会合およびそれに対する希釈剤効果の過剰体積からの考察　　トリ‐ｎ‐オクチルアミンと低級脂肪酸系について

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  • Studies of the association mechanism and diluent effect using excess volume - Systems of tri-n-octylamine and lower carboxylic acids.
  • カイゴウ オヨビ ソレニ タイスル キシャクザイ コウカ ノ カジョウ タイセ
  • Systems of Tri-<I>n</I>-octylamine and lower carboxylic acids
  • トリ-<I>n</I>-オクチルアミンと低級脂肪酸系について

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To investigate the association mechanism of tri-n-octylamine (TOA) with organic acids as well as the diluent effect on the association equilibrium of the systems, excess volumes different (υE) of the mixtures of TOA with four lower carboxylic acids and mixtures of TOA and acetic acid with five different diluents were measured at 30°C. For the ternary mixtures, evaluation of the diluent effect was based on an approximation of the pseudo-binary mixture of TOA and acetic acid.<BR>The findings in the present investigation are as follows.<BR>1) For the binary and pseudo-binary mixtures, the composition (XBmin), which gives the minimum valume of υE varies according to the kinds of acids and diluents.<BR>2) The dominant associating species of TOA with an acid can be estimated from the XBmin. And the equilibrium constants of the association are obtainable from the model proposed in this study by fitting the observed υE values of the binary and pseudobinary mixtures.<BR>3) There is a significant relationship between XBmin and the acceptor number of the diluent. The stronger in acceptor characteristics the diluent is, the smaller the number of the acid associated with TOA becomes.

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