Chemical, anatomical, and technology aspects of Eucalyptus benthamii and Eucalyptus dunii for use in an integrated pulp and paper mill

Abstract

Eucalyptus dunii has been commercially used in southern Brazil because of its relatively good frost tolerance and adequate productivity in the winter months. More recently, interest has grown in cultivating Eucalyptus benthamii Maiden & Cambage, which presents even superior frost tolerance compared to E. dunii and is highly productive as well. The quality of E. benthamii for pulp production is not yet proven. Thus, the chemical, anatomical, and technological aspects of pulp made from E. benthamii were compared with those of E. dunii for unbleached paper production. Samples of E. benthamii chips were obtained and analyzed for their basic density, chemical composition, higher heating value, trace elemental analysis, and chip size distribution. The chips were kraft cooked using conditions that produced a 74 ± 6 kappa number. The pulps were characterized for kappa number, yield, viscosity, and morphologic characteristics (e.g., length, wall thickness, and coarseness). Black liquor was analyzed for total solids, organics, inorganics, sodium sulfide, sodium hydroxide, and sodium carbonate. Brownstocks were beaten at five different energy levels in a Valley beater, and the physical strength properties of 120 g/m² handsheets were measured to develop a beater curve. The results of this study showed differences in delignification between the two woods and lower pulp yield for E. benthamii , which are related to their chemical compositions and basic densities. The E. benthamii studied in this work exhibited higher amounts of lignin and extractives, lower carbohydrate content, and lower basic density. However, cooking a blend of the two woods afforded good results in pulping and in physical pulp properties.

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).…”

Rheological properties of thick kraft black liquor at high temperature with the addition of sodium aluminate

“…Black liquor, an aqueous mixture which consists mostly of lignin, polysaccharides, resinous compounds, and inorganics such as sodium salts and small amounts of calcium, potassium, magnesium, silicon, and irons salts (Liu et al 2013;Zhang et al 2013), is the by-product extracted from papermaking materials during the pulping process (Trung et al 2015). In the recovery unit of the pulp and paper industry, black liquor is used as an energy source (Samistraro et al 2015), which is burned in a furnace after being concentrated to a solids content above 60 wt.%. One of the most important development directions is the burning of black liquor at a solid content of above 80 wt.% in recovery systems, due to its higher combustion efficiency and stability.…”