Flüssige Ionenaustauscher — I. Wesen und Anwendung

Häupke, Klaus; Wolf, F.

doi:10.1002/zfch.19640040903

Zeitschrift fuer Chemie

1964

DOI: 10.1002/zfch.19640040903

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Flüssige Ionenaustauscher — I. Wesen und Anwendung

Klaus Häupke¹,

F. Wolf²

Abstract: Die Bezeichnung „flüssige Ionenaustauscher”︁ hat sich in letzter Zeit für eine Gruppe ionenselektiver Extraktionsmittel eingeführt, die aus Lösungen von nicht wasserlöslichen ionogenen Verbindungen (langkettigen sauren Phosphorsäureestern oder langkettigen Aminen) in mit Wasser nicht mischbaren Lösungsmitteln be‐stehen. Sie eignen sich speziell zur Extraktion von Metallen zum Zweck der Gewinnung, Reinigung oder Trennung auf nassem Wege. Es wird ein Überblick über die bekanntgewordenen flüssigen Ionenaustausche… Show more

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1966

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Cited by 3 publications

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Liquid Ion‐Exchange Membranes (LIEMs) in Electrodialysis Processes

Noam

Marcus

1966

Israel Journal of Chemistry

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In a series of preliminary experiments it was shown that LlEMs can be substituted for solid membranes in the conventional electrodialysis process. A specific mass transfer was demonstrated, causing either an increase or a decrease in the concentration of aqueous salt solutions, depending on the experimental set-up. The liquid membranes tested were shown to be iori-permselecnve.Research in the field of liquid ion-exchanging membranes started as early as the beginning of the century [I], but it was not until 1953 that Bonhoeffer [2] showed the similarity between solid and liquid ion exchanging membranes. Systems in which an organic phase containing a liquid ion exchanger was in contact with aqueous solutions were studied mainly for the purpose of extracting certain ionic species into the organic phase [3] but also for measuring bi-ionic potentials [1], [4], [7], [9]. In 1964, Sollner [4] was able to show that a xylene solution of a commercial liquid ion exchanger could act as an ion-permselective membrane when separating two aqueous solutions of different constitutions.Tha aim of the present work is to study the properties of LIEMs, in the hope of shedding light upon the process taking place during electrodialysis in water desalination. Exchangers and solvents were therefore chosen so as to produce LIEMs approximating the functioning of solid ion exchange membranes, particular regard being paid to water impermeability, electrical conductance and ion permselectivity. Thus, the cationic exchanger tested (sodium-dinonylnaphthalenesulfonate, Na-DNNS), has negligible water solubility and is highly soluble in organic solvents. The anionic exchanger (trilaurylamine hydrochloride, TLA. HCI) has similar properties and, furthermore, can easily be purified. Nitrobenzene was chosen as solvent because of its high dielectric constant, which permitted the preparation of LIEMs with fair electrical conductivities, combined with a relatively low water solubility. Other workers had used TLA. HCI [5], Na-DNNS [6], or even a solution of Na-DNNS in nitrobenzene [7] for similar reasons. For the transfer experiments, an electrodialysis cell was built according to the following general scheme:

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Liquid Ion‐Exchange Membranes (LIEMs) in Electrodialysis Processes

Noam

Marcus

1966

Israel Journal of Chemistry

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Flüssige Ionenaustauscher. 2. Beobachtungen bei der Synthese von Di‐2‐äthylhexylphosphat

Häupke¹,

Wolf²

1966

J. Prakt. Chem.

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Bei der Synthese von Di‐2‐äthylhexylphosphat aus 2‐Äthylhexanol und POCl3 ergab sich eine Abhängigkeit der Zusammensetzung des aus Di‐2‐äthylhexylphosphat und dem Nebenprodukt Mono‐2‐äthylhexylphosphat bestehenden Endproduktes von der Dauer der gegenseitigen Einwirkung bei erhöhter Temperatur. Während die Gesamtausbeute an Ester durch ein Maximum läuft, schwankt das Verhältnis Mono‐ zu Di‐2‐äthylhexylphosphat periodisch.

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Chromatography in the study of coordination compounds in solution

Carunchio

Strazza²

1966

Chromatographic Reviews

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Flüssige Ionenaustauscher — I. Wesen und Anwendung

Cited by 3 publications

References 77 publications

Liquid Ion‐Exchange Membranes (LIEMs) in Electrodialysis Processes

Liquid Ion‐Exchange Membranes (LIEMs) in Electrodialysis Processes

Flüssige Ionenaustauscher. 2. Beobachtungen bei der Synthese von Di‐2‐äthylhexylphosphat

Chromatography in the study of coordination compounds in solution

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