公开(公告)号：US3912721A

公开(公告)日：1975-10-14

申请号：US37379973

申请日：1973-06-26

Applicant: SNIA VISCOSA

Inventor： MATTONE ROBERTO ,  SIOLI GIANCARLO ,  GIUFFRE LUIGI

IPC: B01D11/04 ,  C07D201/16

CPC classification number: C07D201/16

Abstract: A method is disclosed for recovering lactams from acidic reaction mixtures, the improvement consisting in the fact that the extractant is an alkylsubstituted phenol the alkyl chain of which contains at least three carbon atoms, the alkyl substituent being capable of imparting to the phenol a lipophilic character. Monosubstituted and disubstituted phenols, such as isopropyl phenols, sec. and tert. butyl phenols, sec. and tert. amylphenols, di-sec. amylphenols and di-tert. amylphenols are preferred.

Abstract translation: 公开了一种用于从酸性反应混合物中回收内酰胺的方法，其改进在于提取剂是其烷基链含有至少三个碳原子的烷基取代酚，烷基取代基能够赋予苯酚亲油性 。 单取代和二取代的酚，如异丙基苯酚， 和叔丁基。 丁基酚，秒 和叔丁基。 戊基酚，二 - 戊基酚和二叔丁基。 戊基酚是优选的。

公开(公告)号：US3904609A

公开(公告)日：1975-09-09

申请号：US38033273

申请日：1973-07-18

Applicant: SNIA VISCOSA

Inventor： MATTONE ROBERTO ,  SIOLI GIANCARLO ,  GIUFFRE LUIGI

IPC: B01D3/00 ,  B01D9/02 ,  C07D201/16

CPC classification number: C07D201/16

Abstract: A method for the preparation of pure lactam is disclosed wherein a primary solution of the lactam in an organic phenolic solvent is supplemented by a compound miscible with the solution which is compatible with the primary solvent and is a solvent for the primary solvent but not for the lactam and susceptible of giving rise to precipitation of the lactam, the lactam being then separated from the mixture of the primary solvent and the compound which is a solvent for said primary solvent.