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Photodelignification of Eucalyptus grandis organosolv chemical pulp

✍ Scribed by Antonio Eduardo de Hora Machado; Reinaldo Ruggiero; Manuel G.H. Terrones; Aziz Nourmamode; Stephane Grelier; Alain Castellan

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
566 KB
Volume
94
Category
Article
ISSN
1010-6030

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✦ Synopsis

Efficient delignification of Eucalyptus grandis organosolv pulp was achieved. The process, which was chlorine and sulphur free, removed 88% of the lignin (kappa number (KN) 65 to 8) with moderate viscosity loss (T/= 19 cP to 12 cP). The best sequence involved three photochemical stages in alkaline medium (NaOH) at 85 °C. The first stage involved oxygen treatment; this was followed by the action of excited singlet oxygen produced by methylene blue (4.5 × 10-5 mol 1-~ ). The last stage, using hydrogen peroxide (6% relative to the weight of oven dried pulp (odp)), was the most efficient, the structure of the lignin having been prepared by the first two stages. The mechanism of the overall process remains unknown.

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