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Roger Gaudreault

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The Resilience of Kraft Process and its future

The Resilience of Kraft Process and its future

Some background context

The Kraft pulping process, patented in 1879 and implemented in 1890, has shown resilience for more than 100 years, as it provides higher pulp strength and allows for about 98% of chemicals recovery cycle and energy efficiency. The 20th century was rich in innovation to the Kraft pro-cess, driven by the need to provide global resource efficiency and lower environmental footprint. These include batch/super-batch and continuous digesters, cold blow, impregnation vessel, ex-tended and modified cooking zone, and bleaching strategies such as oxygen delignification, mul-tistage bleaching tower, the replacement of D/CEDED bleaching sequence by higher level of chlorine dioxide substitution (e.g. D0EopD1), oxygen/ozone/totally chlorine free (TCF) and neu-tral bleaching.

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