Selectivity and equilibria in extraction with macrocycles in synergistic combination with organophilic acids
Reported here is the behavior of several organophilic macrocyclic polyethers (crown ethers) as coordinative extraction synergists in combination with (1) a long-chain neo carboxylic acid, (2) an alkyl phosphoric acid, and (3) an alkyl-aryl sulfonic acid. Selected combinations of these organophilic cation exchangers and macrocyclic coordinators were examined as extractants for alkali, akaline earth, and fist-row transition elements from nitrate systems. Both synergistic and antagonistic effects were produced. Macrocycles having a cavity size to fit the metal ion usually produced the largest synergistic effect; however, the nature of the substituents on the macrocyclic ring also has a strong effect on selectively. In general, alkali metal ions prefer to bond to benzo-substituted crown ethers while alkaline earth ion prefer to bond to cyclohexano-substituted ones. 14 refs., 8 figs.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 5658929
- Report Number(s):
- CONF-860921-3; ON: DE86008976
- Resource Relation:
- ISEC '86: international solvent extraction conference, Munich, F.R. Germany, 11 Sep 1986
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400105 -- Separation Procedures
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ALCOHOLS
ALKALI METALS
ALKALINE EARTH METALS
ELEMENTS
ESTERS
EXTRACTION
GLYCOLS
HDEHP
HYDROXY COMPOUNDS
METALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
ORGANIC POLYMERS
ORGANIC SULFUR COMPOUNDS
PHOSPHORIC ACID ESTERS
POLYETHYLENE GLYCOLS
POLYMERS
SEPARATION PROCESSES
SOLVENT EXTRACTION
SOLVENT PROPERTIES
SULFONIC ACIDS
SYNERGISM