Pulping process without a recovery furnace

Details Pulping process without a recovery furnace Pulping process without a recovery furnace

D - Textiles, Paper

21

C

D21C 11/00 (2006.01) D21C 3/02 (2006.01) D21C 11/04 (2006.01) D21C 11/12 (2006.01)

Patent

CA 2345394

A novel pulping process has been discovered whereby acid is added to the black liquor mixture. The acid renders the lignin insoluble thus enabling it to be separated from the black liquor. The invention obviates the need for a recovery boiler which burns the sugars and the lignin. Additionally, sodium salts are precipitated out of the process. Sodium carbonate from outside sources is used in the novel process.

La présente invention concerne un procédé de préparation de pâte dans lequel un acide est ajouté à la liqueur noire. L'acide provoque l'insolubilité de la lignine, ce qui permet de la séparer de la liqueur noire. L'invention permet d'éviter le besoin d'une chaudière de récupération qui brûle les sucres et la lignine. En outre, dans ce procédé des sels de sodium sont précipités. Dans ce procédé, on utilise du carbonate de sodium provenant de sources extérieures.

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