Fractionation of black liquor – aliphatic carboxylic acids

Fractionation of black liquor – aliphatic carboxylic acids General approach Roughly one half of the wood dry matter degrades and dissolves in kraft pulping.1,2 Therefore, under alkaline conditions, a substantial amount of hemicelluloses is converted into aliphatic carboxylic acids, which, together with lignin degradation fragments and extractives, are removed from the initial chips and dissolved