Compagnie Industrielle De La Matiere Vegetale

Gérard Avignon

Michel Delmas

Bouchra Benjelloun Mlayah

The invention proposes an installation () in which the impregnation and fractionation of the raw material (MP) are conducted at atmospheric pressure, characterized in that it comprises means () for transferring the raw material (MP) successively to a first treatment station (PT) and a second treatment station (PT), each comprising means (G, G) for temporarily combining, at the first station (PT), the raw material (MP) with a quantity of a first mixture of organic acids and, at the second station (PT), for temporarily combining the raw material (MP) with a quantity of a second mixture; and means, after impregnation, for at least partially recovering the quantity of second mixture after impregnation and for recycling at least a portion of the second recovered mixture to form at least partially said first impregnation mixture used at the first station (PT).

Installation for implementing a method for producing paper pulp, lignins and sugars and production method using such an installation

A method for producing paper pulp from a lignocellulosie vegetable raw material. The method includes contacting the 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.

Method for producing paper pulp, lignins, sugars and acetic acid by frantionation of lignocellulosic vegetable material in formic/acetic acid medium

The invention concerns a method for bleaching different types of paper pulp in two steps at atmospheric pressure and at a temperature not higher than 100 DEG C. The first step consists in contacting the unbleached paste with a mixture of paracetic acid and performic acid. The second step consists in treating the bleached pulp derived from the first step, with a solution of soda and hydrogen peroxide. The resulting pulps exhibit a high index of whiteness and a degree of polymerisation close to unbleached pulps. The method is environmentally safe and non-polluting.

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Estillac, France

Gérard Avignon