PROCESS FOR THE FINE PURIFICATION OF AN AQUEOUS ALKALI CHLORIDE SOLUTION FOR USE IN MEMBRANE ELECTROLYSIS

The aqueous alkali chloride solution is coarse- ly purified first. In the succeeding fine purification means the solution, which contains calcium ions, magnesium ions and undissolved magnesium compounds, is passed through a plu- rality of purification stages (ion exchange stages), which contain cati...

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Bibliographische Detailangaben
Hauptverfasser:	DWORAK, RAINER, LOHRBERG, KARL
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	APPARATUS THEREFOR CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM,RUBIDIUM, CAESIUM, OR FRANCIUM ELECTROLYTIC OR ELECTROPHORETIC PROCESSES ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTIONOF COMPOUNDS OR NON-METALS INORGANIC CHEMISTRY METALLURGY PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SEPARATION THEIR RELEVANT APPARATUS TRANSPORTING TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Beschreibung
Zusammenfassung:	The aqueous alkali chloride solution is coarse- ly purified first. In the succeeding fine purification means the solution, which contains calcium ions, magnesium ions and undissolved magnesium compounds, is passed through a plu- rality of purification stages (ion exchange stages), which contain cation exchange granulate. In the fine purification means the solution having a pH value of about 10 to 11 is passed through a first ion exchange stage and the solution coming from the first ion exchange stage is acidified to de- crease its pH value by at least 0.5. The solution is subse- quently passed through at least one second ion exchange stage and a solution which is virtually free of undissolved mag- nesium compounds is withdrawn from the fine purification means. The acidified solution fed to the second ion exchange stage has preferably a pH value of 5 to 10.