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    12.
    发明专利
    未知

    公开(公告)号：BG26667A3

    公开(公告)日：1979-05-15

    申请号：BG2041572

    申请日：1972-05-06

    Applicant: STAMICARBON

    Inventor： DE ROOIJ A H

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

    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.

    16.
    发明专利
    未知

    公开(公告)号：DD96236A5

    公开(公告)日：1973-03-12

    申请号：DD16281772

    申请日：1972-05-05

    Applicant: STAMICARBON

    Inventor： DE ROOIJ A H

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

    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.

    17.
    发明专利
    未知

    公开(公告)号：FR2137622B1

    公开(公告)日：1979-08-24

    申请号：FR7216368

    申请日：1972-05-08

    Applicant: STAMICARBON

    Inventor： DE ROOIJ A H

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

    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.

    PROCESS FOR PREPARING AND RECOVERING LACTAMS
    19.
    发明专利
    PROCESS FOR PREPARING AND RECOVERING LACTAMS 未知

    公开(公告)号：GB1342460A

    公开(公告)日：1974-01-03

    申请号：GB2113572

    申请日：1972-05-05

    Applicant: STAMICARBON

    Inventor： DE ROOIJ A H

    IPC: C07D201/04 ,  C07D201/16 ,  C07D41/06 ,  C01B17/74

    Abstract: 1342460 Oleum STAMICARBON NV 5 May 1972 [7 May 1971 3 Nov 1971] 21135/72 Heading C1A [Also in Division C2] Oleum is synthesized from an SO 2 -containing gas obtained by thermally decomposing an aqueous solution comprising ammonium sulphate and sulphuric acid which solution is itself obtained as by-product in the preparation of a lactum. The SO 2 -containing gas (e.g. comprising SO 2 , H 2 O, O 2 , CO 2 and N 2 ) may be cooled directly or indirectly to reduce the H 2 O content such that the SO 2 /H 2 O molar ratio is greater than unity. Oleum containing >20% by weight of free SO 3 is specified.

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