About: Extraction of Tungsten with Trialkylamine- Effect of pH.

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	Extraction equilibrium in the system aqueous solution of sodium tungstate-solution of trialkylamine in a mixed diluent was investigated. A tertiary amine with C-7-C-9 straight alkyl chains was dissolved in a mixture of tributyl phosphate and kerosene and presaturated with sulfuric acid to give normal trialkylamine sulfate. Extraction isotherms at 25 degreesC and at several constant values of equilibrium pH were measured in a broad range of aqueous tungstate concentrations. pH 2.0-6.0 was adjusted by addition of sulfuric acid during equilibration. The equilibrium tungstate and sulfate contents in both phases were determined. A typical tungstate isotherm exhibits a steep ascending part in the low concentration range, corresponding to the region of anion exchange, and a flat part in the high concentration range, where the acid content in the organic phase is virtually exhausted. The level of the flat part decreases with growing pH, corresponding to the increasing number of negative charges per tungsten a Extraction equilibrium in the system aqueous solution of sodium tungstate-solution of trialkylamine in a mixed diluent was investigated. A tertiary amine with C-7-C-9 straight alkyl chains was dissolved in a mixture of tributyl phosphate and kerosene and presaturated with sulfuric acid to give normal trialkylamine sulfate. Extraction isotherms at 25 degreesC and at several constant values of equilibrium pH were measured in a broad range of aqueous tungstate concentrations. pH 2.0-6.0 was adjusted by addition of sulfuric acid during equilibration. The equilibrium tungstate and sulfate contents in both phases were determined. A typical tungstate isotherm exhibits a steep ascending part in the low concentration range, corresponding to the region of anion exchange, and a flat part in the high concentration range, where the acid content in the organic phase is virtually exhausted. The level of the flat part decreases with growing pH, corresponding to the increasing number of negative charges per tungsten a (en)
Title	Extraction of Tungsten with Trialkylamine- Effect of pH. Extraction of Tungsten with Trialkylamine- Effect of pH. (en)
skos:prefLabel	Extraction of Tungsten with Trialkylamine- Effect of pH. Extraction of Tungsten with Trialkylamine- Effect of pH. (en)
skos:notation	RIV/67985858:_____/01:27013040!RIV/2003/AV0/A27003/N
http://linked.open.../vavai/riv/strany	1407;1419
http://linked.open...avai/riv/aktivita	P Z
http://linked.open...avai/riv/aktivity	P(GA104/98/1440), Z(AV0Z4072921)
http://linked.open...iv/cisloPeriodika	9
http://linked.open...vai/riv/dodaniDat	2003
http://linked.open...aciTvurceVysledku	Volaufová, Eva Procházka, Jaroslav Voborská, Jitka Heyberger, Aleš Horáček, Jan Macháčková, Eva
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Ústav chemických procesů AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	680134
http://linked.open...ai/riv/idVysledku	RIV/67985858:_____/01:27013040
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	liquid-liquid extraction; ion-exchange; equilibrium (en)
http://linked.open.../riv/klicoveSlovo	equilibrium liquid-liquid extraction ion-exchange
http://linked.open...odStatuVydavatele	CZ - Česká republika
http://linked.open...ontrolniKodProRIV	[E52DEBD6473F]
http://linked.open...i/riv/nazevZdroje	Collection of Czechoslovak Chemical Commmunications
http://linked.open...in/vavai/riv/obor	CI
http://linked.open...ichTvurcuVysledku	6 (xsd:int)
http://linked.open...cetTvurcuVysledku	6 (xsd:int)
http://linked.open...ocetUcastnikuAkce	0 (xsd:int)
http://linked.open...nichUcastnikuAkce	0 (xsd:int)
http://linked.open...vavai/riv/projekt	Extraction of molybdenum and tungstan by tertiary amines
http://linked.open...UplatneniVysledku	2001
http://linked.open...v/svazekPeriodika	66
http://linked.open...iv/tvurceVysledku	Horáček, Jan Macháčková, Eva Procházka, Jaroslav Heyberger, Aleš Volaufová, Eva Voborská, Jitka
http://linked.open...n/vavai/riv/zamer	Theoretical fundamentals of chemical processes: equilibrium and dynamic behavior of multiphase reacting systems
issn	0010-0765
number of pages	13 (xsd:int)

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