METHOD FOR PRODUCING epsilon-CAPROLACTAM

摘要

PROBLEM TO BE SOLVED: To provide a method for producingε-caprolactam in which adhesion of scaling to an agitating rod is suppressed and crystallization is industrially continuously carried out when obtaining high-quality lactam by purifying a crudeε-caprolactam by a crystallization method. SOLUTION: The method for producingε-caprolactam comprises introducing a crudeε-caprolactam together with a mixed solvent of n-heptane with cyclohexane in a liquid phase state into a container equipped with an agitating means composed of agitating blades and an agitating rod for rotating and driving the agitating blades and crystallizingε-caprolactam while agitating. The surface of the agitating rod is composed of a buffed-finish stainless steel or a fluororesin. COPYRIGHT: (C)2009,JPO&INPIT