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    21.
    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.

    22.
    发明专利
    未知

    公开(公告)号：DE3864779D1

    公开(公告)日：1991-10-17

    申请号：DE3864779

    申请日：1988-08-06

    Applicant: BASF AG

    Inventor： HABERMANN WOLFGANG ,  HAMMES PETER DR ,  MESSLINGER REINHARD DR ,  MUNZINGER MANFRED ,  FROEHLICH HELMUT DR

    IPC: G01N27/30

    Abstract: Redox electrode for the determn. of HNO2 and nitrosyl cpds. in an aq. soln. has a metallic conductor core with an n-conducting metal oxide surface having a conductivity x=10 power -7 to 100 ohm. cm. The core consists of sub-gp. IV-VI metals. The oxide coating consists of (mixed) oxides of W, Mo, V, Ta or Ti and pref. is produced by anodic oxidn. of the core in aq. semi-conc. H2SO4 at room temp. to a thickness of over 100 Angstroms.

    23.
    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.

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