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28 records (took 0.019 seconds)

    1.
    发明专利
    未知

    公开(公告)号：DE3800991A1

    公开(公告)日：1989-07-27

    申请号：DE3800991

    申请日：1988-01-15

    Applicant: BASF AG

    Inventor： WILLERSINN CARL-HEINZ DR ,  MARTAN HANS DR ,  KRABETZ RICHARD DR ,  ENGERT GERD-JUERGEN DR

    IPC: C07C57/05 ,  C07C51/00 ,  C07C51/25 ,  C07C57/055 ,  C07C67/00

    Abstract: A process for the manufacture of alpha , beta -monoolefinic unsaturated carboxylic acids containing 3 to 4 C atoms by gas phase oxidation of alkylenes containing 3 to 4 C atoms and the corresponding alpha , beta -monoolefinic unsaturated aldehydes using oxidic catalysts containing molybdenum and customary therefor in two oxidation steps at pressures from 0.5 to 10 bar, removal of the unsaturated carboxylic acids after the second oxidation step by absorption and return of unreacted starting substances, in which the pressure after the second oxidation step is adjusted to 0.3 to 1.0 bar.

    PROCESS FOR PREPARING ALKYL ESTERS OF (METH) ACRYLIC ACID
    7.
    发明专利
    PROCESS FOR PREPARING ALKYL ESTERS OF (METH) ACRYLIC ACID 未知

    公开(公告)号：MY157865A

    公开(公告)日：2016-07-29

    申请号：MYPI20060849

    申请日：2006-02-28

    Applicant: BASF AG

    Inventor： HABECK THORSTEN DR ,  RAUH ULRICH ,  FRIESE THORSTEN DR ,  MARTAN HANS DR

    IPC: C07C67/54

    Abstract: A PROCESS IS DESCRIBED FOR CONTINUOUSLY PREPARING ALKYL ESTERS OF (METH)ACRYLIC ACID BY REACTING (METH)ACRYLIC ACID AND ALKANOLS HAVING FROM 1 TO 5 CARBON ATOMS IN HOMOGENEOUS, LIQUID, SOLVENT-FREE PHASE AT ELEVATED TEMPERATURE AND IN THE PRESENCE OF AN ACIDIC ESTERIFICATION CATALYST, IN WHICH - THE (METH) ACRYLIC ACID, THE ALKANOL AND THE ACIDIC ESTERIFICATION CATALYST ARE FED TO A REACTION ZONE (5, 6), - A REACTION MIXTURE (21) IS DISCHARGED FROM THE REACTION ZONE (5: 6). AND IS INTRODUCED INTO A RECTIFICATION UNIT I AND SEPARATED BY ADDITION OF WATER INTO A TOP STREAM (23), COMPRISING THE ALKYL ESTER OF (METH)ACRYLIC ACID, AND A BOTTOM STREAM (22), AND - A SUBSTREAM OF THE BOTTOM STREAM (22) FROM THE RECTIFICATION UNIT I IS FED TO A RESIDUE DISSOCIATION UNIT IV, WHICH COMPRISES A DISSOCIATING BOILER (61). AND IS SEPARATED THEREIN INTO A TOP STREAM (29), WHICH IS RECYCLED INTO THE RECTIFICATION UNIT I AND A BOTTOM STREAM (40). WHICH IS REMOVED FROM THE SYSTEM, WHEREIN THE RESIDUE DISSOCIATION UNIT IV, AS WELL AS THE DISSOCIATING BOILER (61), FURTHER COMPRISES A RECTIFICATION COLUMN (62), THE WATER CONTENT OF THE LIQUID OBTAINED AT THE BOTTOMMOST STAGE THEREOF BEING LESS THAN 0.1% BY WEIGHT.

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