Extraction properties of new aminophosphinoxide compounds

Extraction of Sc(III) ions by new a-aminomethylphosphinoxides was studied. Preliminary experiments with acid solutions allowed for selection of low-basicity compounds, which demonstrated a poor coefficient of the acids extraction. When applied for the aqueous solution of various salts, they appeared to be good extractants of Sc(III), Fe(III), Bi(III), In(III), and lanthanide ions in toluene and chloroform and discriminated ?o(II), Ni(II), Cu(II), alkaline, and alkaline-earth elements. Copyright © Taylor & Francis Group, LLC

Liquid extraction of some rare earth elements with aminomethylphosphine oxides

Methods were developed of the solvent extraction from aqueous solutions of hydrochloric, nitric, and perchloric acids of the triply charged ions of rare earth elements including samarium, lutetium, dysprosium, neodymium, and ytterbium, using as reagents the lipophilic aminomethylphosphine oxides containing two or four dialkylphosphinyl groups, and toluene, chloroform, and methylene chloride as the organic media. The study of the effect of concentration of mineral acids on the degree of metal extraction showed that the highest extraction efficiency of lanthanides is achieved with bis(dihexylphosphinylmethyl)octylamine (I) from perchloric media: extraction degree 80%, whereas extraction from the solutions in two other acids did not exceed 30%. It was shown that the highest selectivity was reached at the extraction of scandium in all the extraction systems. A possible mechanism of extraction is discussed. © 2012 Pleiades Publishing, Ltd

Synthesis, transport, and ionophore properties of α,ω- bisphosphorylated azapodands: IX. Extraction of metal ions with quasiliquid emulsions on the basis of N,N′-bis(dioctylphosphorylmethyl)-1,8-diamino-3, 6-dioxaoctane and acidic components

Processes of extraction of ions of the I-IV group metals from acidic water solutions with paraffin quasiliquid emulsions containing neutral phosphorylazapodand, bis(dioctylphosphorylmethyl)-1,8-diamino-3,6-dioxaoctane I, and acidic components, bispentadecylphosphoric II and hexadecylsulfonic acid III is studied. High effectiveness of extraction of metal ions with these extraction compositions is established. It significantly exceeds the effectiveness of liquid extraction in the same systems, especially of ions of the II group metals. The extraction of three-charged ions proceeds more effectively by the mixture of organophosphorus reagents I and II, than with the composition consisting of azapodand I and organosulfur acid III. © 2013 Pleiades Publishing, Ltd

МАЛООТХОДНАЯ ТЕХНОЛОГИЯ ПОЛУЧЕНИЯ ГЛИЦИДОЛА ПЕРОКСИДНЫМ МЕТОДОМ

A technological process of manufacturing glycidol designed for the production capacity of 10 thousand tons per year and consisting in the direct oxidation of allyl alcohol with an aqueous solution of hydrogen peroxide in the presence of nanostructured titanium silicate in methanol is proposed. Due to the exothermic process, the solvent is not only a homogenizer of the mixture of the initial reagents of the epoxy process - allyl alcohol and hydrogen peroxide ensuring their interaction on the surface of the solid catalyst: it also prevents overheating of the reaction mass. On the basis of the research trial of the process the optimal parameters of the process were determined: temperature 30-40 °C; pressure 0.25 MPa; the initial hydrogen peroxide : allyl alcohol ratio = 1:(3-4) mass., methanol concentration in the reaction mixture 12-13 mol/l. Hydrogen peroxide conversion is 98%, the yield of the glycidol - 94%, the selectivity is no less than 95%. The process includes three main stages: (1) raw materials preparation, (2) liquid-phase epoxidation of allyl alcohol, (3) distillation of the target product. The scheme involves recirculation of unreacted allyl alcohol and the solvent - methanol. The developed technological process provides the following indicators (per 1 t of commercial glycidol): consumption of allyl alcohol no more than 0.843 t; consumption of hydrogen peroxide no more than 0.50 t (calculated for 100% hydrogen peroxide); consumption of methanol is no more than 0.022 tons All the waste products correspond to the 3-rd or 4-th hazard class.Предложен технологический процесс получения глицидола, рассчитанный на производство мощностью 10 тыс. тонн в год и заключающийся в прямом окислении аллилового спирта водным раствором пероксида водорода в присутствии наноструктурированного силикалита титана в среде метанола. Ввиду экзотермичности процесса растворитель является не только гомогенизатором смеси исходных реагентов процесса эпоксидирования - аллилового спирта и пероксида водорода, обеспечивая их взаимодействие на поверхности твердого катализатора, но и препятствует перегреву реакционной массы. На основании исследовательских испытаний жидкофазного эпоксидирования аллилового спирта определены оптимальные параметры проведения процесса: температура 30-40 0С; давление 0.25 МПа; начальное массовое соотношение пероксид водорода:аллиловый спирт = 1:(3-4), концентрация метанола в реакционной смеси 12-13 моль/л. При этом степень превращения пероксида водорода составляет 98%, выход глицидола - 94%, селективность процесса - 95%. Процесс включает в себя три основных технологических стадии: (1) приготовление сырьевой смеси; (2) жидкофазное эпоксидирование аллилового спирта; (3) выделение целевого продукта. В схеме предусмотрена рециркуляция непрореагировавшего аллилового спирта, а также растворителя - метанола. Разработанный технологический процесс обеспечивает следующие показатели (в расчете на 1 т товарного глицидола): расход аллилового спирта - не более 0.843 т; расход пероксида водорода - не более 0.50 т (в пересчете на 100%-ый пероксид водорода); расход метанола - не более 0.022 т. Все отходы производства соответствуют 3 или 4 классу опасности

