| 摘要 |
PROBLEM TO BE SOLVED: To efficiently separate a lactam in an amide by the coexistence of an amine with an equimolar amount or more of hydrogen chloride. SOLUTION: When the number of mol of an N,N-disubstituted amide such as N,N-dimethylformamide is A, the number of mol of hydrogen chloride is X and the number of mold of a lactam such asε-caprolactam is B, the hydrogen chloride is made to coexist in a number of mol satisfying the relationship of the formula A<=X, preferably the formula A<=X<A+2B, more preferably the formulae A<=X<A+B and 1.1×(A+B)<X<A+2B. Thereby, the lactam in the amide is crystallized and separated.
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