中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

27 records (took 0.02 seconds)

    2.
    发明专利
    未知

    公开(公告)号：DE3620013A1

    公开(公告)日：1987-12-17

    申请号：DE3620013

    申请日：1986-06-13

    Applicant: BASF AG

    Inventor： STEINIGER MICHAEL DR ,  VOSS HARTWIG DR

    IPC: C25B3/23 ,  C25B3/02 ,  C07C59/125

    Abstract: Manufacture of alkoxyacetic acids of the formula ROCH2COOH (I) in which R denotes an alkyl radical, by electrolytic oxidation of alkoxy ethanols of the formula ROCH2CH2OH (II) in the presence of an electrochemically regeneratable redox catalyst.

    5.
    发明专利
    未知

    公开(公告)号：DE3900379A1

    公开(公告)日：1990-07-12

    申请号：DE3900379

    申请日：1989-01-09

    Applicant: BASF AG

    Inventor： STEINIGER MICHAEL DR ,  VOSS HARTWIG DR ,  HUPFER LEOPOLD DR

    IPC: B01D61/24 ,  B01D61/44 ,  C07C45/00 ,  C07C45/28 ,  C07C45/78 ,  C07C45/80 ,  C07C47/127

    Abstract: Method of purification of aqueous glyoxal solutions which contain organic acids by means of a membrane cell consisting of at least two chambers, in which the glyoxal solution is passed through at least one of the chambers of the cells, which is separated from the adjacent chamber(s) by an anion exchanger cell and where the aqueous solution of a base is passed through at least one of the adjacent chambers.

    6.
    发明专利
    未知

    公开(公告)号：DE3642164A1

    公开(公告)日：1988-06-23

    申请号：DE3642164

    申请日：1986-12-10

    Applicant: BASF AG

    Inventor： VOSS HARTWIG DR ,  BRUECKEN THOMAS DR

    IPC: B01D61/44 ,  C25D13/24 ,  B01D13/02 ,  B05C11/10

    Abstract: Acid is removed from cathodic electrocoating baths by a process in which electroconductive substrates are coated with cationic resins present in the form of aqueous dispersions, at least a portion of the coating bath being subjected to an ultrafiltration where the ultrafiltration membrane retains the cationic resin to form an ultrafiltrate which contains water, solvent, low molecular weight substances and ions and at least a portion of the ultrafiltrate is recycled into the coating bath, and at least a portion of the ultrafiltrate is subjected to a special electrodialysis treatment before being returned into the electrocoating bath.

    7.
    发明专利
    未知

    公开(公告)号：DE59400935D1

    公开(公告)日：1996-12-05

    申请号：DE59400935

    申请日：1994-08-08

    Applicant: BASF AG

    Inventor： HERMELING DIETER DR ,  HANNEBAUM HEINZ ,  VOSS HARTWIG DR ,  WEIPER-IDELMANN ANDREAS DR

    IPC: C07C41/50 ,  C07C43/307 ,  C25B3/23 ,  C25B3/02

    Abstract: This invention is for the preparation of benzaldehyde dialkyl acetals of the general formula I in which R is C1-C6-alkyl and R is C1-C6-alkyl, C1-C6 -alkoxy, halogen, cyano or carboxyalkyl having from 1 to 6 carbon atoms in the alkyl group, and n is an integer from 1 to 3 and the radicals R , in the case of n > 1, can be identical or different, by electrochemical oxidation of substituted toluene compounds of the general formula II by oxidizing a substituted toluene compound II in the presence of an alkanol R -OH and an auxiliary electrolyte (supporting electrolyte) in an electrolytic cell, depressurising the reaction solution thus obtained, outside the electrolytic cell, to a pressure which is lower than the pressure in the electrolytic cell by from 10 mbar to 10 bar, and A) in the case of discontinuous operation, separating the gas liberated during expansion from the reaction solution, recycling the reaction solution into the electrolytic cell at least once, electrolysing, depressurising and separating from the liberated gas, and finally working up to give the product, or B) in the case of continuous operation, working up part of the reaction solution to give the product, admixing the remaining part of the reaction solution with such an amount of the originally employed reaction solution as corresponds to the part drawn off, recycling into the electrolytic cell, electrolysing and depressurising.

Patent Agency Ranking