Validation of a Modified Berty Reactor for Studying Intrinsic Kinetics and Selectivity of Oxygen Delignification of Southern Pine Kraft Pulp, 2018 PEERS

Oxygen delignification is an important step for reducing pulp lignin content in order to decrease consumption of bleaching chemicals as well as effluent in the bleach plant. Unfortunately, the degree of oxygen delignification is limited to about 60% so as not to impair pulp strength. Therefore, we are studying the effect of operating conditions and additives on the intrinsic kinetics and selectivity of oxygen delignification with the objective to decrease the cellulose degradation at high degree of delignification. The intrinsic kinetics of oxygen delignification are best studied in a Berty reactor where an oxygenated caustic solution is rapidly circulated through a pad of Kraft Southern Pine pulp fibers contained in a basket inside the Berty reactor. At constant inflow of a fresh oxygenated caustic solution and the same constant outflow from the reactor, the Berty operates as a Continuous Stirred Tank Reactor (CSTR). The pulp properties are determined at different reaction times, while the delignification rate is measured continuously.   

In this work we will show that the delignification rate, kappa number and intrinsic viscosity are not affected by the amount of pulp, circulation rate in the reactor, and type and pressure of driving gas to provide the hydraulic pressure to feed the liquor to the reactor.  

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