２ＳＯ４１６０ｇ／Ｌ时，可使Ｃｕ（Ⅱ）与Ｎｉ（Ⅱ）得到良好的萃取分离。文中还探讨了萃取机理。萃取１个Ｃｕ（Ⅱ）时需要二个ＭＯＣ－１００ＴＤ分子，并认为萃取配合物中有一个ＭＯＣ－４５与一个ＭＯＣ－５５ＴＤ分子。     

Solvent Extraction Separation and Recovery of Components from Scraps Containing Nickel and Cadmium

The solvent extraction separation of Cd²⁺ and Ni²⁺ by commercially available dialkyl-phosphoric (D2EHPA), phosphonic (PC-88A) and phosphinic acids (Cyanex 272) has been investigated. In each case cadmium is extracted at lower pH values than nickel. Under comparable conditions PC-88A and Cyanex 272 have an excellent ability to separate cadmium from nickel. The optimum pH ranges are 3.5-4.5 with PC-88A and 4.8-6.0 with Cyanex 272. The feasibility of cadmium-nickel separation by Cyanex 272 extractant have been tested in pilot-plant scale. Cadmium and nickel salt solutions have been recovered from solutions originating from the leaching of the electrode materials of Ni-Cd battery scraps. The nickel and cadmium salt solutions have further been processed to metal oxidehydrates which have been found in laboratory lists as suitable for production of negative and positive electrode materials of new Ni-Cd batteries.     

Establishment of human ovarian cancer cisplatin resistant cell line COC1/DDP and its mechanism of resistance

A new saponin named gypentonoside has been isolated from Gynostemma pentaphylum (Thunb) Makino, C54H88O21, mp 272-274 degrees C. Its structure was established on the basis of chemical and spectroscopic (IR, FAB-MS, UV, 1H-NMR, 13C-NMR, 2D-NMR) analyses.     

Mass transfer kinetics of yttrium(III) using a constant interfacial cell with laminar flow. Part II extraction with Cyanex 272

The yttrium(III) extraction kinetics and mechanism with bis-(2,4,4-trimethyl-pentyl) phosphinic acid (Cyanex 272, HA) dissolved in heptane have been investigated by constant interfacial cell with laminar flow. The data has been analyzed in terms of pseudo-first order constants. Studies on the effects of stirring rate, temperature, acidity in aqueous phase, and extractant concentration on the extraction rate show that the extraction regime is dependent on the extraction conditions. The plot of interfacial area on the rate has shown a linear relationship. This fact together with the strong surface activity of Cyanex 272 at heptane–water interfaces has made the interface the most probable location for the chemical reactions. The forward, reverse rate equations and extraction rate constant for the yttrium extraction with Cyanex 272 have been obtained under the experimental conditions. The rate-determining step has been also predicted from interfacial reaction models. The predictions have been found to be in good agreement with the rate equations obtained from experimental data, confirming the basic assumption that the chemical reaction is located at the liquid–liquid interface.     

Determination of optimum process conditions for the extraction and separation of zirconium and hafnium by solvent extraction

Taguchi's method was used to determine the optimum conditions for separation of zirconium from hafnium by solvent extraction. The experimental conditions were studied in the range of 0.1 to 2.0 M for three different acids and TBP, D2EHPA or Cyanex 272 as extractant. The optimum extraction of zirconium was 71% when 2.0 M nitric acid and Cyanex 272 were used. The optimum zirconium/hafnium separation was also achieved using this combination.     

不同萃取体系分离微生物浸出液中低含量镍钴

采用P507一Cyanex272混合萃取体系分离微生物浸出液中的镍钴,实验结果表明该体系具有较好的协萃效应.结合低含量镍钴的微生物浸出液体系高酸度、低钴镍比的特点,对比了P507、Cyanex272和P507-Cyanex272三种萃取体系对镍钴的萃取分离效果,确定了在初始pH值1.5~2.2、对应的平衡pH值4.00~5.25条件下P507-Cyanex272协萃体系有较好的镍钴分离效果.系统考察了室温28℃下协萃体系各影响因素对镍钴分离的影响,确定协同萃取的最佳工艺为:P507与Cyanex272摩尔比3:2,皂化率60%,萃取剂体积分数10%,有机相(由萃取剂与煤油组成)和水相体积比1:4.在此条件下钻的一级萃取率为99.16%,镍钻分离系数为932.59.      

Solvent extraction characteristics of thiosubstituted organophosphinic acid extractants

Organophosphorus reagents are well known in solvent extraction. Commercial operations for the separation of cobalt from nickel have been successfully carried out using organophosphoric, -phosphonic, and -phosphinic acid extractants. Two new reagents in this class are the mono and dithio analogs of the commercial dialkylphosphinic acid, Cyanex 272. The replacement of oxygen by sulfur in these reagents enables extraction to be carried out at much lower pH.Characterization of Cyanex 272, Cyanex 302 (bis-(2,4,4-trimethylpentyl)-thiophosphinic acid), and Cyanex 301 (bis-(2,4,4-trimethylpentyl)-dithiophosphinic acid) has been undertaken. A comparison of the solvent extraction behavior of metallurgically important first-row transition metal ions from acidic sulfate solution by these reagents is reported. Distribution coefficients shift to lower pH with increasing sulfur substitution and decreasing pK_a of the extractant, the greatest effect being observed for nickel. Stoichiometry of the extraction reactions, and the nature of the metal complexes formed have been determined using slope analysis techniques and spectroscopic measurements.     

Extraction technology of purification of sulfate nickel solutions of impurities with the use of dialkylphosphine acid

The data of laboratory investigations of the removal of impurities (Fe, Cu, Zn, Mg, Ca) from sulfate nickel solutions are presented. It is shown that Cyanex 272 [di(2,4,4-dimethylpenthyl)phosphinic acid] is the most efficient extractant. For two extraction steps by a nickel form of Cyanex 272 from a solution (after iron purification) that contained: Ni 120–130, Cu 0.8–1.0, Zn 3.0–4.0, Mg 1.5–2.0, Ca 0.4–0.8, and Fe 0.01–0.02 g/l, raffinates of the following composition are obtained: Ni 120–130, Cu, Zn, and Fe ≤ 2 × 10^?3 each, Mg ≤ 0.1, and Ca 0.2–0.3 g/l. Purification of raffinates of organic impurities (extractant, diluent) after extraction is performed on the DAK-activated charcoal. Reextraction of metals and, correspondingly, extractant regeneration, is easily performed by solutions of mineral acids (H₂SO₄ and HNO₃). Extraction of nickel from the solution at the extraction step is ≥99.8%.     

Extraction and Stripping of Ytterbium （Ⅲ） from H2SO4 Medium by Cyanex 923

Ytterbiumand other lanthanide oxides are widelyused in the preparation of optical glasses ,glass fibersfor optical purposes ,gasoline-cracking catalysts ,pol-ishing compounds and carbon arcs , and in the ironand steel industriestoremove sulfur ,carbon ,and oth-er electronegative elements fromiron and steel[1].Themain sources of ytterbiumand other heavy rare earthelements are monazite and bastnasite . Withincreasingdemand for rare earth elements ,the separation andpurification of these elements…