Four stage alkaline peroxide mechanical pulpings
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United States of America Patent
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-
Nov 1, 2011
Grant Date -
Jul 29, 2010
app pub date -
Mar 26, 2010
filing date -
Jul 19, 2001
priority date (Note) -
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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.degree. C., especially below 80.degree. C., (ii) limiting the time and/or temperature in the refiner, (iii) reaction quench to maintain temperatures below 80.degree. C., and (iv) subsequent high consistency bleaching (4).
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