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    PREPARATION OF (METH)ACRYLIC ACID.
    71.
    发明专利
    PREPARATION OF (METH)ACRYLIC ACID. 未知

    公开(公告)号：MY118159A

    公开(公告)日：2004-09-30

    申请号：MYPI9804823

    申请日：1998-10-22

    Applicant: BASF AG

    Inventor： NESTLER GERHARD ,  HERBST HOLGER ,  HAMMON ULRICH DR

    IPC: C07C51/25 ,  C07C51/44 ,  C07C51/48 ,  C07C51/50 ,  C07C57/04 ,  C07C57/055 ,  C07C57/07 ,  C07C57/075

    Abstract: IN A PROCESS FOR THE PREPARATION OF (METH)ACRYLIC ACID FROM A MIXTURE WHICH CONTAINS (METH)ACRYLIC ACID AND A SOLVENT HAVING A BOILING POINT ABOVE THE BOILING POINT OF (METH)ACRYLIC ACID BY DISTILLATION OF THE MIXTURE IN A COLUMN WHICH IS CONNECTED TO AN EVAPORATOR AND HAS A STRIPPING SECTION AND A RECTIFYING SECTION, BETWEEN WHICH THE MIXTURE IS FED IN, AND A SIDE TAKE-OFF FOR THE (METH)ACRYLIC ACID, A POLYMERIZATIONINHIBITOR IS FED INTO THE COLUMN IN THE REGION OF THE TOP OF THE COLUMN AND IN THE REGION OF THE SIDE TAKE-OFF, THAT AMOUNT OF POLYMERIZATION INHIBITOR WHICH IS INTRODUCED IN THE REGION OF THE TOP OF THE COLUMN BEING SMALLER THAN THE AMOUNT INTRODUCED IN THE REGION OF THE SIDE TAKE-OFF.

    76.
    发明专利
    未知

    公开(公告)号：DE59600719D1

    公开(公告)日：1998-12-03

    申请号：DE59600719

    申请日：1996-01-04

    Applicant: BASF AG

    Inventor： HERBST HOLGER DR ,  NESTLER GERHARD DR ,  HAMMON ULRICH DR

    IPC: C07C57/04 ,  C07C51/44 ,  C07C57/05 ,  C07C57/07

    Abstract: In the sepn. of (meth)acrylic acid (I) from mixts. by rectification, in which (I) is discharged from the column at a point higher than the inlet for the mixt., the refluxing liq. is removed in at least one position of the column, the oligomerised and/or polymerised (I) is sepd. and the liq. is recycled to the column.

    78.
    发明专利
    未知

    公开(公告)号：DE59501356D1

    公开(公告)日：1998-03-05

    申请号：DE59501356

    申请日：1995-08-29

    Applicant: BASF AG

    Inventor： RUPPEL WILHELM DR ,  WEGERLE ULRIKE ,  TENTEN ANDREAS DR ,  HAMMON ULRICH DR

    IPC: B01J8/06 ,  B01J21/02 ,  B01J23/16 ,  B01J23/28 ,  C07B61/00 ,  C07C51/25 ,  C07C57/04 ,  C07C57/055

    Abstract: A process for the catalytic gas-phase oxidation of acrolein to acrylic acid in a multiple contact tube fixed-bed reactor through whose space surrounding the contact tubes only one heat-exchange medium circuit is passed, at elevated temperature on catalytically active multimetal oxides with an acrolein conversion for a single pass of >/=95 mol % and an acrylic acid formation selectivity of >/=90 mol %, which comprises firstly passing the heat-exchange medium through the multiple contact tube fixed-bed reactor longitudinally, considered over the reaction container as a whole, to the contact tubes in cocurrent to the reaction-gas mixture and secondly superposing a transverse flow within the reaction container by means of an arrangement of successive baffles along the contact tubes which leaves passage cross sections free, so as to give a meandrous flow of the heat-exchange medium, seen in longitudinal section through the contact tube bundle, and setting the flow rate of the circulated heat-exchange medium so that its temperature rises by from 2 DEG to 10 DEG C. between the point of entry into the reactor and the point of exit out of the reactor.

    79.
    发明专利
    未知

    公开(公告)号：ES2107887T3

    公开(公告)日：1997-12-01

    申请号：ES95113510

    申请日：1995-08-29

    Applicant: BASF AG

    Inventor： RUPPEL WILHELM DR ,  WEGERLE ULRIKE ,  TENTEN ANDREAS DR ,  HAMMON ULRICH DR

    IPC: B01J23/88 ,  B01J8/06 ,  B01J21/02 ,  B01J23/16 ,  B01J23/887 ,  B01J27/132 ,  B01J27/192 ,  C07B61/00 ,  C07C45/35 ,  C07C47/22

    Abstract: A gas-phase mixture of propene and oxygen is catalytically oxidized by passing a reactant gas mixture comprising propene and oxygen through a plurality of catalyst containing contact tubes in a fixed bed reactor and simultaneously passing only one heat-exchange medium at elevated temperature over the exterior surfaces of the contact tubes in a longitudinal flow pattern which is cocurrent with the direction of flow of the reactants through said tube; simultaneously superposing a transverse flow on said longitudinal flow of heat exchange medium by means of an arrangement of successive baffles along the contact tubes which leave passage cross-sections free, thereby resulting in a meandrous flow of the heat-exchange medium through the reactor and setting the flow rate of said heat-exchange medium so that its temperature between the point of entry of the medium into the reactor and its point of exit increases by 2 DEG to 10 DEG C.; and obtaining product acrolein at a selectivity >/=85 mol % from the reactor at a single pass propene conversion >/=90 mol %.

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