| 摘要 |
<p>The process consists in : a) causing the black liquor resulting form a delignification process to undergo one or more anaerobic treatments in order to produce biogas form the organic substance to be used as an energy source and to convert, by such methanation, the sodium salts of the organic acids into Na2CO3, b) evaporating the liquor resulting from the anaerobic treatment in order to recover water condensate and concentrate the liquor, c) causing the concentrated black liquor to undergo an oxidation treatment in order to destroy the organic compounds with CO2 production and recover chemicals, heat and water, d) recovering the alkaline sodium salts by means of different solubility, e) causing the separated alkalis to undergo a decarbonation in order to transform them in carbonates ; and f) recausticing part of carbonates in sodium hydroxide, a reactant contained in the liquor of the delignification.</p> |
