Hydrolysis of Bamboo Fiber for Production of Fermentable Sugars in Saturated Formic Acid

2012 ◽  
Vol 535-537 ◽  
pp. 2442-2445 ◽  
Author(s):  
Jun Ping Zhuang ◽  
Xue Ping Li
Keyword(s):  
Reaction Time ◽  
Hydrochloric Acid ◽  
Acid Solution ◽  
Formic Acid ◽  
Bamboo Fiber ◽  
Fermentable Sugars ◽  
Solution Temperature ◽  
Hydrochloric Acid Concentration ◽  
Formic Acid Solution ◽  
Hydrolysis Of

Bamboo is thought as an alternative feedstock for the production of fine chemicals, such as fuel ethanol and lactic acid to reduce our reliance on fossil fuels. Pretreatment is an essential step in the enzymatic hydrolysis of biomass for bioethanol production. In this study, hydrolysis of bamboo fiber for fermentable sugars production in hydrochloric acid used as a catalyst in saturated formic acid solution were studied. The purpose of this study is to investigate the effects of the hydrochloric acid concentration, temperature, the ratio of solid to liquid and reaction time on the fermentable sugars production. The optimum conditions were: adding 4% hydrochloric acid in saturated formic acid solution, temperature of 65 °C, 4% of the ratio of solid to solvent, with a reaction time of 90 min, under these conditions, the hydrolysate contained 23.52% glucose and 28.51% reducing sugars.

Production of Fermentable Sugars from Wheat Straw by Formic Acid Pretreatment

2012 ◽  
Vol 550-553 ◽  
pp. 1258-1261 ◽  
Author(s):  
Jun Ping Zhuang ◽  
Xue Ping Li ◽  
Ying Liu
Keyword(s):  
Reaction Time ◽  
Hydrochloric Acid ◽  
Formic Acid ◽  
Fossil Fuels ◽  
Structural Characteristics ◽  
Fermentable Sugars ◽  
Solution Temperature ◽  
Hydrochloric Acid Concentration ◽  
Acid Pretreatment ◽  
Hydrolysis Of Cellulose

Emerging biorefinery technologies offer a sustainable alternative through the utilisation of carbohydrates to reduce our reliance on fossil fuels. Cellulose molecules consist of long chains of glucose molecules as do starch molecules, but have a differentstructural configuration. These structural characteristics plus the encapsulation by lignin makes cellulosic materials more difficult to hydrolyze than starchy materials. In recent years, treatment of lignocellulosic biomass with dilute acid has been primarily used as a means of hemicellulose hydrolysis and pretreatment for enzymatic hydrolysis of cellulose and a significant advancement has also been found by adding hydrochloric acid with catalyst dosage in saturated formic acid. In the present work, the hydrochloric acid concentration, temperature, the ratio of solid to liquid and reaction time were prepared for the fermentable sugars production. The obtained optimum conditions were: adding 4% hydrochloric acid in saturated formic acid solution, temperature of 105 °C, with a reaction time of 90 min, and the maximum glucose and reducing sugars production were 26.84 g/L% and 27.4%, respectively.

A Study on Catalytic Hydrolysis of Corncob by Formic Acid

2012 ◽  
Vol 560-561 ◽  
pp. 321-324
Author(s):  
Jing Wen Xue ◽  
Zhe Wang
Keyword(s):  
Reaction Time ◽  
Hydrochloric Acid ◽  
Formic Acid ◽  
Degradation Products ◽  
Chemical Compositions ◽  
Catalytic Hydrolysis ◽  
Higher Temperature ◽  
Hydrolysis Residue ◽  
Hydrolysis Of

Corncob powder was hydrolyzed with formic acid under the catalyzation of hydrochloric acid. Sugar contents in hydrolysis liquor at different reaction time and temperature were determined. The chemical compositions in hydrolysis residue were also analyzed. Results showed that the formic acid could hydrolyze the polysaccharides in corncob and the degradation products were dissolved in hydrolysis liquor. The addition of catalytic hydrochloric acid accelerated the hydrolysis of polyose. The proper hydrolysis condition was 80°C for 3h. Lignin might undergo hydrolysis at higher temperature.

Kinetics of Bamboo Fiber Hydrolysis Reaction in Saturated Formic Acid

2012 ◽  
Vol 531-532 ◽  
pp. 679-683 ◽  
Author(s):  
Jun Ping Zhuang ◽  
Lu Lin ◽  
Chun Sheng Pang ◽  
Ying Liu
Keyword(s):  
Activation Energy ◽  
Hydrochloric Acid ◽  
Acid Solution ◽  
Formic Acid ◽  
Arrhenius Equation ◽  
Bamboo Fiber ◽  
Hydrolysis Reaction ◽  
Exponential Factor ◽  
Practical Applications ◽  
And Performance

