Oxygen delignification of lignocellulosic material

Details Oxygen delignification of lignocellulosic material Oxygen delignification of lignocellulosic material

D - Textiles, Paper

21

C

D21C 3/02 (2006.01) D21C 3/26 (2006.01) D21C 9/10 (2006.01) D21C 9/147 (2006.01)

Patent

CA 2311718

The invention configures a process for delignifying pulp wherein one stage of a two stage oxygen delignification plant is obviated. In particular, a pulp soak stage enables a pulp stream to be mixed with an alkali feed and held in residence for a sufficient period of time to allow an alkali hydrolysis leaching of colored materials from the pulp and a swelling of the pulp fibers. Next, the pulp stream is combined with an oxygen feed and is processed through a mixer. The output of the mixer is fed to a pressurized reactor where oxygen reacts with lignin of the pulp fibers. The swelled pulp fibers facilitate the oxygen reaction with lignin and removal of additional colored materials.

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