Preparation of ethers, esters or acid anhydrides

    公开(公告)号:NZ535772A

    公开(公告)日:2005-11-25

    申请号:NZ53577203

    申请日:2003-04-14

    Applicant: BASF AG

    Abstract: A process for preparing ethers, esters or acid anhydrides is disclosed, wherein a cake of a first reactant selected from salts of organic or oxygen-containing inorganic acids or alkoxides disposed on a filtering element is allowed to flow though by a solution consisting of a second reactant selected from inorganic or organic acid halides and alkyl halides, whereby the formed insoluble halide salt remains on the filtering element, which enables the halide salt to be easily separated in an essentially quantitative manner.

    44.
    发明专利
    未知

    公开(公告)号:AT289864T

    公开(公告)日:2005-03-15

    申请号:AT02767452

    申请日:2002-08-29

    Applicant: BASF AG

    Abstract: A process for carrying out a liquid/solid reaction comprises a) preparing a reaction suspension in which a first reactant is present in suspended form and a second reactant is present in dissolved form in a suspension medium, where one of the reaction products is insoluble in the suspension medium, b) passing the reaction suspension through an elongated reaction zone so that the Reynolds number of the stream is less than 20,000 and c) separating off the insoluble reaction product formed. The process has the advantage that the insoluble reaction product is obtained in a readily filterable form.

    45.
    发明专利
    未知

    公开(公告)号:BR0309078A

    公开(公告)日:2005-02-22

    申请号:BR0309078

    申请日:2003-04-14

    Applicant: BASF AG

    Abstract: A process for the production of ethers, esters or acid anhydrides comprises flowing a solution of an inorganic or organic acid halide and alkyl halide through a filter cake containing salts of organic or oxygen containing inorganic acids or alcoholates such that the insoluble halide salt formed remains of the filter.

    46.
    发明专利
    未知

    公开(公告)号:BR0214509A

    公开(公告)日:2004-11-03

    申请号:BR0214509

    申请日:2002-12-03

    Applicant: BASF AG

    Abstract: A process is described for preparing ammonium salts of aromatic carboxylic acids by reacting an aromatic carboxylic acid with ammonia in an aprotic solvent, which comprises carrying out the reaction in a closed vessel by continuously introducing a solution of the aromatic carboxylic acid in the aprotic solvent and passing in gaseous ammonia so that an ammonia partial pressure in the range from 0.1 to 3 bar is maintained in the gas space of the vessel, and discharging a suspension of the ammonium salt in the aprotic solvent. The process allows the preparation of ammonium salts of defined crystal size having a narrow size distribution.

    PRODUCTION OF AMMONIUM SALTS OF AROMATIC CARBOXYLIC ACIDS

    公开(公告)号:AU2002356773A1

    公开(公告)日:2003-06-17

    申请号:AU2002356773

    申请日:2002-12-03

    Applicant: BASF AG

    Abstract: A process is described for preparing ammonium salts of aromatic carboxylic acids by reacting an aromatic carboxylic acid with ammonia in an aprotic solvent, which comprises carrying out the reaction in a closed vessel by continuously introducing a solution of the aromatic carboxylic acid in the aprotic solvent and passing in gaseous ammonia so that an ammonia partial pressure in the range from 0.1 to 3 bar is maintained in the gas space of the vessel, and discharging a suspension of the ammonium salt in the aprotic solvent. The process allows the preparation of ammonium salts of defined crystal size having a narrow size distribution.

Patent Agency Ranking