Relationship between the solubility of water in organic solvents and the extraction equilibrium.

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  • 有機溶媒への水の溶解度と抽出平衡の相関性
  • ユウキ ヨウバイ エ ノ ミズ ノ ヨウカイド ト チュウシュツ ヘイコウ ノ ソウカンセイ

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Abstract

The ET values, which show the acceptability of solvents for a number of solvents saturated with water, were estimated and the solubility of water in these solvents were coulometrically measured using the Karl-Fischer method. The solvents were seven kinds of alkanes, three kinds of aromatic solvents, three kinds of chlorinated hydrocarbons, four kinds of esters, six kinds of ketones, and five kinds of alcohols. The ET values were found to correlate closely with the solubility of water in those solvents, expect for 1,2-dichloroethane. The solubility of water in some of these solvents was significantly interrelated with the various equilibrium constants in the extraction of copper (II) with decanoic acid using these solvents. It was suggested that the extraction is influenced by hydration. The solubility of water in the present solvents ranged widely from 2.36×10-3 to 4.74 mol dm-3 compared with the short range of the ET values. It is expected to be useful for investigating of solvent effects on the solvent extraction as a sensitive property for an organic solvent.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 51 (9), 759-765, 2002

    The Japan Society for Analytical Chemistry

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