scholarly journals STUDIES ON PITCH TROUBLE CONTROL OF SULFITE PULP WITH SURFACTANTS

1962 ◽  
Vol 18 (5) ◽  
pp. 421-426 ◽  
Author(s):  
Hiroshi Yamada ◽  
Takehiko Tange ◽  
Wasaburo Kimura
Keyword(s):  
Sulfite Pulp

scholarly journals Influence of Input Variables over the Wood Digestion in a Sulfite Pulp Mill for Biorefinery Purposes

2015 ◽  
Vol 6 (2) ◽  
pp. 160
Author(s):  
Cristina Rueda ◽  
Carlos Tejedor ◽  
Natalia Quijorna ◽  
Ana Andrés ◽  
Alberto Coz
Keyword(s):  
Pulp Mill ◽  
Raw Material ◽  
Pulp Yield ◽  
Cellulose Content ◽  
Digestion Process ◽  
Sulfite Pulp ◽  
Input Variables ◽  
Major Attention ◽  
Wood Digestion ◽  
Better Than

Eucalyptus globulus is the most profitable specie in Europe for pulping. However, in recent years some diseases and pests have caused its defoliation, affecting the available quantity of wood. In this sense, the mills are studying how to avoid the loss of pulp yield as well as the optimization of byproducts in order to take advantage of every component present in the wood using biorefinery processes. One of the possible options is to complete the consumption of E. globulus with other species such as Eucalyptus nitens.The objective of this paper is to study the behavior of both species related to the dissolving pulp manufacturing process as well as the characteristics of the resulting products. Parameters that can be very useful for the evaluation of the raw material, such as the growing data or density of both species, have been compared. Major attention has been focused on the composition of both species and how it affects the characteristics of the possible final products.E. nitens presents good results of forestry characteristics, being better than E. globulus in terms of growing and resistance to frosts. The cellulose content of both species is similar, however the digestion process in the case of E. nitens needs to be improved in order to optimize the involved energy and the obtained products.

scholarly journals Effect of Unbleached Rice Straw Cellulose Nanofibers on the Properties of Polysulfone Membranes

Polymers ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 938 ◽  
Author(s):  
Mohammad Hassan ◽  
Ragab E. Abou Zeid ◽  
Wafaa S. Abou-Elseoud ◽  
Enas Hassan ◽  
Linn Berglund ◽  
...  
Keyword(s):  
Rice Straw ◽  
Lower Cost ◽  
Lignin Content ◽  
Aqueous Suspension ◽  
Cellulose Nanofibers ◽  
Water Flux ◽  
Current Work ◽  
Medium Size ◽  
Maximum Improvement ◽  
Sulfite Pulp

In addition to their lower cost and more environmentally friendly nature, cellulose nanofibers isolated from unbleached pulps offer different surface properties and functionality than those isolated from bleached pulps. At the same time, nanofibers isolated from unbleached pulps keep interesting properties such as hydrophilicity and mechanical strength, close to those isolated from bleached pulps. In the current work, rice straw nanofibers (RSNF) isolated from unbleached neutral sulfite pulp (lignin content 14%) were used with polysulfone (PSF) polymer to make membrane via phase inversion. The effect of RSNF on microstructure, porosity, hydrophilicity, mechanical properties, water flux, and fouling of PSF membranes was studied. In addition, the prepared membranes were tested to remove lime nanoparticles, an example of medium-size nanoparticles. The results showed that using RSNF at loadings from 0.5 to 2 wt.% can significantly increase hydrophilicity, porosity, water flux, and antifouling properties of PSF. RSNF also brought about an increase in rejection of lime nanoparticles (up to 98% rejection) from their aqueous suspension, and at the same time, with increasing flux across the membranes. Tensile strength of the membranes improved by ~29% with addition of RSNF and the maximum improvement was obtained on using 0.5% of RSNF, while Young’s modulus improved by ~40% at the same RSNF loading. As compared to previous published results on using cellulose nanofibers isolated from bleached pulps, the obtained results in the current work showed potential application of nanofibers isolated from unbleached pulps for improving important properties of PSF membranes, such as hydrophilicity, water flux, rejection, and antifouling properties.

Properties of spruce sulfite pulp and birch kraft pulp after sorption of cationic birch xylan

Cellulose ◽  
2011 ◽  
Vol 18 (3) ◽  
pp. 727-737 ◽  
Author(s):  
Katrin Schwikal ◽  
Thomas Heinze ◽  
Bodo Saake ◽  
Jürgen Puls ◽  
Abdulaziz Kaya ◽  
...  
Keyword(s):  
Kraft Pulp ◽  
Sulfite Pulp ◽  
Birch Kraft Pulp
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