Process for the pulping of lignocellulosic material with...

Details Process for the pulping of lignocellulosic material with... Process for the pulping of lignocellulosic material with...

D - Textiles, Paper

21

C

9/21

D21C 3/02 (2006.01) D21C 3/22 (2006.01) D21C 3/26 (2006.01)

Patent

CA 1096560

G16-214 PROCESS FOR THE PULPING OF LIGNOCELLULOSIC MATERIAL WITH ALKALI AND QUINONES OR HYDROQUINONES ABSTRACT OF THE DISCLOSURE A process is provided for the alkaline pulping of lignocellulosic material with sodium hydroxide as the active alkali, which is capable of producing pulp in a yield and quality quite comparable with sulfate pulp. The process is a two stage process, without defibration between the two stages, and comprises subjecting lignocellulosic material such as wood to a first pulping stage at a temperature within the range from about 145° to about 200°C in a pulping liquor comprising sodium carbonate and/or sodium bicarbonate while removing carbon dioxide generated in the pulping stage, and then continuing the pulping without an intervening defibration at a temperature within the range from about 145° to about 200°C in a pulping liquor comprising sodium hydroxide and a quinone or hydroquinone compound.

289976

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