21.
    发明专利
    未知

    公开(公告)号:DE3229026A1

    公开(公告)日:1984-02-09

    申请号:DE3229026

    申请日:1982-08-04

    Applicant: BASF AG

    Abstract: 1. A process for the preparation of 4,4-dimethyltetrahydrofuran-2,3-dione (I), wherein a dimethylpyruvate (II) is reacted with formaldehyde or a formaldehyde donor at 80-150 degrees C.

    22.
    发明专利
    未知

    公开(公告)号:DE59501599D1

    公开(公告)日:1998-04-16

    申请号:DE59501599

    申请日:1995-11-17

    Applicant: BASF AG

    Abstract: Prepn. of propan-1,2-diol (I) comprises catalytic hydrogenation of glycerol at elevated temp. and pressure. Glycerol contg. up to 20 wt.% water and a catalyst (II) are used. (II) contains 40-70 wt.% Co, 10-20 wt.% Cu, 0-10 wt.% Mn and 0-10 wt.% Mo and opt. up to 10 wt.% inorg. polyacid and/or heteropolyacid.

    25.
    发明专利
    未知

    公开(公告)号:DE3786220D1

    公开(公告)日:1993-07-22

    申请号:DE3786220

    申请日:1987-09-26

    Applicant: BASF AG

    Abstract: Continuous prodn. of aliphatic aldehyde and ketones of formula R1-CO-R2 (I) is carried out by oxidn. of an alcohol R1-CH(OH) -R2 (II) with O2 at elevated temp. and in the presence of a catalyst (III), where R1=a satd., or unsatd., linear or branched aliphatic gp. with at least 2C, which can be substd. by alkyl, alkenyl or aryl, or a cycloaliphatic- aliphatic gp.; and R2=H, Me, Ar or as R1; or R1+R2 + the carbonyl C atom = a substd. or unsubstd. 4-12C membered ring, which can have one or more O atoms in the ring. The novel features are that (a) oxidn. is carreid out in a tubular reactor or tube aggregate with tube(s) having an inside dia. of 10-50 mm, (b) the tube(s) is charged with (III) in the form of granular inert material coated with 0.1-20 wt.% Cu, Ag and/or Au; and (c) the ratio of the dia. of the (III) granules to the inside dia. of the tube is 1:10-5.

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