A special type of soap made from potassium salts of higher fatty acids. It is also called soft soap because it is soft and sticky. Soap is made by saponifying fats and oils with an alkali to produce glycerin and fatty acid alkali salts (soap), but regular soaps use sodium hydroxide as the alkali, and after the saponification reaction, the soap and glycerin are separated by salting out. In the case of potassium soap made with potassium hydroxide, salting out is difficult, so the soap is cooled and solidified while still mixed with glycerin. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
高級脂肪酸カリウム塩からなる特殊なセッケンの一つ。軟質でのり状を呈するので軟セッケンsoft soapともいう。セッケンは油脂をアルカリでケン化し,グリセリンと脂肪酸アルカリ塩(セッケン)としてつくられるが,一般のセッケンはアルカリとして水酸化ナトリウムを使用し,ケン化反応後,塩析してセッケンとグリセリンを分離する。水酸化カリウムを用いたカリセッケンの場合には塩析が困難であるため,グリセリンとの混合状態のまま冷却,固化させる。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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