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    241.
    发明专利
    未知

    公开(公告)号：ES2098407T3

    公开(公告)日：1997-05-01

    申请号：ES92115903

    申请日：1992-09-17

    Applicant: BASF AG

    Inventor： FUCHS HUGO DR ,  NEUBAUER GERALD DR ,  RITZ JOSEF DR

    IPC: C07D201/04 ,  C07D201/06 ,  C07D223/10

    Abstract: Process for the production of caprolactam by Beckmann rearrangement of cyclohexanone oxime with oleum at a temperature of 85 to 125 DEG C in several successive rearrangement steps, characterised in that a part of the reaction mixture leaving the last rearrangement step is fed back to at least one of the preceding rearrangement steps.

    242.
    发明专利
    未知

    公开(公告)号：DE59208165D1

    公开(公告)日：1997-04-17

    申请号：DE59208165

    申请日：1992-09-17

    Applicant: BASF AG

    Inventor： FUCHS HUGO DR ,  NEUBAUER GERALD DR ,  RITZ JOSEF DR

    IPC: C07D201/04 ,  C07D201/06 ,  C07D223/10

    Abstract: Process for the production of caprolactam by Beckmann rearrangement of cyclohexanone oxime with oleum at a temperature of 85 to 125 DEG C in several successive rearrangement steps, characterised in that a part of the reaction mixture leaving the last rearrangement step is fed back to at least one of the preceding rearrangement steps.

    244.
    发明专利
    未知

    公开(公告)号：DE4132498A1

    公开(公告)日：1993-04-01

    申请号：DE4132498

    申请日：1991-09-30

    Applicant: BASF AG

    Inventor： FUCHS HUGO DR ,  NEUBAUER GERALD DR ,  RITZ JOSEF DR

    IPC: C07D201/04 ,  C07D201/06 ,  C07D223/10

    Abstract: Process for the production of caprolactam by Beckmann rearrangement of cyclohexanone oxime with oleum at a temperature of 85 to 125 DEG C in several successive rearrangement steps, characterised in that a part of the reaction mixture leaving the last rearrangement step is fed back to at least one of the preceding rearrangement steps.

    Crystalline silicate catalysts with deactivated outer surface - have pores blocked before contact with deactivation agent
    245.
    发明专利
    Crystalline silicate catalysts with deactivated outer surface - have pores blocked before contact with deactivation agent 未知

    公开(公告)号：NL8204836A

    公开(公告)日：1983-09-16

    申请号：NL8204836

    申请日：1982-12-15

    Applicant: STAMICARBON

    IPC: B01J29/06 ,  B01J29/40 ,  B01J29/86 ,  B01J37/30 ,  C07C2/00 ,  C07D201/06 ,  B01J29/38 ,  C07D201/04 ,  C07D223/10

    Abstract: Some or all the catalytically active sites on the external surfaces of crystalline aluminosilicate and/or borosilicate catalyst are deactivated by (a) making the pores inaccessible to deactivating agent; and (b) subsequently contacting with deactivating agent. Pref., the pores are made inaccessible by saturating the pore vol. of the silicate with an organic component which cannot mix with or dissolve in the deactivating agent, pref. an aromatic or alkylaromatic hydrocarbon, esp. toluene. The deactivating agent is pref. a soln. of alkali metal salt, esp. Na salt, in water, and contact is at 0-200 deg. C for at least 1/2 hr. The modified silicate so prepd. is claimed. A crystalline silicate having different catalytic properties on its external surface from the pore surfaces has (part of) the catalytically active sites on the external surface replaced by catalytically inactive alkali metal ions, esp. Na ions. The catalysts are useful in e.g. hydrocarbon conversions. Inactivation of external surfaces reduces pore blocking, giving a catalyst of increased life and selectivity.

    Oxime preparation
    250.
    发明专利
    Oxime preparation 未知

    公开(公告)号：GB1073248A

    公开(公告)日：1967-06-21

    申请号：GB5288564

    申请日：1964-12-30

    Applicant: STAMICARBON

    IPC: C07D201/06

    Abstract: Oximes are prepared by reacting carbonyl compounds with hydroxylammonium sulphate solution, obtained by reducing SO2 with nitritebisulphite solution, which contains such an amount of ammonium sulphate that during the reaction the medium is buffered at pH 1.5-3. The preparation of cyclohexanone oxime is exemplified.

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