Process for the delignification of cellulosic substances by pretreating with a complexing agent followed by hydrogen peroxide

摘要

Process for the delignification of cellulosic substances comprising: a first stage of treatment of cellulosic substances with an acid a second stage of treatment with hydrogen peroxide in an alkaline medium a third stage of digestion in the presence of at least one chemical reactant chosen from hydroxides of alkaline or alkaline-earth metals. The process applies to the treatment of wood fragments.