| 摘要 |
PURPOSE:To obtain the titled substance useful as a raw material for a monomer for improving high polymer compounds, drugs, agricultural chemicals, surface active agents, etc., together with lactic acid, by hydrolyzing an N-t- alkyllactamide with an alkali aqueous solution in a specific temperature range. CONSTITUTION:An N-t-alkyllactamide shown by the formula I (R is 4-22C t-alkyl) is hydrolyzed with an alkali aqueous solution at 130-220 deg.C (preferably at 150-190 deg.C), to give the titled substance together with lactic acid. A hydroxide of an alkaline (earth) metal such as Na, K, Ca, Ba, etc. is used as the alkali, and the concentration of the aqueous solution is preferably 7-45wt%. Since the alkali is consumed with formation of lactic acid, an amount of the alkali used is preferably 1.05-1.30mol based on 1mol raw material. The pressure in the reactor rises with advance of the reaction, but the reaction is continued for 3-15hr in the pressure state.
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