Four stage alkaline peroxide mechanical pulpings

Details Four stage alkaline peroxide mechanical pulpings Four stage alkaline peroxide mechanical pulpings

2010-03-26

2011-11-01

Fortuna, Jose A (Department: 1741)

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Chemical treatment after start or completion of mechanical...

C162S026000, C162S056000, C162S078000

Reexamination Certificate

active

08048263

ABSTRACT:
A process for applying chemicals, such as an alkaline peroxide pretreatment (1) to lignocellulosic material before chemical refining and at the primary refiner (3). The preferred embodiment comprises (i) preconditioning at temperatures below 95° C., especially below 80° C., (ii) limiting the time and/or temperature in the refiner, (iii) reaction quench to maintain temperatures below 80° C., and (iv) subsequent high consistency bleaching (4).

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