61.
    发明专利
    未知

    公开(公告)号:ES2116791T3

    公开(公告)日:1998-07-16

    申请号:ES96100461

    申请日:1996-01-13

    Applicant: BASF AG

    Abstract: In the sepn. of (meth)acrylic acid (I) from mixts. contg. (I) as main prod. and lower aldehydes as by-prods. by rectification in a column with a distn. zone and a concn. zone, the mixt. is not supplied to the column directly. Instead, it is passed to a heated dwell vessel connected to the concn. zone, in which the mixt. is kept boiling, and the sump liquid from this vessel is fed to the column.

    67.
    发明专利
    未知

    公开(公告)号:DE4132263A1

    公开(公告)日:1993-04-01

    申请号:DE4132263

    申请日:1991-09-27

    Applicant: BASF AG

    Abstract: A method for the catalytic gas-phase oxidation of acrolein to acrylic acid in a contact tubular solid bed reactor at elevated temperature on catalytically active oxides with a conversion of the acrolein on a single pass of >/= 95%, in which the reaction temperature in the flow direction along the contact tube in a first reaction zone from entry of the exit reaction gases containing the reactants into the contact tube until a conversion of the acrolein of 20 to 40% is achieved is 260 to 300 DEG C and in which subsequently thereto the reaction temperature is decreased abruptly or in successive steps or continuously along the contact tube until an acrolein conversion of >/= 95% is achieved by a total of 5 to 40 DEG C with the proviso that the reaction temperature in this second reaction zone is not less than 240 DEG C.

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