Preparation of cooking liquor containing sulphite

Details Preparation of cooking liquor containing sulphite Preparation of cooking liquor containing sulphite

D - Textiles, Paper

21

C

D21C 11/02 (2006.01) D21C 1/04 (2006.01) D21C 11/00 (2006.01) D21C 11/08 (2006.01) D21C 11/12 (2006.01)

Patent

CA 2171748

A process for preparing cooking liquor containing sulphite by partial oxidation of a cellulose spent liquor in a reactor (2) for forming a combustible gas, which contains carbon monoxide hydrogen and hydrogen sulphide, and a smelt containing alkali carbonate; and separation of the smelt from the gas as a liquid which is used for preparing cooking liquor and/or is used without prior causticization for delignifying cellulose-containing material. According to the invention, the combustible gas is contacted by an absorption liquid which absorbs hydrogen sulphide, which liquid is then drawn off and supplied to a device (11) for driving off a gas containing hydrogen sulphide and carbon dioxide from the liquid The hydrogen sulphide-containing gas which has been driven off is used for preparing sulphite cooking liquor.

Procédé de préparation d'une liqueur de cuisson contenant du sulfite consistant à oxyder partiellement une liqueur usée de cellulose dans un réacteur (2) de façon à former un gaz combustible qui contient du monoxyde de carbone, de l'hydrogène et du sulfure d'hydrogène, et un salin contenant un carbonate alcalin pour donner un liquide qui sert à préparer une liqueur de cuisson et/ou sert sans caustification préalable à délignifier les matières à base de cellulose. Selon l'invention, le gaz combustible est mis en contact avec un liquide qui absorbe le sulfure d'hydrogène, lequel liquide est ensuite extrait et transféré dans un dispositif (11) servant à en extraire un gaz contenant du sulfure d'hydrogène et du dioxyde de carbone. Le gaz extrait contenant du sulfure d'hydrogène sert à la préparation de la liqueur de cuisson contenant du sulfite.

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