A technical and economic analysis of acid-catalyzed steam explosion and dilute sulfuric acid pretreatments using wheat straw or aspen wood chips

1991 ◽  
Vol 28-29 (1) ◽  
pp. 87-97 ◽  
Author(s):  
D. J. Schell ◽  
R. Torget ◽  
A. Power ◽  
P. J. Walter ◽  
K. Grohmann ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Economic Analysis ◽  
Wheat Straw ◽  
Steam Explosion ◽  
Wood Chips ◽  
Aspen Wood ◽  
Dilute Sulfuric Acid ◽  
Technical And Economic Analysis ◽  
Acid Catalyzed

scholarly journals Hydrothermal Pretreatment of Wheat Straw: Effects of Temperature and Acidity on Byproduct Formation and Inhibition of Enzymatic Hydrolysis and Ethanolic Fermentation

Agronomy ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 487
Author(s):  
Dimitrios Ilanidis ◽  
Stefan Stagge ◽  
Leif J. Jönsson ◽  
Carlos Martín
Keyword(s):  
Mass Spectrometry ◽  
Sulfuric Acid ◽  
Wheat Straw ◽  
High Performance ◽  
Enzymatic Saccharification ◽  
Hydrothermal Pretreatment ◽  
Gas Chromatography Mass Spectrometry ◽  
Enzymatic Digestibility ◽  
Acid Catalyzed ◽  
Pretreatment Conditions

Biochemical conversion of wheat straw was investigated using hydrothermal pretreatment, enzymatic saccharification, and microbial fermentation. Pretreatment conditions that were compared included autocatalyzed hydrothermal pretreatment at 160, 175, 190, and 205 °C and sulfuric-acid-catalyzed hydrothermal pretreatment at 160 and 190 °C. The effects of using different pretreatment conditions were investigated with regard to (i) chemical composition and enzymatic digestibility of pretreated solids, (ii) carbohydrate composition of pretreatment liquids, (iii) inhibitory byproducts in pretreatment liquids, (iv) furfural in condensates, and (v) fermentability using yeast. The methods used included two-step analytical acid hydrolysis combined with high-performance anion-exchange chromatography (HPAEC), HPLC, ultra-high performance liquid chromatography-electrospray ionization-triple quadrupole-mass spectrometry (UHPLC-ESI-QqQ-MS), and pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). Lignin recoveries in the range of 108–119% for autocatalyzed hydrothermal pretreatment at 205 °C and sulfuric-acid-catalyzed hydrothermal pretreatment were attributed to pseudolignin formation. Xylose concentration in the pretreatment liquid increased with temperature up to 190 °C and then decreased. Enzymatic digestibility was correlated with the removal of hemicelluloses, which was almost quantitative for the autocatalyzed hydrothermal pretreatment at 205 °C. Except for the pretreatment liquid from the autocatalyzed hydrothermal pretreatment at 205 °C, the inhibitory effects on Saccharomyces cerevisiae yeast were low. The highest combined yield of glucose and xylose was achieved for autocatalyzed hydrothermal pretreatment at 190 °C and the subsequent enzymatic saccharification that resulted in approximately 480 kg/ton (dry weight) raw wheat straw.

Oil production by oleaginous yeasts using the hydrolysate from pretreatment of wheat straw with dilute sulfuric acid

2011 ◽  
Vol 102 (10) ◽  
pp. 6134-6140 ◽  
Author(s):  
Xiaochen Yu ◽  
Yubin Zheng ◽  
Kathleen M. Dorgan ◽  
Shulin Chen
Keyword(s):  
Sulfuric Acid ◽  
Wheat Straw ◽  
Oil Production ◽  
Oleaginous Yeasts ◽  
Dilute Sulfuric Acid

Optimization and kinetic analysis on the sulfuric acid – Catalyzed depolymerization of wheat straw

2015 ◽  
Vol 129 ◽  
pp. 79-86 ◽  
Author(s):  
Qian-Qian Wu ◽  
Yu-Long Ma ◽  
Xuan Chang ◽  
Yong-Gang Sun
Keyword(s):  
Sulfuric Acid ◽  
Kinetic Analysis ◽  
Wheat Straw ◽  
Acid Catalyzed

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.

Thioxanthene derivatives with neurotropic activity; synthesis of 9-(3-dimethylaminopropylidene)-2-(methylthiomethyl)thioxanthene and of some related compounds

1984 ◽  
Vol 49 (7) ◽  
pp. 1722-1730 ◽  
Author(s):  
Vojtěch Kmoníček ◽  
Václav Bártl ◽  
Miroslav Protiva
Keyword(s):  
Sulfuric Acid ◽  
Title Compound ◽  
Neurotropic Activity ◽  
Tertiary Alcohol ◽  
Dilute Sulfuric Acid ◽  
Acid Catalyzed ◽  
Sodium Methanethiolate ◽  
Related Compounds

A reaction of 2-(bromomethyl)thioxanthone with sodium methanethiolate with sodium methanethiolate gave 2-(methylthiomethyl)thioxanthone (II) which was transformed by treatment with 3-dimethylaminopropylmagnesium chloride to the tertiary alcohol IV. Its dehydration by heating with dilute sulfuric acid afforded the title compound I. An attempt at preparing the analogous 2-(methoxymethyl) derivative proceeded similarly but failed in the stage of the acid-catalyzed dehydration of the tertiary alcohol V. Acids VIII-XII and the nitrile XIII were prepared as potential intermediates. Compound I has properties of a tranquilizer with a weak cataleptic activity.

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