Solvent extraction equilibria of acids. VI. The extraction of several mono- and dicarboxylic acids with trioctylphosphine oxide in hexane.
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The solvent extraction equilibria of acetic, propionic, and butyric acid and mono-, di-, and trichloroacetic acid (HA), as well as those of oxalic, malonic, succinic, glutaric, and adipic acid (H<SUB>2</SUB>A), have been determined in liquid–liquid systems of hexane containing none or a certain amount of trioctylphosphine oxide (E) and an aqueous 1 mol dm<SUP>3</SUP> chloride solution at 25°C. The constants, <I>K</I><SUB>d</SUB>=[HA]<SUB>org</SUB>/[HA], <I>K</I><SUB>dim</SUB>=[(HA)<SUB>2</SUB>]<SUB>org</SUB>/[HA]<SUB>org</SUB><SUP>2</SUP>, <I>K</I><SUB>ex1</SUB>′=[HAE]<SUB>org</SUB>/[HA][E]<SUB>org</SUB>, <I>K</I><SUB>ex2</SUB>′=[H<SUB>2</SUB>AE<SUB>2</SUB>]<SUB>org</SUB>/[H<SUB>2</SUB>A][E]<SUB>org</SUB><SUP>2</SUP>, and β<SUB>1(org)</SUB>=[HAE]<SUB>org</SUB>/[HA]<SUB>org</SUB>[E]<SUB>org</SUB><SUP>2</SUP>, have then been determined from the data. It was found that, among the three fatty acids, the value of <I>K</I><SUB>ex1</SUB>′ was higher as the chain length increased, but the values of β<SUB>1(org)</SUB> were nearly all the same, while among the chloroacetic acids they were higher as the number of chloride atom increased. The extraction of the dicarboxylic acids with E was not very different, although the number of the –CH<SUB>2</SUB>– between the two carboxyl groups changed from zero to four.
- 公益社団法人 日本化学会の論文
著者
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Niitsu Masaru
Faculty Of Pharmaceutical Sciences Josai University
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Sekine Tatsuya
Departemnt of Chemistry, Science University of Tokyo
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