Fractionation of Wheat Straw via Steam-Explosion Pretreatment. Characteristics of the Lignin Obtained by Alkali Delignification of the Steamed Straw

Holzforschung ◽  
1997 ◽  
Vol 51 (2) ◽  
pp. 135-141 ◽  
Author(s):  
Daniel Montané ◽  
Joan Salvadó ◽  
Xavier Farriol
Keyword(s):  
Wheat Straw ◽  
Steam Explosion ◽  
Steam Explosion Pretreatment

Steam explosion pretreatment of wheat straw to improve methane yields: Investigation of the degradation kinetics of structural compounds during anaerobic digestion

2015 ◽  
Vol 179 ◽  
pp. 299-305 ◽  
Author(s):  
Franz Theuretzbacher ◽  
Javier Lizasoain ◽  
Christopher Lefever ◽  
Molly K. Saylor ◽  
Ramon Enguidanos ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Wheat Straw ◽  
Steam Explosion ◽  
Degradation Kinetics ◽  
Steam Explosion Pretreatment ◽  
Kinetics Of

Preparation and Characterization of Liquefaction Polyol of Wheat-Straw Lignocellulose

2012 ◽  
Vol 472-475 ◽  
pp. 2828-2833
Author(s):  
Yan Qiao Jin ◽  
Yi Zhuan Zhang ◽  
Xian Su Cheng
Keyword(s):  
Sulfuric Acid ◽  
Reaction Time ◽  
Wheat Straw ◽  
Steam Explosion ◽  
Acid Value ◽  
Hydroxyl Value ◽  
Peg 400 ◽  
Steam Explosion Pretreatment ◽  
Liquefaction Temperature

In this study, wheat-straw lignocelluloses were liquefied in liquefaction solvents. Polyethyleneglycol 400 (PEG 400) and ethylene glycol (EG) were used as main liquefaction solvents. The effect of liquefaction time and liquefaction solvents on the properties of liquefied products was investigated. As the reaction time increased, the hydroxyl value, residue content and viscosity decreased, and the acid value decreased gradually in the previous period of time then increased. The optimum liquefaction conditions were as follows: wheat-straw lignocelluloses with steam-explosion pretreatment, the main liquefaction reagent of PEG 400, auxiliary liquefaction solvents of glycerin, catalyst of sulfuric acid, liquefaction temperature of 150°C, liquefaction time of 4 h. The hydroxyl value of liquefaction product was 206 mgKOH/g, the residue content was 0.19% and the viscosity was 88 mPa•s.

Steam Explosion Pretreatment and Ethanol Extraction of Wheat Straw

2011 ◽  
Vol 183-185 ◽  
pp. 635-638
Author(s):  
Lan Feng Hui ◽  
Ting Zhao ◽  
Chuan Ling Si ◽  
Zhong Liu
Keyword(s):  
Wheat Straw ◽  
Steam Explosion ◽  
High Performance ◽  
Reaction Times ◽  
Raw Material ◽  
Pulp Yield ◽  
Agricultural Residue ◽  
Steam Explosion Pretreatment ◽  
Different Temperatures ◽  
Chemical Products

It has been increasing the interest in the study of alternative pulping processes that conciliate high performance and protection to the environment. In the same way, the use of agricultural residues has been more and more reminded as promising raw material for production of bioethanol and chemical products. The wheat straw is a very abundant agricultural residue and it has been used in many countries for the production of cellulosic pulps. This work describes the effect of the pretreatment by steam explosion on the ethanol-water extraction of wheat straw. The samples of wheat straw were treated by steam explosion at 190°C and 210 °C for 4 minutes and later transferred to the treatment with ethanol-water (1:1, v:v) at different temperatures (140, 160 and 200 °C) and 60 minutes as reaction times. The pretreatment led to an increase in the amount of extracted lignin in the ethanol pulping. This effect was more pronounced in the pulping performed at lower temperatures. The use of higher temperatures in the treatment by steam explosion was more significant as shown by lower pulp yield and higher extractive extent.

scholarly journals An extensive parameter study of hydrotropic extraction of steam-pretreated birch

2021 ◽  
Author(s):  
Johanna Olsson ◽  
Michael Persson ◽  
Mats Galbe ◽  
Ola Wallberg ◽  
Ann-Sofi Jönsson
Keyword(s):  
Residence Time ◽  
Steam Explosion ◽  
Room Temperature ◽  
Initial Step ◽  
Parameter Study ◽  
Hydrothermal Degradation ◽  
Steam Explosion Pretreatment ◽  
Lignin Extraction ◽  
Extraction Step ◽  
Lignin Recovery

AbstractEfficient fractionation of lignocellulosic biomass is an important step toward the replacement of fossil-based products. However, the utilisation of all of the components in biomass requires various fractionation techniques. One promising process configuration is to apply steam explosion for the recovery of hemicelluloses and a subsequent hydrotropic extraction step for the delignification of the remaining solids. In this work, the influence of residence time, temperature and biomass loading on lignin recovery from birch using sodium xylene sulphonate as a hydrotrope was investigated. Our results show that residence time, temperature and biomass loading correlate positively with lignin extraction, but the effects of these parameters were limited. Furthermore, when steam explosion was implemented as the initial step, hydrotropic extraction could be performed even at room temperature, yielding a lignin extraction of 50%. Also, hydrothermal degradation of the material was necessary for efficient delignification with sodium xylene sulphonate, regardless of whether it occurs during steam explosion pretreatment or is achieved at high temperatures during the hydrotropic extraction.

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