this study was conducted to compare the yield and strength properties of soda and kraft pulp produced from populus deltoeides sapwood and heartwood. initially fiber length, lignin content in both sapwood and heartwood were measured. then from either sapwood or heartwood pulps were prepared with using soda and kraft processes, handsheets were made from this pulp and mechanical properties were me...

Soda lignin does not have thermal flowing characteristics and it is impossible for it to be further thermally molded. To achieve the fusibility of soda lignin for fiber preparation by melt-spinning, an effective method for soda lignin modification was conducted by cooking it with polyethylene glycol (PEG) 400 at various ratios. The higher the ratio of PEG that was used, the more PEG molecular c...

one of the solutions to increase the applications of lignin molecules is increasing reactive functional groups by chemical modification. adding reactive functional groups into the lignin structures is one the best proposed methods. the aim of this study was to investigate change in structure as well as glass transition temperature (tg) of soda and kraft lignins after hydroxymethylation them wit...

in this research, the characteristics of cmp dioxane lignin (hardwood origin) and soda bagasse lignin (ethanol soluble fraction) and dioxane lignin of bagasse were studied using gel permeation chromatography, gas chromatography-mass spectrometry and 13c nmr spectroscopy and dfrc degradation procedure. the results indicated that the main structural units in lignins are phenyl propane skeletons b...

In this research, the characteristics of CMP dioxane lignin (hardwood origin) and soda bagasse lignin (ethanol soluble fraction) and dioxane lignin of bagasse were studied using gel permeation chromatography, gas chromatography-mass spectrometry and 13C NMR spectroscopy and DFRC degradation procedure. The results indicated that the main structural units in lignins are phenyl propane skeletons b...

We have studied the structural modifications of lignins from sisal and flax during their soda-anthraquinone (AQ) pulping and subsequent totally chlorine-free (TCF) and elementary chlorine-free (ECF) bleaching. For this purpose, residual lignins were isolated from pulps, analyzed by Py-GC/MS, 2D-NMR, and GPC, and their characteristics were compared to the “milled-wood” lignin of the raw material...

The enzymatic oxidative polymerization of five technical lignins with different molecular properties, i.e. Soda Grass/Wheat straw Lignin, Organosolv Hardwood Lignin, Soda Wheat straw Lignin, Alkali pretreated Wheat straw Lignin, and Kraft Softwood was studied. All lignins were previously fractionated by acetone/water 50:50 (v/v) and the laccase-catalyzed polymerization of the low molecular weig...

Technical soda lignin dissolved in urea as an environmental friendly binder in wood fiberboard Hongli Zhu, Yuanyuan Li, Bert Pettersson, Liming Zhang, Mikael Lindström & Gunnar Henriksson To cite this article: Hongli Zhu, Yuanyuan Li, Bert Pettersson, Liming Zhang, Mikael Lindström & Gunnar Henriksson (2014) Technical soda lignin dissolved in urea as an environmental friendly binder in wood fib...

BACKGROUND Current single-stage delignification-pretreatment technologies to overcome lignocellulosic biomass recalcitrance are usually achieved at the expense of compromising the recovery of the polysaccharide components, particularly the hemicellulose fraction. One way to enhance overall sugar recovery is to tailor an efficient two-stage pretreatment that can pre-extract the more labile hemic...

The study aims to compare the lignin extraction methods of OPEFB using different solvents; soda and dioxane solvent, reinforcement effects in polylactic acid (PLA) bio-composite. Different method has been found produce with properties purity. yield also highly dependent on types solvents used process. Soda treatment had shown a good removal 17.4 % yield, but only 8.08 for treatment. In contrast...