Extraction of Tungsten with Trialkylamine- Effect of pH.

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985858%3A_____%2F01%3A27013040" target="_blank" >RIV/67985858:_____/01:27013040 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Extraction of Tungsten with Trialkylamine- Effect of pH.

Popis výsledku v původním jazyce

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 andpresaturated 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 anionexchange, 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 charge

Název v anglickém jazyce

Extraction of Tungsten with Trialkylamine- Effect of pH.

Popis výsledku anglicky

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 andpresaturated 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 anionexchange, 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 charge

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CI - Průmyslová chemie a chemické inženýrství

OECD FORD obor

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Projekt

<a href="/cs/project/GA104%2F98%2F1440" target="_blank" >GA104/98/1440: Extrakce molybdenu a wolframu terciálními aminy</a><br>

Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2001

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Collection of Czechoslovak Chemical Commmunications

ISSN

0010-0765

e-ISSN

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Svazek periodika

66

Číslo periodika v rámci svazku

9

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

13

Strana od-do

1407-1419

Kód UT WoS článku

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EID výsledku v databázi Scopus

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