Process for pulping lignocellulosic

Details Process for pulping lignocellulosic Process for pulping lignocellulosic

D - Textiles, Paper

21

C

9/16.5

D21C 3/02 (2006.01) D21C 3/22 (2006.01)

Patent

CA 1153164

- 30 - PROCESS FOR PULPING LIGNOCELLULOSIC MATERIAL ABSTRACT OF THE DISCLOSURE Lignocellulosic material is pulped by a process comprising the steps of: introducing a molecular oxygen- -containing gas, such as air, into an alkaline sulfide solution containing NaOH, Na2S and at least one cyclic organic compound selected from quinone, hydroquinone, 9,10-diketohydroanthracene and 9,10-dihydroxyhydroanthracene compounds, to oxidize at least a portion of Na2S; delignify- ing the lignocellulosic material with an alkaline sulfide cooking liquor containing the oxidized alkaline sulfide solution at an elevated temperature and; then, recovering the resultant pulp from the delignification mixture.

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