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.

Study on Liquefaction of Corncob in Polyhydric Alcohols

2011 ◽  
Vol 183-185 ◽  
pp. 1110-1113
Author(s):  
Yuan Bo Huang ◽  
Yun Wu Zheng ◽  
Hao Feng ◽  
Zhi Feng Zheng ◽  
Ying Zi Jiang
Keyword(s):  
Sulfuric Acid ◽  
Reaction Time ◽  
Reaction Temperature ◽  
Acid Number ◽  
Mass Ratio ◽  
Hydroxyl Number ◽  
Catalyst Amount ◽  
Peg 400 ◽  
Polyhydric Alcohols ◽  
Liquid Products

The liquefaction of corncob in polyhydric alcohols was investigated by using sulfuric acid as a catalyst. Results showed that the best liquefaction could be obtained with residue percent of 4.5% under the conditions with the corncob/polyhydric alcohols mass ratio of 1/5, reaction temperature of 150°C, reaction time of 60 min, catalyst amount of 3% (based on the weight of corncob), PEG 400/glycerin mass ratio of 7/3 in the polyhydric alcohols, respectively. The liquefied liquid products had acid number of 18.9 mg KOH/g and hydroxyl number of 616.3mg KOH/g, respectively.

Liquefaction of Cornstalk in the Presence of Polyhydric Alcohols

2011 ◽  
Vol 236-238 ◽  
pp. 341-345
Author(s):  
Xin Hui Yang ◽  
Yuan Bo Huang ◽  
Zhi Feng Zheng ◽  
Ya Dong Zhang
Keyword(s):  
Sulfuric Acid ◽  
Reaction Time ◽  
Reaction Temperature ◽  
Mild Condition ◽  
Acid Number ◽  
Hydroxyl Number ◽  
Reagent Ratio ◽  
Obvious Effect ◽  
Peg 400 ◽  
Polyhydric Alcohols

The liquefaction of cornstalk in the presence of polyhydric alcohols with sulfuric acid as catalyst was investigated. Effects of various liquefaction condition parameters on the liquefaction and its liquefied products were mainly investigated. Results showed that the liquefaction parameters had an obvious effect on the residue percent and the viscosity, acid and hydroxyl number of its liquefied products. The efficient liquefaction of cornstalk with low residue percent of 9.4% was obtained under the mild condition of a PEG #400/glycerin ratio of 7/3, a cornstalk/liquefaction reagent ratio of 1/5, a reaction temperature of 150°C, a reaction time of 30 min and a sulfuric acid amount of 4%, respectively. Under this condition, the viscosity, acid number and hydroxyl number of its liquefied products was 1430 cP, 18.5 mg KOH/g and 362.1 mg KOH/g, respectively.

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

scholarly journals Preparation and Characterization of Cellulose Nanocrystal Extraction From Pennisetum hydridum Fertilized by Municipal Sewage Sludge via Sulfuric Acid Hydrolysis

2021 ◽  
Vol 9 ◽  
Author(s):  
Xiaoshan Yu ◽  
Yu Jiang ◽  
Qitang Wu ◽  
Zebin Wei ◽  
Xianke Lin ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Reaction Time ◽  
Sewage Sludge ◽  
Acid Hydrolysis ◽  
Room Temperature ◽  
Raw Material ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge ◽  
Type I

This research focuses on the preparation of cellulose nanocrystals (CNCs) from Pennisetum hydridum fertilized by municipal sewage sludge (MSS) through sulfuric acid hydrolysis in different acid concentrations (40–65%), temperature (room temperature ∼55°C), and reaction time (50–120 min). The results showed that the obtained CNC possessed stable dispersion in water. The length of CNCs reached 272.5 nm under the condition of room temperature (RT), 65% acid concentration, and 120 min reaction time, and the diameter was within 10 nm. Furthermore, Fourier transform infrared (FTIR) showed that the CNC still kept the cellulose type I structure. The crystallinity of CNCs increased to the maximum by 18.34% compared with that of delignified Pennisetum hydridum fibers. Thermogravimetry (TG) illustrated the thermal stability of CNCs was lower than that of delignified Pennisetum hydridum fibers due to the introduction of sulfate groups in the cellulose. This study demonstrated that Pennisetum hydridum fertilized by MSS might be a suitable raw material for CNCs. This implies meaningful resource utilization of MSS and Pennisetum hydridum.

scholarly journals Characterization of Cellulose Microfibrils Obtained from Hemp

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Anna Šutka ◽  
Silvija Kukle ◽  
Janis Gravitis ◽  
Laima Grave
Keyword(s):  
Steam Explosion ◽  
Microfibrillated Cellulose ◽  
Cellulose Microfibrils ◽  
Fibre Size ◽  
Steam Explosion Pretreatment ◽  
Hemp Fibres ◽  
Before And After ◽  
Cellulose Fibrils ◽  
Scanning Electron

Microfibrillated cellulose was extracted from hemp fibres using steam explosion pretreatment and high-intensity ultrasonic treatment (HIUS). The acquired results after steam explosion treatment and water and alkali treatments are discussed and interpreted by Fourier transform infrared spectroscopy (FTIR). Scanning electron microscopy (SEM) was used to examine the microstructure of hemp fibres before and after each treatment. A fibre size analyser was used to analyse the dimensions of the untreated and treated cellulose fibrils. SEM observations show that the sizes of the different treated fibrils have a diameter range of several micrometres, but after HIUS treatment fibres are separate from microfibrils, nanofibres, and their agglomerates.

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