Patent ID: 8157964
Filing Date: 2012-04-17
Classification: D21C

Abstract:
1. An installation for implementing a method for producing paper pulp, lignins and sugars in which: annual or perennial plants, used in their entirety or partially, which constitute an original lignocellulosic raw material are combined with a mixture of organic acids during an impregnation step; during a fractionation step, a solid fraction constituting the paper pulp is then separated from an organic phase containing, the original organic acids in solution, solubilized sugar monomers and polymers, and lignins derived from the original lignocellulosic raw material; the impregnation and fractionation are conducted at atmospheric pressure; the installation comprising: means for transferring the raw material comprising a conveyor, from upstream to downstream, successively to a first treatment station and at least one second treatment station for the raw material and which are arranged consecutively from upstream to downstream and constituting a first pair of consecutive treatment stations, each treatment station comprising: means for temporarily combining, at the first station, the raw material with a quantity of a first mixture of organic acids, known as the impregnation mixture, and, at the second station, for temporarily combining the raw material with a quantity of a second impregnation mixture of organic acids; means, after impregnation, for at least partially recovering said 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, comprising a pump, a piping and a control valve downstream of said pump; and means, after impregnation, for removing a portion of said quantity of second mixture to extract therefrom solubilized sugar monomers, polymers and lignins derived from the original raw plant material, comprising the pump, a second piping and a second control valve downstream of said pump.