中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

156 records (took 0.039 seconds)

    21.
    发明专利
    未知

    公开(公告)号：DE19803675A1

    公开(公告)日：1999-08-05

    申请号：DE19803675

    申请日：1998-01-30

    Applicant: BASF AG

    Inventor： DOCKNER TONI DR ,  MOHR JUERGEN DR ,  FREDE MARKUS DR

    IPC: B01D61/44 ,  C07C29/10 ,  C07C31/20 ,  B01D61/42 ,  C07C29/76

    Abstract: The invention relates to a method for producing alkylene glycol, according to which a reaction mixture containing an alkylene oxide or a mixture of two or more alkylene oxides as well as water and a catalyst triggering dissociation in water is reacted. In this way a product mixture containing alkylene glycol is obtained which is then purified by means of electrodialysis.

    CONTINUOUS PREPARATION OF (METH)ACRYLIC ACID ALKYL ESTERS
    27.
    发明专利
    CONTINUOUS PREPARATION OF (METH)ACRYLIC ACID ALKYL ESTERS 未知

    公开(公告)号：CZ30997A3

    公开(公告)日：1997-10-15

    申请号：CZ30997

    申请日：1997-02-03

    Applicant: BASF AG

    Inventor： SCHMIDT WILLI ,  MATTHIAS GEISENDORFER DR ,  DOCKNER TONI DR ,  HERBST HOLGER DR ,  NESTLER GERHARD DR

    IPC: B01J31/02 ,  C07B61/00 ,  C07C67/08 ,  C07C67/54 ,  C07C69/54

    Abstract: In the continuous production of alkyl (meth)acrylates (AA) by reacting (meth)acrylic acid with 1-8 carbon (C) monohydric alkanols in homogeneous liquid phase, free from solvent, at elevated temperature and in the presence of an acid esterification catalyst; (a) (meth)acrylic acid, alkanol and catalyst are fed to a reaction zone; (b) during a residence time, the water formed is separated in a rectification unit (RU) III above the reaction zone; (c) the aqueous distillate is separated into an organic phase containing the alkanol and an aqueous phase; (d) the organic phase is recycled to RU III; and (e) the reaction mixture is discharged from the reaction zone and passed to another RU, where AA is separated by distillation. The novel features are that: (i) the molar ratio of (meth)acrylic acid and alkanol is 1:(0.75-2); (ii) the aqueous phase from RU III is partly recycled to RU III; (iii) the reaction mixture is passed to RU I, in which it is separated into a product (II) containing the catalyst and a product (I) containing AA, residual alkanol and residual (meth)acrylic acid; and (iv) (I) is passed to RU II, in which AA is separated from residual alkanol and residual (meth)acrylic acid and the alkanol and acid are recycled to the reaction zone. Preferably the alkanol is 2-ethylhexanol. The catalyst is para-toluenesulphonic acid (p-TSA) and/or other organic sulphonic acids, e.g. methane-, benzene- or dodecylbenzene-sulphonic acid, and/or sulphuric acid (H2SO4). The catalyst concentration in the reaction mixture is 0.1-10, especially 0.1-6 wt.% p-TSA in the reaction zone and 2.5-50 wt.% p-TSA in the sump or an equimolar amount of organic sulphonic acid and/or H2SO4. The reaction zone consists of a cascade of NOTLESS 2, especially 2-4 consecutive sections, especially reactors with circulating vapourisers. All rectification units are rectification columns.

    30.
    发明专利
    未知

    公开(公告)号：DE58909208D1

    公开(公告)日：1995-06-08

    申请号：DE58909208

    申请日：1989-02-03

    Applicant: BASF AG

    Inventor： KEMPE UWE DR ,  DOCKNER TONI DR ,  KOEHLER HERMANN DR

    IPC: C07D233/90 ,  C07D235/24

    Abstract: Process for the preparation of 4,5-disubstituted imidazole- 2-carboxylic acids by reacting 4,5-disubstituted imidazoles with carbon dioxide at elevated pressure and at temperatures of 150 to 300 DEG C in the presence of a base, and novel 4,5-disubstituted imidazole-2-carboxylic acids.

Patent Agency Ranking