Double Oxidants Combined Oxidation of Oleic Acid Preparation of Azelaic Acid

2013 ◽  
Vol 804 ◽  
pp. 94-97
Author(s):  
Chun Wei Shi ◽  
Xiao Yan Zhang ◽  
Shan Lin Zhao ◽  
Ping Chen ◽  
Yu Ting Bai
Keyword(s):  
Hydrogen Peroxide ◽  
Oleic Acid ◽  
Reaction Time ◽  
Reaction Temperature ◽  
Azelaic Acid ◽  
Phosphotungstic Acid ◽  
Hydrogen Peroxide Solution ◽  
Acid Hydrate ◽  
Major Factors

Oleic acid was oxidized to azelaic acid by ozone and hydrogen peroxide as an oxidant jointly in this paper. The effect of major factors, such as the volume and concentration of hydrogen peroxide, the volume and concentration of ozone. The results show that the yield of azelaic acid was up to 71 %, when the oxidation was taken under the following condition: oleic acid 20g, phosphotungstic acid hydrate 0.6g , 30% hydrogen peroxide solution 60ml, reaction temperature 70°C, reaction time 8h.

scholarly journals Catalytic Degradation of Chitosan by Supported Heteropoly Acids in Heterogeneous Systems

Catalysts ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1078
Author(s):  
Hang Zhang ◽  
Zhipeng Ma ◽  
Yunpeng Min ◽  
Huiru Wang ◽  
Ru Zhang ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Molecular Weight ◽  
Catalytic Activity ◽  
Activated Carbon ◽  
Reaction Time ◽  
High Molecular Weight ◽  
Reaction Temperature ◽  
Water Soluble ◽  
High Catalytic Activity ◽  
High Molecular Weight Chitosan

Several kinds of composite materials with phosphotungstic acid (PTA) as the catalyst were prepared with activated carbon as support, and their structures were characterized. According to the Box–Behnken central combination principle, the mathematical model of the heterogeneous system is established. Based on the single-factor experiments, the reaction temperature, the reaction time, the amount of hydrogen peroxide and the loading capacity of PTA were selected as the influencing factors to study the catalyzed oxidation of hydrogen peroxide and degradation of high molecular weight chitosan. The results of IR showed that the catalyst had a Keggin structure. The results of the mercury intrusion test showed that the pore structure of the supported PTA catalyst did not change significantly, and with the increase of PTA loading, the porosity and pore volume decreased regularly, which indicated that PTA molecules had been absorbed and filled into the pore of activated carbon. The results of Response Surface Design (RSD) showed that the optimum reaction conditions of supported PTA catalysts for oxidative degradation of high molecular weight chitosan by hydrogen peroxide were as follows: reaction temperature was 70 ℃, reaction time was 3.0 h, the ratio of hydrogen peroxide to chitosan was 2.4 and the catalyst loading was 30%. Under these conditions, the yield and molecular weight of water-soluble chitosan were 62.8% and 1290 Da, respectively. The supported PTA catalyst maintained high catalytic activity after three reuses, which indicated that the supported PTA catalyst had excellent catalytic activity and stable performance compared with the PTA catalyst.

Preparation of 4-Hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl A Reinvestigation of Methods Using Hydrogen Peroxide in the Presence of Catalysts

1976 ◽  
Vol 31 (10) ◽  
pp. 1376-1378 ◽  
Author(s):  
G. Sosnovsky ◽  
M. Konieczny
Keyword(s):  
Hydrogen Peroxide ◽  
Phosphotungstic Acid ◽  
Sodium Tungstate ◽  
Spin Labeling ◽  
Quantitative Yield ◽  
Hydrogen Peroxide Solution ◽  
Aqueous Hydrogen Peroxide ◽  
Molar Excess

The preparation of the key intermediate for spin labeling, 4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl (2), was reinvestigated using sodium tungstate or phosphotungstic acid with or without either Trilon or Triton B. A two-fold and a 3.5-fold molar excess of a 30% aqueous hydrogen peroxide solution was used. The oxidation of 4-hydroxy-2,2,6,6-tetramethylpiperidine (1) with a two-fold molar excess of a 30% aqueous hydrogen peroxide solution in the presence of sodium tungstate alone, under vigorous stirring for two hours, is the superior method (A) for the preparation of 2 in virtually quantitative yield.

