Production of blue iron hexacyanoferrate-III pigments

Details Production of blue iron hexacyanoferrate-III pigments Production of blue iron hexacyanoferrate-III pigments

1983-02-18

1984-08-21

Tung, T.

Chemistry: electrical and wave energy

Processes and products

204 59R, 204180P, C25B 100

Patent

active

044668678

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.

REFERENCES:
patent: 2273798 (1942-02-01), Heise et al.
patent: 2353782 (1944-07-01), Neumark
patent: 4032415 (1977-06-01), Sanders
patent: 4178218 (1979-12-01), Seko

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