| 摘要 |
PURPOSE:To obtain an aqueous solution of O-long chain acylisethionic acid or a paste, hardly causing turbidity, etc., useful for surfactants by reacting an isethionic acid with a fatty acid chloride obtained by reaction between carbonyl chloride and a fatty acid. CONSTITUTION:Firstly, a reaction is made pref. at 40-100 deg.C for ca.5hr between (A) a 8-20C saturated or unsaturated fatty acid such as lauric acid and (B) pref. 1.05-1.5 molar times, based on the component A, of carbonyl chloride in the presence of a solvent and/or catalyst, if needed, followed by complete degassing to obtain a fatty acid chloride of a high purity. Then, a further reaction is made between (1) one equivalent of this fatty acid chloride, (2) 0.5-1.5 equivalents of an isethionic acid such as sodium isethionate and (3) 1-4 equivalents of an alkali such as NaOH in a hydrous solvent such as acetone esp. pref. at -10 to 50 deg.C for ca.5hr, thus obtaining the objective aqueous solution or paste hardly causing turbidity and precipitation, usable as a raw material for surfactants without necessitating isolation thereof. |