Application of Taguchi Optimization Method in Improving the Selectivity of Dihydroxystearic Acid

2015 ◽  
Vol 1113 ◽  
pp. 703-709 ◽  
Author(s):  
Siti Khatijah Jamaludin ◽  
Ku Halim Ku Hamid ◽  
Hazimah Abu Hassan ◽  
Ayub Md Som ◽  
Zulina Maurad ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Oleic Acid ◽  
Taguchi Method ◽  
Formic Acid ◽  
Reaction Temperature ◽  
Operating Conditions ◽  
Optimum Operating ◽  
Dihydroxystearic Acid ◽  
Catalyst Loading ◽  
Taguchi Optimization

Dihydroxystearic acid (DHSA) is perceived to be of significant value to various types of industries, especially the oleochemical industry. It is produced by reacting palm-based crude oleic acid (OA) with formic acid and hydrogen peroxide through thein situepoxidation-dihydroxylation, a multistep reaction process. Optimization of the reaction’s operating conditions with respect to the selectivity of DHSA was conducted via the Taguchi method of optimization. The selectivity of DHSA was determined based on gas chromatography (GC) analysis. The signal-to-noise (S/N) ratio analysis procedure in Taguchi method revealed that the optimum operating conditions for the production of crude DHSA with respect to its selectivity were found to be: catalyst (sulphuric acid) loading at 0.5 gm, formic acid-to-oleic acid unsaturation mole ratio of 1:1, hydrogen peroxide-to-oleic acid unsaturation mole ratio of 0.75:1 and reaction temperature: 85°C. ANOVA tested at 90% confidence level revealed that reaction temperature and catalyst loading highly affect the selectivity of DHSA. The selectivity of DHSA was improved to 97.2% by applying the optimum operating conditions as obtained by Taguchi method.

Catalytic Cracking of Oleic Acid over Zeolites

2019 ◽  
Vol 814 ◽  
pp. 517-521
Author(s):  
Md Amirul Alam Kanak ◽  
Ji Yeon Park ◽  
In Gu Lee
Keyword(s):  
Fatty Acids ◽  
Oleic Acid ◽  
Reaction Time ◽  
Reaction Temperature ◽  
Catalytic Cracking ◽  
Gasoline Fraction ◽  
Coffee Waste ◽  
Bio Oil ◽  
Zeolite Type ◽  
Mcm 41

Compared with bio-oil from sawdust (common lignocellulosic biomass), the bio-oil obtained by fast pyrolysis of coffee waste has a unique feature to contain a significant amount of fatty acids such as oleic acid and palmitic acid. It is necessary to conduct C-C cracking of fatty acids present in coffee-waste bio-oil to maximize gasoline fraction (C5-C12) production. In this work, catalytic cracking of oleic acid as a model compound for the fatty acids was carried out in batch reactors to understand the effect of major parameters such as zeolite type (HZSM-5, SAPO-11, MCM-41), reaction temperature (380-500 °C), and reaction time (0-50 min) on gasoline fraction production. The GC-MS analysis showed hydrocarbons and aromatics to be major compounds present in the gasoline fraction irrespective of zeolite type and reaction conditions. At 400 °C and 0 min reaction time, the yield of gasoline fraction was 18.6, 6.7, and 33.1 % with HZSM-5, SAPO-11, and MCM-41, respectively. As reaction temperature increased to 500 °C, the total gasoline fraction yield reached 43.7 and 22.7 % with SAPO-11 and MCM-41, respectively. In all the catalysts, the content of aromatic compounds in the gasoline fraction increased with the increase in reaction temperature and reaction time. Meanwhile, the formation of hydrocarbons in the gasoline fraction showed different optimum temperature with catalyst: 11.8 % yield with SAPO-11 at 500 °C and 27.0 % yield with MCM-41 at 400 °C.

