METHOD FOR PRODUCING PAPER PULP, LIGNINS, SUGARS AND ACETIC ACID BY FRACTIONATION OF LIGNOCELLULOSIC VEGETABLE MATERIAL IN FORMIC/ACETIC ACID MEDIUM

摘要

The invention concerns a method for producing paper pulp from a lignocellulosic vegetable raw material. Said method consists in contacting said raw material with a mixture of formic acid and acetic acid (in an amount more than 5 wt. % of the mixture) at a temperature and for a suitable reaction time, the whole being performed at room temperature. The paper pulp is separated from the organic phase and optionally bleached with ozone. The organic phase is treated to enable the recycling of the formic and acetic acids and the extraction of lignins, sugars and excess acetic acid.