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    3.
    发明专利
    未知

    公开(公告)号：DE3603376A1

    公开(公告)日：1987-08-06

    申请号：DE3603376

    申请日：1986-02-05

    Applicant: BASF AG

    Inventor： STEINIGER MICHAEL DR ,  STROEFER ECKHARD DR

    IPC: C07D231/12 ,  C25B3/23 ,  C25B3/02 ,  C07D233/56

    Abstract: 1. A process for preparing a pyrazole of the general formula see diagramm : EP0237762,P5,F1 where R**1, R**2 and R**3 are each hydrogen, alkyl, cycloalkyl or aryl, which comprises electrochemically oxidizing a 2-pyrazoline of the general formula see diagramm : EP0237762,P5,F2 where R**1, R**2 and R**3 have the abovementioned meanings, in the presence of an ionic halide.

    DISTILLATIVE REMOVAL OF PURE TRIOXANE
    5.
    发明专利
    DISTILLATIVE REMOVAL OF PURE TRIOXANE 未知

    公开(公告)号：MY138442A

    公开(公告)日：2009-06-30

    申请号：MYPI20053647

    申请日：2005-08-04

    Applicant: BASF AG

    Inventor： SIEGERT MARKUS DR ,  LANG NEVEN DR ,  STROEFER ECKHARD DR ,  STAMMER ACHIM DR ,  FRIESE THORSTEN

    Abstract: THE PRESENT INVENTION RELATES TO A PROCESS FOR DISTILLATIVELY REMOVING PURE TRIOXANE FROM A FEEDSTREAM (I) COMPRISING TRIOXANE IN A PROPORTION OF AT LEAST 50% BY WEIGHT, BASED ON THE TOTAL WEIGHT OF THE FEEDSTREAM (I), AND ADDITIONALLY FORMALDEHYDE AND WATER, WHICH COMPRISES FEEDING THE FEEDSTREAM I AND A FURTHER AQUEOUS STREAM (II) WHICH DOES NOT CONTAIN ANY COMPONENTS EXTRANEOUS TO THE FEEDSTREAM TO A DIVIDING WALL COLUMN (TWK1) HAVING A DIVIDING WALL TW WHICH IS ARRANGED SUBSTANTIALLY PERPENDICULARLY AND DIVIDES THE COLUMN INTERIOR INTO A FEED REGION (A1), A WITHDRAWAL REACTION (B1), AN UPPER COMBINED COLUMN REGION (C1) AND A LOWER COMBINED COLUMN REGION (D1), AND DRAWING OFF FROM THE FIRST DIVIDING WALL COLUMN (TWK1) A BOTTOM STREAM (III) COMPRISING PURE TRIOXANE AND A SIDESTREAM (IV) AT THE WITHDRAWAL REGION (B1), COMPRISING PURE WATER.FIG. 1

    REMOVAL OF TRIOXANE FROM A TRIOXANE/FORMALDEHYDE/WATER MIXTURE BY MEANS OF PRESSURE-SWING RECTIFICATION
    6.
    发明专利
    REMOVAL OF TRIOXANE FROM A TRIOXANE/FORMALDEHYDE/WATER MIXTURE BY MEANS OF PRESSURE-SWING RECTIFICATION 未知

    公开(公告)号：MY137873A

    公开(公告)日：2009-03-31

    申请号：MYPI20045310

    申请日：2004-12-22

    Applicant: BASF AG

    Inventor： SIEGERT MARKUS DR ,  LANG NEVEN DR ,  STROEFER ECKHARD DR ,  STAMMER ACHIM DR ,  FRIESE THORSTEN ,  HASSE HANS PROF DR

    IPC: C07D323/06

    Abstract: A process for removing trioxane from a use stream I of formaldehyde, trioxane and water, by a) providing a use stream I of formaldehyde as the main component and trioxane and water as the secondary components, b) mixing the use stream I with a recycle stream VII to obtain a feed stream Ia, c) distilling the use stream Ia in a first distillation stage to obtain a stream II of formaldehyde as the main component and water as the secondary component, and a stream III of trioxane as the main component and water and formaldehyde as the secondary components, d) distilling the stream III in a second distillation stage having a pressure higher than in the first distillation stage, to obtain a stream IV of trioxane and a stream V of trioxane as the main component and water and formaldehyde as the secondary components, e) distilling the stream V in a third distillation stage to obtain a stream VI of water and the recycle stream VII of trioxane as the main component and water and formaldehyde as the secondary components.

    9.
    发明专利
    未知

    公开(公告)号：DE19804915A1

    公开(公告)日：1999-08-12

    申请号：DE19804915

    申请日：1998-02-07

    Applicant: BASF AG

    Inventor： STROEFER ECKHARD DR ,  JACOBS JAN ,  SEYFERT WILFRIED DR ,  SCHWARZ HANS VOLKMAR DR ,  SCHWEERS OLAF DR ,  SCHARR VOLKER ,  PENZEL ULRICH DR

    IPC: C07B61/00 ,  C07C209/78 ,  C07C211/45 ,  C07C211/50 ,  C07C263/10 ,  C07C265/14

    Abstract: The invention relates to a method for the production of methylenedi(phenylamine) by reacting aniline with formaldehyde in the presence of acid catalysts. The method is characterized in that aniline and optionally an acid catalyst are treated in a semi-continuos method; formaldehyde and optionally an acid catalyst are fed through a mixing organ in a circuit in which aniline, optionally an acid catalyst and optionally an already added formaldehyde are circulated and tempering the reaction mixture at a temperature of over 75 DEG C after feeding at least 50 % of the total amount of formaldehyde. The invention also relates to a method for the production of polyisocyanates by phosgenating the amines thus obtained and the polyisocyanates obtained according to this method.

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