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1.发明专利
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
Inventor： HABERMANN WOLFGANG , HAMMES PETER , FELGER JOACHIM , HOCK KARL-LUDWIG , BRUNNMUELLER FRIEDRICH , KNITTEL HELMUT , KRANZ JOACHIM , SCHNEIDER ROLF , THOMA PETER
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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公开(公告)号：CH653710A5
公开(公告)日：1986-01-15
申请号：CH97983
申请日：1983-02-22
Applicant: BASF AG
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3.发明专利
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
Inventor： HABERMANN WOLFGANG , HAMMES PETER , FELGER JOACHIM , HOCK KARL-LUDWIG , BRUNNMUELLER FRIEDRICH , KNITTEL HELMUT , KRANZ JOACHIM , SCHNEIDER ROLF , THOMA PETER
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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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
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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