Features Environment & Sustainability
BLACK LIQUOR COMPOSITION

ESPOO, Finland — The October 2000 issue of Paperi ja Puu has an article by Esa Vakkilainen, Andritz-Ahlstrom Corporation, titled Estimation of elemental composition from proximate analysis of black l…
ESPOO, Finland — The October 2000 issue of Paperi ja Puu has an article by Esa Vakkilainen, Andritz-Ahlstrom Corporation, titled Estimation of elemental composition from proximate analysis of black liquor. Black liquor properties will vary depending upon the raw materials used for pulping, the pulping conditions, the equipment used and the treatment of the liquor after pulping. Accurate analysis of black liquor is needed to determine energy efficiency of a pulp mill, to calculate gas flows for environmental compliance reports and for production statistics. Black liquor composition and combustion properties can be estimated from the known spread of data. The main source has been the company’s internal black liquor databank, which contains more than 900 black liquor analyses. Regression equations for black liquor carbon, hydrogen and inorganic element contents were derived.