中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

63 records (took 0.021 seconds)

    1.
    发明专利
    未知

    公开(公告)号：DE59300575D1

    公开(公告)日：1995-10-19

    申请号：DE59300575

    申请日：1993-03-27

    Applicant: BASF AG

    Inventor： KIEFER HANS DR ,  HUPFER LEOPOLD DR ,  LIPPERT FERDINAND DR

    IPC: C07C51/02 ,  C07C53/02

    Abstract: A process for preparing formic acid by thermal cleavage of quaternary ammonium formates of the general formula I (* CHEMICAL STRUCTURE *) (I) where R1, R2 and R3 are C1- to C14-alkyl, C3- to C8-cycloalkyl, aryl or C7- to C16-aralkyl, or together are 1,4- or 1,5-alkylene which is unsubstituted or substituted one to four times by C1-to C4-alkyl, with the proviso that the sum of the carbon atoms of R1, R2 and R3 in the quaternary ammonium formates I is 7 to 40, comprises carrying out the cleavage in the presence of secondary formamides of the general formula II (* CHEMICAL STRUCTURE *) (II) where R4 and R5 are C2- to C10-alkyl, C3- to C8-cycloalkyl, aryl or C7- to C16-aralkyl, or together are 1,4- or 1,5-alkylene which is unsubstituted or substituted one to four times by C1- to C4-alkyl, which formamides boil 30 degrees to 150 degrees C. lower than the tertiary amine of the general formula III (* CHEMICAL STRUCTURE *) (III) where R1, R2 and R3 have the abovementioned meanings, contained in the formate I.

    2.
    发明专利
    未知

    公开(公告)号：DE2407157A1

    公开(公告)日：1975-09-11

    申请号：DE2407157

    申请日：1974-02-15

    Applicant: BASF AG

    Inventor： HOHENSCHUTZ HEINZ DR ,  STROHMEYER MAX DR ,  RAUCH KONRAD DR ,  HESSE DIETER DIPL ING ,  KIEFER HANS DR

    IPC: C07C53/02 ,  C07C51/00 ,  C07C51/44 ,  C07C67/00 ,  C07C51/46

    Abstract: Formic acid is isolated from mixtures containing formic acid, methyl formate, methanol and water by fractional distillation, the mixture being fed into the upper half of the distillation column and 5 to 15 theoretical plates being maintained above the feed point and 10 to 25 theoretical plates below the feed point. The formic acid is withdrawn at the bottom end of the column as an azeotrope with water, the azeotrope being in the liquid state or preferably in the vapor state.

    5.
    发明专利
    未知

    公开(公告)号：DE4208477A1

    公开(公告)日：1993-09-23

    申请号：DE4208477

    申请日：1992-03-17

    Applicant: BASF AG

    Inventor： GRAFEN PAUL DR ,  KIEFER HANS DR ,  JAEDICKE HAGEN DR

    IPC: B01J31/04 ,  C07B61/00 ,  C07D311/72

    Abstract: A process for producing dl- alpha -tocopherol or dl- alpha -tocophenyl acetate by acid-catalysed reaction of 2,3,5-trimethyl hydroquinone (TMH) with phytol or isophytol in a solvent at high temperature and, where appropriate, the subsequent esterification of the tocopherol obtained with acetanhydride. The process is characterized by the fact that the reaction takes place in the presence of a mixture of ortho-boric acid and certain aliphatic di- or tri-carboxylic acids, preferably in the presence of a mixture of ortho-boric and oxalic acids.

Patent Agency Ranking