中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

93 records (took 0.025 seconds)

    82.
    发明专利
    未知

    公开(公告)号：DK0992477T3

    公开(公告)日：2003-02-24

    申请号：DK99118458

    申请日：1999-09-17

    Applicant: BASF AG

    Inventor： THERRE JOERG DR ,  KAIBEL GERD DR ,  AQUILA WERNER DR ,  WEGNER GUENTER DR ,  FUCHS HARTWIG

    IPC: B01J27/16 ,  C07B61/00 ,  C07C41/28 ,  C07C43/15 ,  C07C45/37 ,  C07C45/51 ,  C07C45/54 ,  C07C45/67 ,  C07C47/21 ,  C07C49/203

    Abstract: Preparation of citral (I) comprises thermal decomposition of 3-methyl-2-buten-1-al-diprenylacetal and rearrangement of obtained intermediates cis/trans-prenyl-(methyl-butadienyl)-ether (IV) and 2,4,4-trimethyl-3-formyl-1,5-hexadiene (V). (IV) and (V) are continuously distilled off and converted into (I) before or after removal of by-product prenol. Preparation of 3,7-dimethyl-2,6-octadien-1-al (citral) of formula (I) comprises: (1) thermal decomposition of 3-methyl-2-buten-1-al-diprenylacetal of formula (II) optionally in the presence of an acid catalyst to split off 3-methyl-buten-1-ol (prenol) of formula (III) and form cis/trans-prenyl-(methyl-butadienyl)-ether of formula (IV); (2) Claisen rearrangement of (IV) to give 2,4,4-trimethyl-3-formyl-1,5-hexadiene of formula (V); and (3) Cope rearrangement of (V) to form (I). The transitionally formed (IV) and (V) and the desired citral as well as the prenol (III) are continuously distilled out of the reaction mixture and (IV) and (V), before or after distillative separation of (III) and optional by-products, are subjected to rearrangement to form (I) at 100-200 degrees C.

    84.
    发明专利
    未知

    公开(公告)号：DK0983988T3

    公开(公告)日：2002-03-25

    申请号：DK99117101

    申请日：1999-08-31

    Applicant: BASF AG

    Inventor： OOST CARSTEN DR ,  STROEZEL MANFRED ,  ETZRODT HEINZ DR ,  WELLER DIETMAR DR ,  BOCKSTIEGEL BERNHARD DR ,  REIMER KLAUS ,  KAIBEL GERD DR ,  JAEDICKE HAGEN DR

    IPC: B01J31/14 ,  B01D3/00 ,  B01D3/14 ,  B01D3/32 ,  B01J10/00 ,  B01J19/24 ,  C07B61/00 ,  C07C45/67 ,  C07C45/68 ,  C07C45/82 ,  C07C49/203 ,  C07C67/54 ,  C07C69/72

    Abstract: Continuous production of 5-alken-2-one or 3,5-alkadien-2-one derivatives (I) by reacting a 1-alken-3-ol or 1-alkyn-3-ol derivative (II) with an alkyl acetoacetate (III) in a fractionation column to form an acetoacetate and alcohol involves (i) removing the alcohol and (ii) contacting the acetoacetate with catalyst in the lower part or bottom of the column to form (I). Continuous production of unsaturated ketones of formula (I) by reacting an unsaturated alcohol of formula (II) with an alkyl acetoacetate of formula (III) in the presence of an organoaluminum catalyst is carried out by: (a) reacting (II) with (III) on the plates of a fractionation column to form the acetoacetate of (II) and an alcohol of formula R OH; (b) removing the alcohol in the overhead stream from the column; (c) contacting the acetoacetate of (II) with the catalyst in the lower part or bottom of the column to form (I) and CO2; (d) removing the CO2 in the overhead stream from the column; and (e) withdrawing (I) in the bottoms stream from the column. R = 1-4C alkyl; R = 1-37C (un)saturated aliphatic hydrocarbyl (optionally substituted by methoxy groups), 4-12C cycloalkyl or 5-30C cycloalkylalkyl; and R = 1-5C alkyl.

    86.
    发明专利
    未知

    公开(公告)号：DE19646679A1

    公开(公告)日：1998-05-14

    申请号：DE19646679

    申请日：1996-11-12

    Applicant: BASF AG

    Inventor： BROECKER FRANZ JOSEF DR ,  AQUILA WERNER DR ,  FLICK KLEMENS DR ,  KAIBEL GERD DR ,  LANGGUTH ERNST DR

    IPC: B01J23/44 ,  B01J27/057 ,  B01J35/10 ,  C07B35/08 ,  C07B61/00 ,  C07C29/56 ,  C07C33/03 ,  C07C41/32 ,  C07C43/15 ,  C07C67/293 ,  C07C69/145 ,  C07C33/025

    Abstract: A solid bed catalyst containing either palladium and selenium and/or tellurium on a silica carrier, has a BET surface area of 80-380 m /g, a pore volume of 0.6-0.95 cm /g and a pore diameter of 3 nm to 300 mu m. The proportion of the pore volume with a pore diameter of 10-100 nm is 80-95%. Also claimed are: (i) the preparation of the above catalyst; and (ii) the preparation of 2-buten-1-ol compounds of formula H2R1C-R2C=CR3-CR4R5-OR6 (I) by isomerising 3-buten-1-ol compounds of formula HR1C=CR2-CHR3-CR4R5-OR6 (II) in the presence of hydrogen and the catalyst. In the formulae: R1-R6 = H or aliphatic group (optionally substituted with OH, OR, halogen or carboxyl), or R2 may also be -CHO, or R2 and R5 can combine with the C atoms between them to form an alicyclic ring, or R6 can also be a cycloaliphatic, arylaliphatic or aromatic group or a group of formula C(=O)-R7; R = aliphatic group; and R7 = aliphatic, cycloaliphatic, arylaliphatic or aromatic group.

    87.
    发明专利
    未知

    公开(公告)号：DE19643648A1

    公开(公告)日：1998-04-23

    申请号：DE19643648

    申请日：1996-10-22

    Applicant: BASF AG

    Inventor： STROEZEL MANFRED ,  RHEUDE UDO DR ,  RAHN RALF-THOMAS DR ,  KAIBEL GERD DR

    IPC: C07B49/00 ,  C07C29/124 ,  C07C29/40 ,  C07C31/00 ,  C07C33/02

    Abstract: A process for carrying out exothermic reactions comprises (a) addition reaction of an organomagnesium halide of formula RMgX with a carbonyl compound; and (b) hydrolysis of the addition product in a solvent or solvent mixture, in which much of the heat liberated in the reaction is removed by evaporation of the solvent. R = 1-6C alkyl, alkenyl or alkynyl, or aryl; X = Cl, Br or I.

    88.
    发明专利
    未知

    公开(公告)号：DE19617210A1

    公开(公告)日：1997-11-06

    申请号：DE19617210

    申请日：1996-04-30

    Applicant: BASF AG

    Inventor： KAIBEL GERD DR ,  STROEZEL MANFRED ,  RHEUDE UDO DR

    IPC: B01D3/14 ,  B01D3/16 ,  B01D3/32 ,  B01J19/32

    Abstract: A partitioned column for separating a multi-component mixture into three or more fractions comprises at least one removable partition wall. Also claimed is a process for separating a multi-component mixture into three or more fractions using the above column.

Patent Agency Ranking