公开(公告)号：DE1223104B

公开(公告)日：1966-08-18

申请号：DES0074866

申请日：1961-07-17

Applicant: SNIA VISCOSA

Inventor： NOTARBARTOLO LUIGI ,  PASIN ALBERTO

IPC: D01F6/18

公开(公告)号：CA682343A

公开(公告)日：1964-03-17

申请号：CA682343D

Applicant: SNIA VISCOSA

Inventor： CICERI LUIGI ,  NOTARBARTOLO LUIGI

公开(公告)号：CA678064A

公开(公告)日：1964-01-14

申请号：CA678064D

Applicant: SNIA VISCOSA

Inventor： NOTARBARTOLO LUIGI ,  PASIN ALBERTO

公开(公告)号：CA660474A

公开(公告)日：1963-04-02

申请号：CA660474D

Applicant: SNIA VISCOSA

Inventor： MADERNO CESANO ,  MUENCH WERNER ,  SILVESTRI GIULIANA ,  NOTARBARTOLO LUIGI

公开(公告)号：CA755090A

公开(公告)日：1967-03-21

申请号：CA755090D

Applicant: SNIA VISCOSA

Inventor： MUENCH WERNER ,  NOTARBARTOLO LUIGI ,  RUOTI VINCENZO

公开(公告)号：CA741233A

公开(公告)日：1966-08-23

申请号：CA741233D

Applicant: SNIA VISCOSA

Inventor： PASIN ALBERTO ,  NOTARBARTOLO LUIGI

公开(公告)号：CA720827A

公开(公告)日：1965-11-02

申请号：CA720827D

Applicant: SNIA VISCOSA

Inventor： RUOTI VINCENZO ,  NOTARBARTOLO LUIGI ,  MUENCH WERNER

公开(公告)号：CA710840A

公开(公告)日：1965-06-01

申请号：CA710840D

Applicant: SNIA VISCOSA

Inventor： RUOTI VINCENZO ,  NOTARBARTOLO LUIGI

公开(公告)号：CA710838A

公开(公告)日：1965-06-01

申请号：CA710838D

Applicant: SNIA VISCOSA

Inventor： MESSINA GIUSEPPE ,  RUOTI VINCENZO ,  MUENCH WERNER ,  NOTARBARTOLO LUIGI

公开(公告)号：DE1189977B

公开(公告)日：1965-04-01

申请号：DES0082000

申请日：1962-10-11

Applicant: SNIA VISCOSA

Inventor： NOTARBARTOLO LUIGI ,  MESSINA GIUSEPPE ,  MUENCH WERNER ,  MADERNO CESANO ,  MATTONE ROBERTO

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

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.