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18 records (took 0.02 seconds)

    1.
    发明专利
    未知

    公开(公告)号：DE3347259A1

    公开(公告)日：1985-07-11

    申请号：DE3347259

    申请日：1983-12-28

    Applicant: BASF AG

    Inventor： WEISS FRANZ-JOSEF DR ,  HABERMANN WOLFGANG ,  HAMMES PETER DR ,  FROMMER ELMAR DR ,  THOMAS ERWIN ,  THOMA PETER DR

    IPC: C25B3/00 ,  C01B21/14 ,  C25B1/00

    Abstract: Aqueous solutions of hydroxylamine are prepared from aqueous hydroxylammonium salt solutions by electrodialysis by a method in which the aqueous hydroxylammonium salt solution is fed into the middle zone of an electrolysis cell, which is divided into a cathode zone, an anode zone and a middle zone by means of semipermeable membranes, and is electrolyzed, and the catholyte used is an alkali metal hydroxide solution containing ammonia and/or amines.

    2.
    发明专利
    未知

    公开(公告)号：DE3206663A1

    公开(公告)日：1983-09-01

    申请号：DE3206663

    申请日：1982-02-25

    Applicant: BASF AG

    Inventor： HABERMANN WOLFGANG ,  HAMMES PETER DR ,  FELGER JOACHIM ,  HOCK KARL-LUDWIG DR ,  BRUNNMUELLER FRITZ DR ,  KNITTEL HELMUT DR ,  KRANZ JOACHIM DR ,  SCHNEIDER ROLF DR ,  THOMA PETER DR

    IPC: C09C1/26 ,  C25B1/00

    Abstract: Blue iron hexacyanoferrate-III pigments are produced by a process wherein complex iron-II hexacyanoferrate-II (Berlin white) is prepared by electrolysis of an aqueous catholyte solution containing (a) an iron-II salt, (b) an alkali metal salt, an ammonium salt or a mixture of these, and (c) hydrogen cyanide, in an electrolysis cell in which the anode chamber and cathode chamber are separated by an ion exchange membrane, using an electrically conductive aqueous liquid in the anode chamber, and the iron-II hexacyanoferrate-II obtained is then converted to the blue pigment. The process gives Berlin white, which is substantially free from salt, in high yield and high purity. Pollution caused by the process is very low, since only a small amount of salt is produced. Compared with the corresponding blue pigments produced by prior art processes, the pigments obtained give purer colorations with better gloss, and are of higher color strength.

    8.
    发明专利
    未知

    公开(公告)号：DE3538104C2

    公开(公告)日：1993-11-25

    申请号：DE3538104

    申请日：1985-10-26

    Applicant: BASF AG

    Inventor： HABERMANN WOLFGANG ,  KRANZ JOACHIM DR ,  THOMA PETER DR

    IPC: C09B47/067 ,  C25B3/13 ,  C25B3/12 ,  C07D487/22

    Abstract: Metal phthalocyanines are prepared by electrochemical reaction of aromatic o-dinitriles with metal salts in virtually anhydrous solvents in the presence of alkali metal alkoxides or alkali metal amides with the introduction of hydrogen. Metal phthalocyanines are obtained in yields of > 90% with purities > 95%. The process products are soft granular pigments which yield brilliant and intense dyeings.

    9.
    发明专利
    未知

    公开(公告)号：DE3577784D1

    公开(公告)日：1990-06-21

    申请号：DE3577784

    申请日：1985-08-08

    Applicant: BASF AG

    Inventor： HABERMANN WOLFGANG ,  HAMMES PETER DR ,  THOMA PETER DR

    IPC: C25B11/14 ,  G01N27/30 ,  H01M4/90 ,  H01M4/96

    Abstract: 1. A process for the production of an electrode suitable for the reduction of oxygen and oxygen-containing compounds, in which (a) a carbon carrier is subjected to partial anodic oxidation in an aqueous mineral acid at a potential epsilon h of from 1.3 to + 10V, (b) the carbon carrier subjected to partial oxidation is subsequently impregnated and doped with molybdenum (VI) and/or tungsten (VI) and/or vanadium (V) compounds and (c) the doped carbon carrier is fixed with an iron, titanium and/or zirconium compound or with a dilute aqueous mineral acid, preferably from 0.1 to 3% strength by weight aqueous nitric acid or sulfuric acid or an alkali metal sulfate solution.

    Process for the purification of frozen-out crystal layers
    10.
    发明专利
    Process for the purification of frozen-out crystal layers 未知

    公开(公告)号：DE3708709A1

    公开(公告)日：1988-10-06

    申请号：DE3708709

    申请日：1987-03-18

    Applicant: BASF AG

    Inventor： HOLZKNECHT BERNHARD DR ,  FUCHS HUGO DR ,  HETZEL ECKHARD ,  WINTERMANTEL KLAUS DR ,  THOMA PETER DR

    IPC: B01D9/00

    Abstract: A process for the purification of frozen-out crystal layers in which these crystal layers, after they have been frozen out of a melt or solution on a cooling surface, are brought into contact with a purification liquid and are thus purified over their entire thickness, are then separated from the purification liquid and are subsequently melted, characterised in that the temperature of the crystal layers and of the purification liquid is in the region of the melting point or solubility point, in that the material transfer at the phase interface is intensified by forced convection, and in that this purification is carried out in a time of from 1 minute to 60 minutes on layers having a thickness from 0.2 mm to 10 mm.

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