| 摘要 |
PROBLEM TO BE SOLVED: To provide an economical and industrial method for producing 2,2,6,6- tetramethyl-4-piperidone having purity of 99.5% or more. SOLUTION: The method for producing 2,2,6,6-tetramethyl-4-piperidone is characterized by that it comprises the following steps: (1) the first step in which a reaction mixture is separated in a low-boiling separating distillation column to a top distillate containing acetone as a main component and a bottom solution containing 2,2,6,6-tetramethyl-4-piperidone; (2) the second step in which the bottom solution of the low-boiling separating distillation column is separated in a high-boiling separating distillation column to a top distillate containing 2,2,6,6-tetramethyl-4-piperidone as a main component and a bottom solution containing components having higher boiling point that 2,2,6,6-tetramethyl-4- piperidone; and (3) the third step in which the top distillate of the high-boiling separating distillation column is fed to a refining distillation column and the vapor of 2,2,6,6-tetramethyl-4-piperidone is extracted from the middle section of the refining distillation column. COPYRIGHT: (C)2003,JPO
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