PRODUCTION OF BLUE IRON HEXACYANOFERRATE-III PIGMENTS FROM BERLIN WHITE PREPARED ELECTROLYTICALLY

    公开(公告)号:GB2118576B

    公开(公告)日:1985-05-15

    申请号:GB8305190

    申请日:1983-02-24

    Applicant: BASF AG

    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.

    FUEL CELL
    5.
    发明专利

    公开(公告)号:CA1257646A

    公开(公告)日:1989-07-18

    申请号:CA488914

    申请日:1985-08-16

    Applicant: BASF AG

    Abstract: In a fuel cell which has an activated carbon-containing anode and an activated carboncontaining cathode and is preferably used for the oxidative treatment of waste waters containing oxygen or oxygen-containing compounds, the cathode has been subjected to partial anodic oxidation in a mineral acid at a potential .epsilon.h of from +1.3 to +10V and then doped with molybdenum(VI) and/or tungsten(VI) and/or vanadium(V) compounds, and the anode has been subjected to partial anodic oxidation in an aqueous mineral acid, cathodically reduced in an aqueous mineral acid and then impregnated with cobalt hydroxide and/or nickel hydroxide and/or copper hydroxide and/or zinc hydroxide, the anode and the cathode being separated by a porous polyelectrolyte through which the waste water flows.

    6.
    发明专利
    未知

    公开(公告)号:FI94432B

    公开(公告)日:1995-05-31

    申请号:FI911401

    申请日:1991-03-22

    Applicant: BASF AG

    Abstract: A process is described for the electrochemical cleavage of alkali metal sulphates into relatively highly concentrated solutions of alkali metal hydroxide and sulphuric acid by means of the use of a 3-compartment electrodialysis cell at temperatures of >/= 70 to equipped with an anion exchanger membrane, the polymeric ion exchanger matrix of which is composed of a styrene/divinylbenzene copolymer, having very highly basic quaternary ammonium groups, and a hydronium ion blocker, on the side of which facing the central chamber is located an anion exchanger layer or anion exchanger membrane having tertiary or secondary amino groups.

    7.
    发明专利
    未知

    公开(公告)号:FI911401A

    公开(公告)日:1991-09-24

    申请号:FI911401

    申请日:1991-03-22

    Applicant: BASF AG

    Abstract: A process is described for the electrochemical cleavage of alkali metal sulphates into relatively highly concentrated solutions of alkali metal hydroxide and sulphuric acid by means of the use of a 3-compartment electrodialysis cell at temperatures of >/= 70 to equipped with an anion exchanger membrane, the polymeric ion exchanger matrix of which is composed of a styrene/divinylbenzene copolymer, having very highly basic quaternary ammonium groups, and a hydronium ion blocker, on the side of which facing the central chamber is located an anion exchanger layer or anion exchanger membrane having tertiary or secondary amino groups.

    8.
    发明专利
    未知

    公开(公告)号:FI911401A0

    公开(公告)日:1991-03-22

    申请号:FI911401

    申请日:1991-03-22

    Applicant: BASF AG

    Abstract: A process is described for the electrochemical cleavage of alkali metal sulphates into relatively highly concentrated solutions of alkali metal hydroxide and sulphuric acid by means of the use of a 3-compartment electrodialysis cell at temperatures of >/= 70 to equipped with an anion exchanger membrane, the polymeric ion exchanger matrix of which is composed of a styrene/divinylbenzene copolymer, having very highly basic quaternary ammonium groups, and a hydronium ion blocker, on the side of which facing the central chamber is located an anion exchanger layer or anion exchanger membrane having tertiary or secondary amino groups.

    PRODUCTION OF BLUE IRON HEXACYANOFERRATE-III PIGMENTS FROM BERLIN WHITE PREPARED ELECTROLYTICALLY

    公开(公告)号:GB2118576A

    公开(公告)日:1983-11-02

    申请号:GB8305190

    申请日:1983-02-24

    Applicant: BASF AG

    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.

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