カワムラ　クニオ   KAWAMURA Kunio   川村　邦男    所属   広島修道大学  人間環境学部    職種   教授
言語種別	英語
発行・発表の年月	2005/09
形態種別	学術論文
査読	査読有り
標題	Extraction of benzene and naphthalene carboxylic acids using quaternary ammonium salts as a model study for the separation of coal oxidation products
執筆形態	共著
掲載誌名	Sep. Sci. Tech.
掲載区分	国外
巻・号・頁	40(13),pp.2761-2771
担当範囲	Corresponding author
著者・共著者	◎Kunio Kawamura, Hideki Nagano, Akitsugu Okuwaki
概要	The ion-pair solvent extraction of benzene- and naphthalene-carboxylic acids has been investigated as a model study for the separation of coal oxidation products, which are formed by treatment with alkaline solutions at high temperatures. The extraction equilibrium constants (Kex) for benzoic acid etc. into chloroform were determined at 20 oC. The difference of Kex among the aromatic acids was sufficiently large for designing a separation method for these aromatic acids. It was unexpected that the extraction of dicarboxylic acids was slower than that of monocarboxylic acids, although the ion-pair formation of aromatic carboxylate ion with quaternary ammonium ion is normally considered as a diffusion control reaction in aqueous phase. Thus, this fact suggests that the phase transfer of the ion-pair from aqueous to organic phase is the rate-determining step.