Removal of Manganese(II) Ions from Wastewater by H2O2 as Oxidant

2014 ◽  
Vol 884-885 ◽  
pp. 125-128
Author(s):  
Wen Qiang Yang ◽  
Juan An ◽  
Jian Guo Yin ◽  
Xiao Li Yuan ◽  
Wen Tang Xia
Keyword(s):  
Hydrogen Peroxide ◽  
Reaction Time ◽  
Calcium Oxide ◽  
Reaction Temperature ◽  
Removal Rate ◽  
Treated Wastewater ◽  
Manganese Removal

Removal of manganese (II) ions from wastewater by H2O2as oxidant was studied. Effects of reaction temperature, hydrogen peroxide concentration, reaction time and calcium oxide concen-tration on the manganese removal were investigated. The results indicated that the removal rate of manganese exceeded 99.9% and the Mn (II) ions concentration of treated wastewater was lower than 0.1 mg·L-1under the conditions of reaction temperature 55 °C, concentration of H2O20.1 mL·L-1, reaction time 70 min, concentration of CaO 0.25 g·L-1.

Research on Synthesis Regularity of Epoxysuccinic Acid

2013 ◽  
Vol 316-317 ◽  
pp. 942-945
Author(s):  
Qing He Gao ◽  
Yi Can Wang ◽  
Zhi Feng Hou ◽  
Hui Juan Qian ◽  
Yuan Zhang ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Reaction Time ◽  
Maleic Anhydride ◽  
Reaction Temperature ◽  
Raw Material ◽  
Molar Ratio ◽  
Mass Ratio ◽  
Synthesis System ◽  
Reaction Conditions ◽  
Sodium Hydrate

The yield of epoxysuccinic acid was obtained by determining the content of unreacted maleic anhydride and tartaric acid as a by-product in synthesis system. This method could calculate the yield of epoxysuccinic acid precisely and overcome the disadvantage of obtaining inpure product by recrystallization method. Epoxysuccinic Acid was synthesized using maleic anhydride as raw material, hydrogen peroxide as oxidizer and tungstate as catalyst. The effects of reaction temperature, reaction time, ratio of materials, dosage of oxidizer and catalyst on epoxidation and hydrolysis reaction was investigated. The results showed that the yield of epoxysuccinic acid was 88% when the reaction conditions were as follows: reaction temperature 65°C, reaction time 1.5h, catalyst dosage 3%(based on mass of maleic anhydride), molar ratio of sodium hydrate to maleic anhydride 2:1, mass ratio of hydrogen peroxide to maleic anhydride 1:1.

Sodium stannate promoted double bond cleavage of oleic acid by hydrogen peroxide over a heterogeneous WO3catalyst

2018 ◽  
Vol 20 (15) ◽  
pp. 3619-3624 ◽  
Author(s):  
Xiukai Li ◽  
Joel Choo Ping Syong ◽  
Yugen Zhang
Keyword(s):  
Hydrogen Peroxide ◽  
Oleic Acid ◽  
Double Bond ◽  
Tungsten Oxide ◽  
Azelaic Acid ◽  
Bond Cleavage ◽  
Nonanoic Acid ◽  
Reaction Efficiency ◽  
Sodium Stannate

A sodium stannate additive notably improved the reaction efficiency of tungsten oxide catalysed oleic acid (OA) cleavage by hydrogen peroxide to produce azelaic acid and nonanoic acid.

Highly efficient oxidation of chromium (III) with hydrogen peroxide in alkaline medium

2019 ◽  
Vol 79 (2) ◽  
pp. 366-374 ◽  
Author(s):  
Hao Peng ◽  
Jing Guo ◽  
Gang Li ◽  
Qinzhe Cheng ◽  
Yuju Zhou ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Reaction Time ◽  
Alkaline Medium ◽  
Reaction Temperature ◽  
Volume Ratio ◽  
High Energy ◽  
Utilization Efficiency ◽  
Water Leaching ◽  
Stirring Rate ◽  
Oxidation Efficiency

