PREPARATION OF COOKING LIQUOR CONTAINING SULPHITE

摘要

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.