EP 1322943 A1 20030702 - A PROCESS AND DEVICE FOR CONTINUOUS IONIC MONITORING OF AQUEOUS SOLUTIONS
Title (en)
A PROCESS AND DEVICE FOR CONTINUOUS IONIC MONITORING OF AQUEOUS SOLUTIONS
Title (de)
PROZESS UND EINRICHTUNG ZUR KONTINUIERLICHEN IONISCHEN ÜBERWACHUNG WÄSSRIGER LÖSUNGEN
Title (fr)
PROCEDE ET DISPOSITIF DE CONTROLE IONIQUE CONTINU DE SOLUTIONS AQUEUSES
Publication
Application
Priority
- US 0125264 W 20010810
- US 22450000 P 20000811
Abstract (en)
[origin: WO0214850A1] An electrolytic process and apparatus are disclosed for continuously producing the cation conductivity, anion conductivity, and temperature data required for continuous monitoring of the pH of high-purity aqueous solution flows. The cation exchange material and the anion exchange material used for conditioning water samples for conductivity measurements are continuously regenerated by applying a DC electric voltage between an anode and a cathode either across the cation exchange material, whereby hydrogen ions generated at the anode move through the cation exchange material displacing cations previously absorbed and these displaced cations under the influence of the electric field migrate to the cathode, or across the anion exchange material, whereby hydroxyl ions generated at the cathode regenerate the anion exchange material. The temperature-corrected cation conductivity and the temperature-corrected anion conductivity are then used together with measurement of the specific conductivity of the sample to calculate the pH of the sample.
IPC 1-7
IPC 8 full level
G01N 27/26 (2006.01); B01J 47/12 (2006.01); B01J 49/00 (2006.01); C02F 1/00 (2006.01); G01N 27/06 (2006.01); G01N 27/08 (2006.01); G01N 27/27 (2006.01); G01N 27/28 (2006.01); G01N 33/18 (2006.01)
CPC (source: EP)
G01N 27/06 (2013.01); G01N 33/18 (2013.01)
Citation (search report)
See references of WO 0214850A1
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
DOCDB simple family (publication)
WO 0214850 A1 20020221; WO 0214850 A9 20050113; AU 1295702 A 20020225; CN 1444729 A 20030924; EP 1322943 A1 20030702; JP 2004506895 A 20040304
DOCDB simple family (application)
US 0125264 W 20010810; AU 1295702 A 20010810; CN 01813324 A 20010810; EP 01981302 A 20010810; JP 2002519929 A 20010810