Chemical composition and kraft pulping potential of 12 eucalypt species

Abstract

Eucalypts are among the most important short-rotation hardwoods, planted worldwide for the pulp and paper industry. Even though the genus comprises over 700 species, only about a dozen species are used for pulping purposes, therefore, showing the potential for diversification. Six-year-old eucalypt trees from 12 species (Eucalyptus botryoides, Eucalyptus camaldulensis, Eucalyptus globulus, Eucalyptus grandis, Corymbia maculata, Eucalyptus ovata, Eucalyptus propinqua, Eucalyptus resinifera, Eucalyptus rudis, Eucalyptus saligna, Eucalyptus sideroxylon, and Eucalyptus viminalis) were analyzed for chemical composition, fiber morphological, pulping and handsheet paper properties to determine their kraft pulping suitability. The 12 species showed substantial differences regarding extractives (6.1-18.9%), lignin (21.6-30.8%) and holocellulose content (55.4-70.1%). The high inter-species variation in chemical composition produced pulps with different yields (between 38.9 and 49.8%) and degree of delignification (kappa number between 11.6 and 24.2). The combination of these results with the morphological and handsheet properties suggests that E. globulus, E. ovata, E. grandis, E. saligna and E. botryoides have the best overall characteristics for kraft pulping.

Bark Characterisation of the Brazilian Hardwood Goupia glabra in Terms of Its Valorisation

“…The xylose proportion in G. glabra bark is significantly higher when compared with other types of bark. The ratio of glucose to xylose was approximately 1, while it is generally between 1.5 and 3 in most hardwoods barks, e.g., 3.0 in T. grandis (Baptista et al 2013), 2.9 in E. globulus, 1.4 in B. pendula , 2.8 in C. langsdorffii (Carmo et al 2016), 1.6 to 2.0 in Salix (Serapiglia et al 2009); in wood, this ratio varied between 2.4 and 3.1 in different Eucalyptus species (Neiva et al 2015).…”

“…This extent of lignification is significantly higher than values reported for the barks of other hardwood species, e.g., T. grandis (20%, Baptista et al 2013), B. pendula (27.9%, Miranda et al 2013), Salix spp. (20 to 26%, Serapiglia et al 2009), Fagus crenata, and Quercus mongolica (respectively, 34.6% and 24.9% (Kofujita et al 1999)), E. globulus (19.2%, Vázquez et al 2008, and18.6%, Sakai 2001), and in 12 Eucalyptus species (21.6 to 30.8%, Neiva et al 2015).…”

Pembuatan dan Karakterisasi Dissolving Pulp Serat Panjang dari Bambu Duri (Bambusa blumeana)

“…Rata-rata panjang serat bambu lebih panjang dari Eucalyptus spp. 0,568 mm -1,14 mm (Gominho et al, 2014;Carrillo et al, 2015;Neiva et al, 2015;Samistraro et al, 2015) bilangan runkel kurang dari atau sama dengan satu berarti serat tersebut memiliki dinding serat tipis sehingga pelarut dan bahan kimia bisa menembus lebih mudah ke dalam serat dan mempermudah proses pemasakan (Sugesty, Kardiansyah and Hardiani, 2015). Bilangan runkel yang rendah juga akan menghasilkan pulp dengan kekuatan mekanik yang baik (Sharma et al, 2011).…”

Juvenile Wood Characterization of Eucalyptus botryoides and E. maculata by using SilviScan

“…Intensive research has concentrated on the pulp fibre quality of different commercial eucalypt species, e.g. E. globulus and hybrids such as E. urograndis, although species diversification has also been proposed Neiva et al 2015). The use of eucalypts for their solid wood value is promising and an object of increasing interest (Nolan et al 2005).…”