公开(公告)号：DK133150B

公开(公告)日：1976-03-29

申请号：DK356573

申请日：1973-06-27

Applicant: SNIA VISCOSA

Inventor： MATTONE R ,  SIOLI G ,  GIUFFRE L

IPC: B01D11/04 ,  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.

公开(公告)号：ZA734342B

公开(公告)日：1974-05-29

申请号：ZA734342

申请日：1973-06-26

Applicant: SNIA VISCOSA

Inventor： MATTONE R ,  SIOLI G ,  GIUFFRE L

IPC: C07D201/16 ,  B01D11/04 ,  C07D

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.

公开(公告)号：SE314665B

公开(公告)日：1969-09-15

申请号：SE1088762

申请日：1962-10-10

Applicant: SNIA VISCOSA

Inventor： MUENCH W ,  MATTONE R ,  NOTARBARTOLO L ,  MESSINA G

IPC: C07C51/265 ,  C07C51/42 ,  C07C51/46 ,  C07C63/06

Abstract: In the manufacture of purified benzoic acid from raw materials obtained by the oxidation of toluene, the raw material is treated with water in more than a sufficient amount to form an azeotrope mmixture with all the unreacted toluene, and the azeotrope and some of the excess water are then distilled off, preferably at a temperature above the boiling point of the azeotrope, e.g. at 90-95 DEG C. Preferably, the amount of water added is such that an aqueous solution of benzoic acid of 3-5% concentration is obtained after the toluene-water azeotrope and excess water have been distilled off, and the benzoic acid solution is then freed from resinous impurities by decantation, which may be repeated. Finally, the benzoic acid is crystallized and centrifuged. The mother liquor from the crystallization is used to scrub the toluene-water azeotrope, and the azeotrope is then passed to a separator from which toluene is returned to the oxidation vessel and the aqueous layer is returned to the still in which the azeotropic distillation is effected. The process is particularly applicable to the products obtained by oxidizing toluene with air at a raised temperature, e.g. 145 DEG C., in the presence of an oxidation catalyst, e.g. cobalt enanthate.