1 0 0 0 OA 起泡と消泡の試験法
- 著者
- 田村 隆光
- 出版者
- Japan Oil Chemists' Society
- 雑誌
- 油化学 (ISSN:18842003)
- 巻号頁・発行日
- vol.42, no.10, pp.737-745, 1993-10-20 (Released:2009-10-16)
- 参考文献数
- 49
- 被引用文献数
- 1 1
The existing test methods for measuring foaming and antifoaming properties of liquids are reviewed. The foaminess of liquids strongly depends on the test method. A number of methods cover most aspects of foam formation and stabilization. According to the principal of the foam generation, the foaming methods have been classified into two groups ; static and dynamic. The foam stability are expressed in terms of defined parameter such as the lifetime of bubbles, bubble size distribution and the gradual transformation of foam film caused by drainage.
1 0 0 0 OA 漂白剤による色素の退色機構 (第1報)
- 著者
- 田村 隆光 久保園 隆康 田村 勝 吉村 晴夫
- 出版者
- Japan Oil Chemists' Society
- 雑誌
- 油化学 (ISSN:18842003)
- 巻号頁・発行日
- vol.44, no.12, pp.1086-1092, 1995-12-20 (Released:2009-10-16)
- 参考文献数
- 21
- 被引用文献数
- 2 1
A pseudo-first-order reaction constants (kobs) of dyes having a single hydroxyl group inthe molecule (Orange I, Orange II) by various bleaching agents were measured as a function ofpH. Used bleaching agents were hydrogen peroxide, peracetic acid, potassium permonosulfate, and sodium hypochlorite. The kobs of each dye showed maximum at intermediate pH betweenan acid dissociation constant of bleaching agent (pKa) and an acid dissociation constant of dye (pKd). Distribution curves of kobs on pH showed symmetrical narrow distribution when the value of pKd was close to pKa, and symmetrical broad distribution when the value of pKd was far apart from pKa. These results were analyzed with reaction kinetics by assumming the ionic reaction among protonated and deprotonated form of the bleaching agents and the dyes. It wasproved that the distribution curves of kobs on pH follow the following equation.kobs= [A] t/ (1+ [H+] /Ka) (1+Kd/ [H+]) where [A] t is the total bleaching agent concentration, k1 is a second-order reaction constant byassuming the reaction between protonated dye ; [DyeH] and deprotonated bleaching agents ; [A-]. The calculated values obtained by above equation were in good agreement with the observed values. Therefore, it was concluded that the decoloration mechanism of the dyes by bleaching agents conforms to the ionic reaction among protonated and deprotonated forms of the bleaching agents and the dyes. We have named this decoloration mechanism as “the mutual ionic reaction mechanism”.