公开(公告)号：BE783100A

公开(公告)日：1972-11-06

申请号：BE783100

申请日：1972-05-05

Applicant: STAMICARBON

Inventor： DE ROOIJ A H

IPC: C07D201/04 ,  C07D201/16 ,  C07D

Abstract: A process for preparing and recovering lactams by the so-called Beckmann rearrangement of the corresponding ketoximes in a sulfuric acid medium is disclosed, wherein the mixture of lactam and sulfuric acid medium obtained from the Beckmann rearrangement is mixed with an aqueous solution of ammonium sulfate obtained as a by-product in the synthesis of hydroxylammonium sulfate in the preparation of said ketoximes. The lactam is then extracted from the resulting less acidic solution and the remaining acid solution, comprising an aqueous solution of ammonium hydrogen sulfate, is thermally decomposed to produce recoverable sulphur dioxide.

公开(公告)号：NL162375C

公开(公告)日：1980-05-16

申请号：NL7106341

申请日：1971-05-07

Applicant: STAMICARBON

Inventor： DE ROOIJ A H

IPC: C07D201/04 ,  C07D201/16 ,  C01B17/50

公开(公告)号：CH579539A5

公开(公告)日：1976-09-15

申请号：CH671872

申请日：1972-05-05

Applicant: STAMICARBON

Inventor： DE ROOIJ A H

IPC: C07D223/02 ,  C07D201/16

公开(公告)号：SE377334B

公开(公告)日：1975-06-30

申请号：SE606672

申请日：1972-05-08

Applicant: STAMICARBON

Inventor： DE ROOIJ A H

IPC: C07D201/04 ,  C07D201/16 ,  C07D295/02

Abstract: A process for preparing and recovering lactams by the so-called Beckmann rearrangement of the corresponding ketoximes in a sulfuric acid medium is disclosed, wherein the mixture of lactam and sulfuric acid medium obtained from the Beckmann rearrangement is mixed with an aqueous solution of ammonium sulfate obtained as a by-product in the synthesis of hydroxylammonium sulfate in the preparation of said ketoximes. The lactam is then extracted from the resulting less acidic solution and the remaining acid solution, comprising an aqueous solution of ammonium hydrogen sulfate, is thermally decomposed to produce recoverable sulphur dioxide.

公开(公告)号：BR7202828D0

公开(公告)日：1973-05-17

申请号：BR282872

申请日：1972-05-05

Applicant: STAMICARBON

Inventor： DE ROOIJ A H

IPC: C07D201/04 ,  C07D201/16 ,  C07D41/06

公开(公告)号：DD96234A5

公开(公告)日：1973-03-12

申请号：DD16281572

申请日：1972-05-05

Applicant: STAMICARBON

Inventor： DE ROOIJ A H

IPC: C07D223/02 ,  C07D201/16 ,  C07D41/06

公开(公告)号：FR2137622A1

公开(公告)日：1972-12-29

申请号：FR7216368

申请日：1972-05-08

Applicant: STAMICARBON

Inventor： DE ROOIJ A H

IPC: C07D201/04 ,  C07D201/16 ,  C07D41/00 ,  C07D29/00 ,  C07D27/00

Abstract: A process for preparing and recovering lactams by the so-called Beckmann rearrangement of the corresponding ketoximes in a sulfuric acid medium is disclosed, wherein the mixture of lactam and sulfuric acid medium obtained from the Beckmann rearrangement is mixed with an aqueous solution of ammonium sulfate obtained as a by-product in the synthesis of hydroxylammonium sulfate in the preparation of said ketoximes. The lactam is then extracted from the resulting less acidic solution and the remaining acid solution, comprising an aqueous solution of ammonium hydrogen sulfate, is thermally decomposed to produce recoverable sulphur dioxide.

公开(公告)号：NL7106343A

公开(公告)日：1972-11-09

申请号：NL7106343

申请日：1971-05-07

Applicant: STAMICARBON

Inventor： DE ROOIJ A H

IPC: C07D223/02 ,  C07D201/16 ,  C07D41/06

公开(公告)号：NL7106341A

公开(公告)日：1972-11-09

申请号：NL7106341

申请日：1971-05-07

Applicant: STAMICARBON

Inventor： DE ROOIJ A H

IPC: C07D201/04 ,  C07D201/16 ,  C07D41/06