On the photochemical formation of peroxide in the system disodium Anthraquinone-2,6-disulfonate-methylviologen-water-ethanol-sodium hydroxide

1982 ◽  
Vol 35 (8) ◽  
pp. 1723 ◽  
Author(s):  
AWH Mau ◽  
WHF Sasse
Keyword(s):  
Hydrogen Peroxide ◽  
Sodium Hydroxide ◽  
Spectroscopic Evidence ◽  
Photochemical Formation ◽  
Title System

Reduction of oxygen by anthraquinone radicals is shown to be responsible for the formation of hydrogen peroxide in the title system. Spectroscopic evidence indicates that the hydroquinone is formed by photoreduction of the anthraquinone through sequential one-electron steps.

Bleaching optimization at WestRock mill in Covington, Virginia

TAPPI Journal ◽  
2016 ◽  
Vol 15 (9) ◽  
pp. 581-586 ◽  
Author(s):  
RICARDO B. SANTOS ◽  
PETER W. HART ◽  
DOUGLAS C. PRYKE ◽  
JOHN VANDERHEIDE
Keyword(s):  
Hydrogen Peroxide ◽  
Sodium Hydroxide ◽  
Chlorine Dioxide ◽  
Capital Expenditures ◽  
Equipment Repair ◽  
Optimization Program ◽  
Hardwood Pulp ◽  
Improved Performance

The WestRock mill in Covington, VA, USA, initiated a long term diagnostic and optimization program for all three of its bleaching lines. Benchmarking studies were used to help identify optimization opportunities. Capital expenditures for mixing improvement, filtrate changes, equipment repair, other equipment changes, and species changes were outside the scope of this work. This focus of this paper is the B line, producing southern hardwood pulp in a D(EP)DD sequence at 88% GE brightness. The benchmarking study and optimization work identified the following opportunities for improved performance: nonoptimal addition of caustic and hydrogen peroxide to the (EP) stage, carryover of D0 filtrate to the (EP) stage, and carryover of (EP) filtrate to the D1 stage. As a result of actions the mill undertook to address these opportunities, D0 kappa factor decreased about 5%, sodium hydroxide consumption in the (EP) stage decreased about 35%, chlorine dioxide consumption in the D1 stage decreased about 25%, and overall bleaching cost decreased about 15%.

Production of monosaccharides from poplar by a two-step hydrogen peroxide-acetic acid and sodium hydroxide pretreatment

2021 ◽  
Vol 170 ◽  
pp. 113820
Author(s):  
Hong Liao ◽  
Jiaxin You ◽  
Peiyao Wen ◽  
Wenjun Ying ◽  
Qianqian Yang ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Acetic Acid ◽  
Sodium Hydroxide

Renewable Sugars Hydrolyzed from Banana Pseudo-Stem Using Different Chemical Pretreatments

2013 ◽  
Vol 372 ◽  
pp. 97-100 ◽  
Author(s):  
Mohammad Aisah ◽  
Surip Siti Norasmah ◽  
Ibrahim Wan Asma
Keyword(s):  
Hydrogen Peroxide ◽  
Sodium Hydroxide ◽  
Sulphuric Acid ◽  
Plant Cell Wall ◽  
Biofuel Production ◽  
Acid Mixture ◽  
Natural Material ◽  
Hydrolysis Time ◽  
Chemical Pretreatments ◽  
Renewable Sugars

Cellulose and hemicelluloses are the main building block of plant cell wall and are known as a natural polymer that usually used in the industries. Cellulose and hemicelluloses could be used as a feedstock for second generation biofuel production where it is subjected to hydrolysis into sugar after which it can be converted into bioethanol through fermentation process. In this study, the matured banana pseudo-stem is used as the source of hydrolyzing sugar from natural material. The objective of this research is to study the effects of different chemical pretreatments (sodium hydroxide, mixture of sodium hydroxide and hydrogen peroxide, sulphuric acid, mixture of sulphuric acid and hydrogen peroxide) and hydrolysis time (1-5 hours) on the sugar yield from banana pseudo-stem. Results showed that, after 3 hours hydrolysis most of the sugars from all chemical pretreatments reduced gradually. Analysis of sugar contents from acid hydrolysis process using High Pressure Liquid Chromatography (HPLC) showed that all the samples contained glucose, xylose, and arabinose where the highest glucose (16.02 mg/L) obtained from fiber treated with mixture of 1.0 M sulphuric acid and hydrogen peroxide. In addition, both highest xylose (64.23 mg/L) and arabinose (45.78 mg/L) are obtained from fiber treated with 0.5 M sodium hydroxide.

