EP 0745155 A1 19961204 - PROCESS FOR SEPARATING OFF CHLORIDE FROM SULPHIDE-CONTAINING ALKALINE LIQUOR
Title (en)
PROCESS FOR SEPARATING OFF CHLORIDE FROM SULPHIDE-CONTAINING ALKALINE LIQUOR
Title (de)
VERFAHREN ZUR CHLORIDABTRENNUNG VON SCHWEFELWASSERSTOFFHALTIGER ALKALILAUGE
Title (fr)
PROCEDE DE SEPARATION DU CHLORURE D'UNE LIQUEUR ALCALINE CONTENANT DU SULFURE
Publication
Application
Priority
- SE 9500059 W 19950123
- SE 9400383 A 19940207
Abstract (en)
[origin: WO9521291A1] A process for separating off chloride from a sulphide-containing alkaline liquor which is obtained in association with the production of chemical pulp. According to the invention, the liquor is contacted, in a first gas/liquid contact zone, by a carbon dioxide-containing gas, the carbon dioxide partial pressure of which exceeds 0.2 atm, in order to obtain an alkaline liquid which contains dissolved alkali hydrogen carbonate and chloride compounds and which is drawn off and transferred to a second gas/liquid contact zone, in which a lower pressure is maintained than in the first gas/liquid contact zone, in order to obtain an alkaline liquid which contains alkali carbonate and chloride compounds, and hydrogen sulphide which is driven off. From the second gas/liquid contact zone are drawn off, firstly, alkaline liquid containing alkali carbonate and chloride compounds, which is transferred to the first gas/liquid contact zone, and, secondly, alkaline, and in the main sulphide-free, liquid which contains alkali carbonate and chloride compounds and which is transferred to a system for separating off chloride compounds.
IPC 1-7
IPC 8 full level
D21C 11/00 (2006.01)
CPC (source: EP)
D21C 11/0071 (2013.01)
Citation (search report)
See references of WO 9521291A1
Designated contracting state (EPC)
AT DE ES FR PT
DOCDB simple family (publication)
WO 9521291 A1 19950810; AU 1721595 A 19950821; CA 2181584 A1 19950810; EP 0745155 A1 19961204; SE 9400383 D0 19940207; SE 9400383 L 19950808
DOCDB simple family (application)
SE 9500059 W 19950123; AU 1721595 A 19950123; CA 2181584 A 19950123; EP 95909161 A 19950123; SE 9400383 A 19940207