D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
D21C 11/04 (2006.01) D21C 11/00 (2006.01)
Patent
CA 2181584
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.
Procédé de séparation du chlorure d'une liqueur alcaline contenant du sulfure obtenue dans la production de pâte à papier chimique. Le procédé selon l'invention consiste à mettre la liqueur, dans une première zone de contact gaz/liquide, au contact d'un gaz contenant du dioxyde de carbone dont la pression partielle dépasse 0,2 atm, de manière à obtenir un liquide alcalin contenant des composés de carbonate d'hydrogène et de chlorure alcalins dissous. Ces composés sont ensuite extraits et transférés dans une seconde zone de contact gaz/liquide dans laquelle une pression inférieure à celle de la première zone de contact gaz/liquide est maintenue, de manière à obtenir un liquide alcalin contenant des composés de carbonate et de chlorure alcalins, et du sulfure d'hydrogène qui est extrait. On extrait d'abord de la seconde zone de contact gaz/liquide le liquide alcalin contenant les composés de carbonate et de chlorure alcalins, lequel est ensuite transféré dans la première zone de contact gaz/liquide, puis le liquide alcalin principalement exempt de sulfure contenant les composés de carbonate et de chlorure alcalins, lequel est ensuite transféré dans un système destiné à séparer des composés de chlorure.
Fetherstonhaugh & Co.
Kvaerner Chemrec Aktiebolag
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