A process is provided for reducing the emission of volatile alcohols and sulphur compounds during the evaporation of black liquor in several effects in the sulphate cellulose process. The liquor in those effects which are working with the most diluted liquor is evaporated in two or more steps on the same pressure level. The liquor is carried through the steps in series, the vapours obtained from these steps are condensed and at least a part of the condensates obtained are reintroduced into the process or purified by means of distillation.
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