EP 0391192 B1 19950621 - Electrolytic process for manufacturing alkali dichromates and chromic acid.
Title (en)
Electrolytic process for manufacturing alkali dichromates and chromic acid.
Title (de)
Verfahren zur Herstellung von Alkalidichromaten und Chromsäuren durch Elektrolyse.
Title (fr)
Procédé de préparation de dichromates alcalins et d'acide chromique par électrolyse.
Publication
Application
Priority
DE 3911065 A 19890406
Abstract (en)
[origin: EP0391192A2] The present invention relates to an electrolytic process for manufacturing alkali dichromates and/or chromic acid from alkali metal monochromates and/or alkali metal dichromate solutions in electrolysis cells whose anode and cathode spaces are separated by cation exchanger membranes. These membranes are single-layer membranes based on perfluorinated polymers having sulphonic acid groups as cation exchanger groups. An aqueous solution having a pH of 4 to 14 is produced in the cathode space of the cells.
IPC 1-7
IPC 8 full level
C25B 1/14 (2006.01); C01G 37/14 (2006.01); C25B 1/22 (2006.01); C25B 1/28 (2006.01)
CPC (source: EP KR US)
C25B 1/22 (2013.01 - EP US); C25B 1/28 (2013.01 - EP US); C25B 1/34 (2013.01 - KR)
Designated contracting state (EPC)
DE ES FR GB IT
DOCDB simple family (publication)
EP 0391192 A2 19901010; EP 0391192 A3 19911211; EP 0391192 B1 19950621; AR 246559 A1 19940831; BR 9001593 A 19910507; CA 2013782 A1 19901006; DD 298004 A5 19920130; DE 3911065 A1 19901011; DE 59009265 D1 19950727; ES 2075083 T3 19951001; JP 2904860 B2 19990614; JP H02285084 A 19901122; KR 900016501 A 19901113; KR 960016417 B1 19961211; PL 163448 B1 19940331; RO 108989 B1 19941031; RU 1806221 C 19930330; TR 26262 A 19950215; US 5127999 A 19920707; ZA 902626 B 19910130
DOCDB simple family (application)
EP 90105661 A 19900324; AR 31658190 A 19900406; BR 9001593 A 19900405; CA 2013782 A 19900404; DD 33943090 A 19900404; DE 3911065 A 19890406; DE 59009265 T 19900324; ES 90105661 T 19900324; JP 8508690 A 19900402; KR 900004549 A 19900403; PL 28464290 A 19900405; RO 14446590 A 19900315; SU 4743501 A 19900404; TR 28190 A 19900316; US 71362591 A 19910610; ZA 902626 A 19900405