Solvent extraction of some trace metals and iron with N-octyl-N,N- bis(dihexylphosphinylmethyl)amine

The processes were studied of the solvent extraction of the ions of triply-charged trace elements including scandium, indium, gallium, and yttrium, as well as iron, with N-octyl-N,N-bis(dihexylphosphinylmethyl)amine solution in toluene, chloroform or methylene chloride from hydrochloric, nitric or perchloric acids aqueous solutions. The metals extraction dependence on the acid concentration showed that the best results were reached using perchloric acid. The calculation of partition coefficients of metals allowed us to reveal a high selectivity of the scandium extraction. The prospects of using the investigated bisphosphinylamine in the technology of extraction, concentration and separation of the trace metals ions was concluded. © Pleiades Publishing, Ltd., 2011

Solvent extraction of some trace metals and iron with N-octyl-N,N- bis(dihexylphosphinylmethyl)amine

The processes were studied of the solvent extraction of the ions of triply-charged trace elements including scandium, indium, gallium, and yttrium, as well as iron, with N-octyl-N,N-bis(dihexylphosphinylmethyl)amine solution in toluene, chloroform or methylene chloride from hydrochloric, nitric or perchloric acids aqueous solutions. The metals extraction dependence on the acid concentration showed that the best results were reached using perchloric acid. The calculation of partition coefficients of metals allowed us to reveal a high selectivity of the scandium extraction. The prospects of using the investigated bisphosphinylamine in the technology of extraction, concentration and separation of the trace metals ions was concluded. © Pleiades Publishing, Ltd., 2011

Solvent extraction of some trace metals and iron with N-octyl-N,N- bis(dihexylphosphinylmethyl)amine

The processes were studied of the solvent extraction of the ions of triply-charged trace elements including scandium, indium, gallium, and yttrium, as well as iron, with N-octyl-N,N-bis(dihexylphosphinylmethyl)amine solution in toluene, chloroform or methylene chloride from hydrochloric, nitric or perchloric acids aqueous solutions. The metals extraction dependence on the acid concentration showed that the best results were reached using perchloric acid. The calculation of partition coefficients of metals allowed us to reveal a high selectivity of the scandium extraction. The prospects of using the investigated bisphosphinylamine in the technology of extraction, concentration and separation of the trace metals ions was concluded. © Pleiades Publishing, Ltd., 2011

Liquid extraction of some rare earth elements with aminomethylphosphine oxides

Methods were developed of the solvent extraction from aqueous solutions of hydrochloric, nitric, and perchloric acids of the triply charged ions of rare earth elements including samarium, lutetium, dysprosium, neodymium, and ytterbium, using as reagents the lipophilic aminomethylphosphine oxides containing two or four dialkylphosphinyl groups, and toluene, chloroform, and methylene chloride as the organic media. The study of the effect of concentration of mineral acids on the degree of metal extraction showed that the highest extraction efficiency of lanthanides is achieved with bis(dihexylphosphinylmethyl)octylamine (I) from perchloric media: extraction degree 80%, whereas extraction from the solutions in two other acids did not exceed 30%. It was shown that the highest selectivity was reached at the extraction of scandium in all the extraction systems. A possible mechanism of extraction is discussed. © 2012 Pleiades Publishing, Ltd

Synthesis, transport, and ionophore properties of α,ω- bisphosphorylated azapodands: IX. Extraction of metal ions with quasiliquid emulsions on the basis of N,N′-bis(dioctylphosphorylmethyl)-1,8-diamino-3, 6-dioxaoctane and acidic components

Processes of extraction of ions of the I-IV group metals from acidic water solutions with paraffin quasiliquid emulsions containing neutral phosphorylazapodand, bis(dioctylphosphorylmethyl)-1,8-diamino-3,6-dioxaoctane I, and acidic components, bispentadecylphosphoric II and hexadecylsulfonic acid III is studied. High effectiveness of extraction of metal ions with these extraction compositions is established. It significantly exceeds the effectiveness of liquid extraction in the same systems, especially of ions of the II group metals. The extraction of three-charged ions proceeds more effectively by the mixture of organophosphorus reagents I and II, than with the composition consisting of azapodand I and organosulfur acid III. © 2013 Pleiades Publishing, Ltd