Kinetic models can have practical applications for the optimization of the process and performance analysis, or economic estimations, so investigate the bamboo fiber kinetics is necessary. In this paper, effects of temperature and time on bamboo fiber hydrolysis in saturated formic acid with 4% hydrochloric acid solution reaction kinetics have been investigated. The rate constants, average apparent activation energy and frequency factors were evaluated according to the Arrhenius equation. The results showed that the hydrolysis velocities of bamboo fiber were 1.63×10-2 h-1 at 55 °C, 2.59×10-2 h-1 at 60 °C, 4.56×10-2 h-1 at 65 °C, 6.75×10-2 h-1 at 70 °C and 0.10 h-1 at 75 °C in formic acid solution with 4 % hydrochloric acid. The degradation velocities of glucose were 6.57×10-3 h-1 at 55 °C, 1.98×10-2 h-1 at 60 °C, 2.53×10-2 h-1 at 65 °C, 7.47×10-2 h-1 at 70 °C and 0.14 h-1 at 75 °C. The pre-exponential factor of Arrhenius equation of bamboo fiber hydrolysis reaction and glucose decomposition was 1.48×1014 h-1 and 2.32×1020 h-1 respectively. The activation energy of bamboo fiber hydrolysis was 87.65kJ/mol, and the activation energy of glucose degradation was 141.44kJ/mol.

Hydrogen?Oxygen Flame as a Radical Source for Aqueous-Phase Reaction: Carboxylation of Propylamine in Aqueous Formic Acid Solution

ChemInform ◽  
2005 ◽  
Vol 36 (15) ◽  
Author(s):  
Shinya Nomoto ◽  
Daisuke Yoshimura ◽  
Masayosi Hagiwara ◽  
Masaki Kozono ◽  
Masanori Terasaki ◽  
...  
Keyword(s):  
Acid Solution ◽  
Formic Acid ◽  
Aqueous Phase ◽  
Phase Reaction ◽  
Formic Acid Solution ◽  
Oxygen Flame ◽  
Aqueous Formic Acid

scholarly journals The UV-Vis Study On Anthocyanin Pigments Activities Extracted From Gayo Arabika Coffee Husks

Elkawnie ◽  
2019 ◽  
Vol 5 (2) ◽  
pp. 147
Author(s):  
Hasby Hasby ◽  
Nurhafidhah Nurhafidhah ◽  
Said Ali Akbar
Keyword(s):  
Hydrochloric Acid ◽  
Acid Solution ◽  
Absorption Peak ◽  
Solution Temperature ◽  
Arabica Coffee ◽  
Coffee Husk ◽  
Long Term Stability ◽  
Acidic Conditions ◽  
Anthocyanin Pigments

The anthocyanin activity of Gayo Arabica coffee husk in variations in acid solution, temperature, and pH has been assessed through UV-Vis studies. It is important to optimize these factors to increase the long-term stability of anthocyanins for use in various fields. Gayo Arabica coffee husks was extracted through maceration method with methanol. This process obtained a coffee husks extract of 1.176 mg/μL. The UV-Vis spectrum of the extract displayed the major absorption peak at λmax= 529 nm in hydrochloric acid (HCl), this assigned by the electronic transition from flavylium as the particular characteristic of anthocyanin compounds. The anthocyanin from the extract was stable at temperatures of 35oC and 50oC, to have a major absorption peak at λmax= 529 nm. Therefore, it could probably be said that the lower the temperature, the higher the absorbance value of anthocyanin. Then, husks extract was getting red at pH 1 and 3; almost colorless at pH 5, 8 and 10; and yellow at pH 12. The more acidic conditions causes more anthocyanin pigments to be observed in the form of flavylium or oxonium cations color. Finally, Gayo Arabica coffee husks extract can absorb both ultraviolet (UV) and visible light (visible).

Adsorption Behavior and Corrosion Inhibition of S-Benzyl o-Phenylenedioxydithiophosphate for Carbon Steel in Hydrochloric Acid Solution

2014 ◽  
Vol 937 ◽  
pp. 109-112
Author(s):  
Xiu Lan Zhang ◽  
Xiao Lin ◽  
Bin Xie ◽  
Li Ke Zou ◽  
Sha Sha Zhu ◽  
...  
Keyword(s):  
Weight Loss ◽  
Carbon Steel ◽  
Hydrochloric Acid ◽  
Acid Solution ◽  
Corrosion Inhibition ◽  
Hydrochloric Acid Solution ◽  
Hydrochloric Acid Concentration ◽  
Carbon Steel Surface ◽  
Effects Of Temperature ◽  
Mixed Type Inhibitor

The corrosion inhibition of S-benzyl o-phenylenedioxydithiophosphate (BPOTP), for carbon steel in hydrochloric acid solution was studied by electrochemical measurements and weight loss measurements. Polarization curves indicate BPOTP is a mixed-type inhibitor, and the effects of temperature, hydrochloric acid concentration and immersion time were also studied. The studies of weight loss measurement show that the inhibition efficiency was up to 92.82 % at the BPOTP concentration of 40 mg·L-1 in 1.0 M hydrochloric acid solution at 30°C. The adsorption of BPOTP on carbon steel surface obeys the Langmuir isotherm.

Dissolution of Mineral Fiber in a Formic Acid Solution: Kinetics, Modeling, and Gelation of the Resulting Sol

2008 ◽  
Vol 47 (24) ◽  
pp. 9834-9841 ◽  
Author(s):  
Henrik Grénman ◽  
Fernando Ramirez ◽  
Kari Eränen ◽  
Johan Wärnå ◽  
Tapio Salmi ◽  
...  
Keyword(s):  
Acid Solution ◽  
Formic Acid ◽  
Formic Acid Solution ◽  
Mineral Fiber ◽  
Kinetics Modeling ◽  
Solution Kinetics
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