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Licensed Unlicensed Requires Authentication Published by De Gruyter July 17, 2018

NSSC pulping of fast growing trees

Graziela Baptista Vidaurre EMAIL logo , Miguel Pereira , Walter Torezani Neto Boschetti , Rudolf Patt , Jorge Luiz Colodette , Benedito Rocha Vital and Maria Naruna Felix de Almeida

Abstract

Neutral sulphite semichemical pulping (NSSC) of Schizolobium amazonicum (Paricá), a fast-growing Amazonian tree, was compared with that of Eucalyptus grandis (eucalypt), one of the most important wood sources for the Brazilian pulp industry, and with mixtures of both woods in different proportions (mix). Wood chips prepared from 7-year old trees were steamed, cooked using the NSSC process and defibered in a 12” disc refiner in three stages. The paricá wood produced pulp of lower yield (75 %) than eucalypt (77 %) at 16 % sulfite/150 min/170 °C. The paricá and eucalypt pulps were bleached to about 68 and 74 % ISO brightness, respectively, by the QPFAS sequence. Paricá consumed more energy for refining in comparison with the eucalypt wood. The wood mix produced lower yield and brightness than the single species processed separately.

Funding statement: We would like to thank CNPq and DAAD, Brazilian and Germany funding agencies.

Acknowledgments

We would like to thank those who were involved in these projects: M. Sc. Pedro Gustavo Ulisses Frederico (Brazil); Wood Chemistry Laboratory, Hamburg University, Germany and Cellulose and Paper Laboratory.

  1. Conflict of interest: The authors declare no conflict of interest.

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Received: 2018-02-07
Accepted: 2018-05-11
Published Online: 2018-07-17
Published in Print: 2018-09-25

© 2018 Walter de Gruyter GmbH, Berlin/Boston

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