公开(公告)号：IT7922250D0

公开(公告)日：1979-04-30

申请号：IT2225079

申请日：1979-04-30

Applicant: MILANO SNIA VISCOSA SOCIETA NA

Inventor： PAOLO SENNI ,  NANDO TODERI

IPC: C07D201/16

Abstract: A method for the purification of raw caprolactam containing primary amides of the formula (I) wherein R is a hydrocarbon radical having 1-14 carbon atoms is described. The raw caprolactam is treated with at least one compound containing at least one hydroxyl group, in an amount of at least 20% by weight with respect to the raw caprolactam, at a temperature equal to or higher than that at which the ammonia, which is a part of the amide of formula I, is liberated. The caprolactam is then separated and isolated from the hydroxyl containing compound by known methods.

公开(公告)号：IT7924653D0

公开(公告)日：1979-07-25

申请号：IT2465379

申请日：1979-07-25

Applicant: SNIA VISCOSA

Inventor： PAOLO SENNI ,  MARIO CATONI ,  DOMENICO ASTARITA

IPC: C07C20060101 ,  C07C

公开(公告)号：IT7922355D0

公开(公告)日：1979-05-04

申请号：IT2235579

申请日：1979-05-04

Applicant: SNIA VISCOSA

Inventor： PAOLO SENNI ,  DOMENICO ASTARITA

IPC: C07D201/16 ,  C07D

Abstract: A method for purifying raw caprolactam containing, as impurities, primary amides of the formula (I) R being a hydrocarbon radical having 1-14 carbon atoms, and other by-products is described. The operations, carried out in the following order, consist in (a) treating a solution of raw caprolactam in a water insoluble organic solvent with water to extract most of the caprolactam in purified form, (b) separating the aqueous caprolactam solution and isolating the caprolactam, (c) treating the remaining organic solution with mineral acid to cause the formation of two phases, (d) separating these phases into a heavy phase containing the mineral acid, dilution water and most of the amides and by-products and a light phase containing the organic solvent and any residual amides and by-products, and (e) preferably recycling the light phase to (a). Further object of the invention is the purified caprolactam thus obtained.