EP 2546389 A1 20130116 - Method for producing an ammonium or alkali metal peroxodisulfate in a non-separated electrolysis area
Title (en)
Method for producing an ammonium or alkali metal peroxodisulfate in a non-separated electrolysis area
Title (de)
Verfahren zur Herstellung eines Ammonium- oder Akalimetallperosodisulfats im ungeteilten Elektrolyseraum
Title (fr)
Procédé de fabrication de peroxodisulfate alcalin ou d'ammonium dans une pièce d'électrolyse non divisée
Publication
Application
Priority
EP 11173916 A 20110714
Abstract (en)
The method comprises performing anodic oxidation of a salt of ammonium sulfate, alkali metal sulfate and/or hydrogen sulfate containing aqueous electrolyte in electrolytic cells that comprise anodes and cathodes to obtain peroxodisulfate, where a diamond layer disposed on a conductive support and doped with a tri- or pentavalent element is used as the anode, discharging electrolyte solution from a electrolyte circuit, recovering the produced peroxodisulfate by crystallization, and separating crystals from the electrolyte solution to form an electrolytic mother liquor. The method comprises performing anodic oxidation of a salt of ammonium sulfate, alkali metal sulfate and/or hydrogen sulfate containing aqueous electrolyte in electrolytic cells that comprise anodes and cathodes to obtain peroxodisulfate, where a diamond layer disposed on a conductive support and doped with a tri- or pentavalent element is used as the anode, discharging electrolyte solution from a electrolyte circuit, recovering the produced peroxodisulfate by crystallization, separating crystals from the electrolyte solution to form an electrolytic mother liquor, and recirculating the electrolyte mother liquor while increasing the content of acid sulfate and/or hydrogen sulfate in the electrolytic cell. The electrolytic cell further comprises an undivided electrolyte space between the anode and the cathode, and is a two-dimensional or three-dimensional cell such as a flat- or a tube cell. The diamond layer has a film thickness of 1 mu m. A boron-doped diamond layer is used on a niobium or a titanium carrier as the anode. The electrolytic cells are arranged in the form of a double tube parcel. The electrolyte: comprises acidic or neutral pH value; is moved, during the method, in the circuit through the electrolytic cell; includes 100-500 g/l of persulfate; and comprises 0.1-3.5 moles of sulfuric acid per liter of the electrolyte solution. The anodic oxidation is performed with an anodic current density of 400-1200 mA/cm 2>. A total solid content of the electrolyte is 0.5-650 g/l.
Abstract (de)
Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung eines Ammonium- oder Alkalimetallperoxodisulfats.
IPC 8 full level
CPC (source: EP US)
Citation (applicant)
- US 3915816 A 19751028 - ROSSBERGER ERWIN
- DE 2757861 A1 19780629 - FMC CORP
- EP 0428171 B1 19930929
- DE 19913820 A1 19991007 - MITSUBISHI GAS CHEMICAL CO [JP]
- EP 1148155 B1 20050608 - DEGUSSA [DE]
- P.A. MICHAUD ET AL., LEHREN IN ELECTRO CHEMICAL AND SOLID-STATE LETTERS, vol. 3, no. 2, 2000, pages 77 - 79
Citation (search report)
- [XI] WO 2005121408 A2 20051222 - DEGUSSA INITIATORS GMBH & CO K [DE], et al
- [AD] EP 1148155 A2 20011024 - DEGUSSA [DE]
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
EP 2546389 A1 20130116; CA 2841843 A1 20130117; CN 103827354 A 20140528; CN 103827354 B 20170524; DK 2732073 T3 20170828; EP 2732073 A2 20140521; EP 2732073 B1 20170426; ES 2626642 T3 20170725; JP 2014523490 A 20140911; JP 6151249 B2 20170621; KR 20140054051 A 20140508; PL 2732073 T3 20170929; RU 2014105424 A 20150820; TR 201707950 T4 20181121; US 2014131218 A1 20140515; US 9556527 B2 20170131; WO 2013007816 A2 20130117; WO 2013007816 A3 20130620
DOCDB simple family (application)
EP 11173916 A 20110714; CA 2841843 A 20120713; CN 201280041289 A 20120713; DK 12737524 T 20120713; EP 12737524 A 20120713; EP 2012063783 W 20120713; ES 12737524 T 20120713; JP 2014519570 A 20120713; KR 20147003710 A 20120713; PL 12737524 T 20120713; RU 2014105424 A 20120713; TR 201707950 T 20120713; US 201214232322 A 20120713