Abstract Many technologies have been proposed to oxidize chromium, such as roasting-water leaching technology and hydrometallurgical methods such as pressure oxidative leaching coupled with oxygen, ozone, permanganate and ferrate, but the problems associated with the high temperature, low overall resource utilization efficiency, high energy consumption, and the environmental pollution, still remain unsolved. This paper focuses on the oxidation process of chromium (III) with hydrogen peroxide (H2O2) in an alkaline medium. The effect of parameters including dosage of H2O2, dosage of NaOH, reaction time, reaction temperature and stirring rate on the oxidation efficiency of chromium were investigated. The oxidation efficiency was significantly affected by the dosage of H2O2 and NaOH, reaction time and reaction temperature took second place; last was the stirring rate. Oxidation efficiency was nearly 100% under the optimal conditions: volume ratio of H2O2 to mass of Cr2(SO4)3 of 2.4 mL/g, mass ratio of NaOH to Cr2(SO4)3 0.6 g/g, reaction time of 90 min, reaction temperature of 90 °C and stirring rate of 500 rpm.

Selectively Catalyzed Oxidation of Benzyl Alcohol by FeIII–TAML/Hydrogen Peroxide

2015 ◽  
Vol 723 ◽  
pp. 601-604 ◽  
Author(s):  
Ran Li ◽  
Ge Wang ◽  
Yan Chun Liu ◽  
Xiao Bin Chen ◽  
Zhi Min Sun ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Reaction Time ◽  
Benzyl Alcohol ◽  
Reaction Temperature ◽  
Oxidation Reaction ◽  
Macrocyclic Ligands ◽  
Temperature Reaction ◽  
Oxidation Of Benzyl Alcohol ◽  
Catalyzed Oxidation

Benzyl alcohol was selectively oxidized to benzaldehyde with iron (III) complexed to tetra amido macrocyclic ligands (FeIII–TAML) as catalyst and 30% H2O2 as oxidant. The effect of reaction temperature, reaction time, solvent, amount of catalyst and oxidant on the reaction of catalyzed oxidation of benzyl alcohol were explored. The conversion and selectivity of this oxidation reaction were calculated from calibrated GC yields of benzyl alcohol and benzaldehyde. When oxidation reaction was conducted under the conditions: solvent NMMO: ethanol = 1: 1, n (H2O2): n (benzyl alcohol) = 2, n (catalyst): n (benzyl alcohol) = 1%, temperature 80 ̊C and reaction time 60 minutes, the conversion was 91.23% and the selectivity was 90.12%.

scholarly journals Synthesizing environmentally friendly non-silicone oxygen bleaching stabilizer for linen yarn using oligomeric acrylic acid

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jie Liu ◽  
Chun Lv
Keyword(s):  
Hydrogen Peroxide ◽  
Reaction Time ◽  
Acrylic Acid ◽  
Reaction Temperature ◽  
Metal Ion ◽  
Monomer Concentration ◽  
Environmentally Friendly ◽  
Test Method ◽  
Magnesium Salt ◽  
Oxygen Bleaching

AbstractUsing potassium peroxodisulfate as an initiator and acrylic acid as a monomer, an acrylic acid oligomer was synthesized and then compounded with magnesium salt to form a non-silicone oxygen bleaching stabilizer. By investigating the effects of reaction temperature, reaction time, initiator concentration, monomer concentration, and magnesium salt dosage on product performance, the effect of stabilizers on linen yarn bleaching was analyzed. The synthetic conditions of oxygen bleaching stabilizer were determined by orthogonal test method, namely, acrylic acid monomer concentration 25%, initiator dosage 5%, oligomeric acrylic acid and magnesium salt compound ratio 5:1, reaction temperature 65 °C, reaction time 4 h. At this time, the chelated iron value of the product was as high as 239.314 mg/g, and the chelated calcium value also reached 145.000 mg/g. The dosage of the synthesized stabilizer were determined to be 4 g/L through indicators such as the decomposition rate of hydrogen peroxide and whiteness. The results showed that the environmentally friendly non-silicone oxygen bleaching stabilizer not only had a good ability to inhibit the decomposition of hydrogen peroxide, but also provided bleached linen yarn with a superior degree of whiteness and less metal ion residue, which can effectively solve the “silicon scale” problem and improve the quality of the pre-treatmented products.

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