scholarly journals Deep insights into the atmospheric Sodium hydroxide-hydrogen peroxide extraction process of hemicellulose in bagasse

Authorea ◽  
2020 ◽  
Author(s):  
Dong Chen ◽  
Shibo Yang ◽  
Lincai Peng ◽  
Junhua Zhang ◽  
Liang He ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Sodium Hydroxide ◽  
Extraction Process

scholarly journals The role of polysaccharides and diatom exudates in the redox cycling of Fe and the photoproduction of hydrogen peroxide in coastal seawaters

2009 ◽  
Vol 6 (4) ◽  
pp. 7789-7819 ◽  
Author(s):  
S. Steigenberger ◽  
P. J. Statham ◽  
C. Völker ◽  
U. Passow
Keyword(s):  
Hydrogen Peroxide ◽  
Coastal Waters ◽  
Phaeodactylum Tricornutum ◽  
Laboratory Experiments ◽  
Uv Light ◽  
H2o2 Production ◽  
Initial Value ◽  
Photochemical Formation ◽  
Algal Exudates

Abstract. The effect of artificial acidic polysaccharides (PS) and exudates of Phaeodactylum tricornutum on the half-life of Fe(II) in seawater was investigated in laboratory experiments. Strong photochemical hydrogen peroxide (H2O2) production of 5.2 to 10.9 nM (mg C)−1 h−1 was found in the presence of PS and diatom exudates. Furthermore when illuminated with UV light the presence of algal exudates had a net stabilising effect on ferrous iron in seawater (initial value 100 nmol L−1) above that expected from oxidation kinetics. In the dark the PS gum xanthan showed no stabilising effect on Fe(II). The photochemical formation of superoxide (O2−) in presence of diatom exudates and its reducing effect on Fe(III) appears to result in greater than expected concentrations of Fe(II). A model of the photochemical redox cycle of iron incorporating these processes supported the observed data well. Diatom exudates seem to play an important role for the photochemistry of iron in coastal waters.

scholarly journals Bleaching Flax Roving With Poly(Acrylic Acid) Magnesium Salt As Oxygen Bleaching Stabilizer For Hydrogen Peroxide

2021 ◽  
Author(s):  
Jie Liu ◽  
Wenqi Jiang ◽  
Ling Sun ◽  
Chun Lv
Keyword(s):  
Hydrogen Peroxide ◽  
Acrylic Acid ◽  
Sodium Hydroxide ◽  
Sodium Silicate ◽  
Magnesium Salt ◽  
Capillary Effect ◽  
Sodium Hydroxide Concentration ◽  
Silicon Oxygen ◽  
Oxygen Bleaching ◽  
Poly Acrylic Acid

Abstract Alkali-oxygen one-bath scouring and bleaching process of the flax roving was studied by using a new type of synthesized non-silicon oxygen bleaching stabilizer Poly(acrylic acid) magnesium instead of sodium silicate. Based on the analysis of the effects of single factors such as sodium hydroxide concentration, hydrogen peroxide concentration, temperature, time and the amount of the synthesized non-silicon oxygen bleaching stabilizer poly(acrylic acid) magnesium salt on the performance of the bleached flax roving, including the whiteness, the breaking tenacity, the capillary effect and the weight loss ratio. The optimal process for the application of the stabilizer was determined by orthogonal test, namely, hydrogen peroxide concentration 8.5 g/L, sodium hydroxide concentration 5 g/L, sodium bisulfite 3 g/L, sodium carbonate 3 g/L, the synthesized non-silicon oxygen bleaching stabilizer poly(acrylic acid) magnesium 5.5 g/L, scoured and bleached at 90 ℃ for 60 min, and the bath ratio was 25:1. Compared with the traditional oxygen bleaching stabilizer sodium silicate, it not only has good ability to inhibit the rapid decomposition of hydrogen peroxide, but also has the advantages of higher whiteness, higher capillary effect, good feel and breaking tenacity, and can effectively solve the "silicon scale" problem and improve the quality of flax products.

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