Process for purifying caprolactam

Details Process for purifying caprolactam Process for purifying caprolactam

C - Chemistry, Metallurgy

07

D

260/241.95

C07D 223/10 (2006.01) C07D 201/16 (2006.01)

Patent

CA 1309404

ABSTRACT OF THE DISCLOSURE: The present invention relates to a process for purifying caprolactam (CL) obtained by Beckmann transposition or by nitrosation of cyclohexylic compounds, characterized in that it is performed in the following steps: (a) the caprolactam oil is treated with ammonia up to a pH comprised between 8 and 10 and at least one surface- active agent is added; (b) the caprolactam in aqueous- ammoniacal solution obtained in (a) is extracted with toluene; (c) the caprolactam in toluene solution according to (b) is extracted with water; (d) the product extracted in (c) is dehydrated by water distillation and is rectified in vacuum, in packed columns, with separation of the low- boiling and high-boiling byproducts in two successive phases; (e) the caprolactam obtained in (d) is treated with (a), an alkaline and/or alkaline-earth hydroxide, until an a/CL weight ratio comprised between 0.0125 and 0.100 equivalents of (a) per kg of CL is obtained, and is subsequently kept under mixing in an inert-gas atmosphere mixing for at least 150' at a temperature comprised between 80° and 160°C; (f) the mixture obtained in (e) is rectified in vacuum, obtaining pure caprolactam.

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