EP 0820536 A1 19980128 - METHOD OF PREPARING ALKALI-METAL PEROXIDE/PERCARBONATE SOLUTIONS
Title (en)
METHOD OF PREPARING ALKALI-METAL PEROXIDE/PERCARBONATE SOLUTIONS
Title (de)
VERFAHREN ZUR HERSTELLUNG VON ALKALIPEROXID/PERCARBONAT-LÖSUNGEN
Title (fr)
PROCEDE DE PRODUCTION DE SOLUTIONS DE PEROXYDE/PERCARBONATE ALCALIN
Publication
Application
Priority
- DE 4317349 A 19930525
- EP 9401506 W 19940510
Abstract (en)
[origin: US5766443A] PCT No. PCT/EP94/01506 Sec. 371 Date Jan. 2, 1996 Sec. 102(e) Date Jan. 2, 1996 PCT Filed May 10, 1994 PCT Pub. No. WO94/28198 PCT Pub. Date Dec. 8, 1994The process for preparing an aqueous alkaline solution containing a peroxide and/or percarbonate includes providing an electrochemical cell comprising a porous oxygen diffusion cathode including a carbon woven or nonwoven fabric, a gas diffusion anode containing a carbon woven or nonwoven fabric and fed gaseous hydrogen or an anode including a metal grid coated with a noble metal catalyst and coated on a side facing the cathode with a proton-permeable membrane acting as a solid polymer electrolyte, an electrolyte-containing chamber between the cathode and the anode containing an electrolyte and a direct current source connected across the anode and cathode; feeding an aqueous feed solution containing at least one alkali hydroxide and/or alkali carbonate in a concentration of from 30 to 180 g/l into the electrolyte-containing chamber to provide the electrolyte; supplying an oxygen-containing gas containing molecular oxygen to the carbon woven or nonwoven fabric of the cathode; operating the direct current source to provide an external cell voltage of from 0.5 to 2.0 volts across the anode and the cathode; and withdrawing, from the electrolyte in the chamber, the aqueous alkaline solution containing the peroxide and/or percarbonate as a product characterized by an H2O2/alkali molar ratio of less than 4.
IPC 1-7
IPC 8 full level
CPC (source: EP US)
Citation (search report)
See references of WO 9428198A1
Designated contracting state (EPC)
AT BE DE FR GB IT NL SE
DOCDB simple family (publication)
US 5766443 A 19980616; BR 9406634 A 19960206; CA 2163896 A1 19941208; CN 1060228 C 20010103; CN 1127535 A 19960724; DE 4317349 C1 19941013; EP 0820536 A1 19980128; JP H09504827 A 19970513; WO 9428198 A1 19941208
DOCDB simple family (application)
US 56918396 A 19960102; BR 9406634 A 19940510; CA 2163896 A 19940510; CN 94192874 A 19940510; DE 4317349 A 19930525; EP 9401506 W 19940510; EP 94917610 A 19940510; JP 50015494 A 19940510