KINETICS OF THE OXIDATION REACTION OF OLEIC ACID BY HYDROGEN PEROXIDE IN AN AQUEOUS MEDIUM UNDER SUPERCRITICAL FLUID CONDITIONS
Rubrics: 2. CHEMICAL TECHNOLOGY
Authors:
1.
Kazan National Research Technological University
(Teoreticheskie osnovy teplotehniki)
FGBOU VO KNITU
Kazan, Russian Federation
FGBOU VO KNITU
Kazan, Russian Federation
2.
FGBOU VO "Kazanskiy nacional'nyy issledovatel'skiy tehnologicheskiy universitet"
(kafedra "Arhitektura i dizayn izdeliy iz drevesiny", docent)
employee from 01.01.2019 until now
Kazan, Kazan, Russian Federation
employee from 01.01.2019 until now
Kazan, Kazan, Russian Federation
3.
Kazan National Research Technological University
(Candidate of Technical Sciences; Assistant Professor of the Department of Chemical Engineering Process)
Russian Federation
Russian Federation
4.
Kazan National Research Technological University
5.
Kazan National Research Technological University
Type:
Article
Pages:
from 30
to 36
Status:
Published
Received:
27.01.2026
Accepted:
28.01.2026
Published:
28.01.2026
Language:
Russian
Keywords:
WATER, OLEIC ACID, HYDROGEN PEROXIDE, EMULSION, BINARY AND TERNARY MIXTURES, SCVO, RATE CONSTANT
Abstract:
This study presents a comprehensive experimental and theoretical analysis of the supercritical water oxidation (SCWO) of oleic acid used as a model compound to study the degradation of fatty acids in chemical waste. The SCWO method is recognized as one of the most promising environmentally friendly technologies for deep processing of organic waste based on the unique physicochemical properties of supercritical water. The kinetic aspects of the oxidation process with hydrogen peroxide in the temperature range of 673-723 K at a constant pressure of 29.4 MPa are studied. To overcome the problem of limited mutual solubility of reagents at room temperature, a technique for preparing a stable emulsion using ultrasonic dispersion on Hielscher UIP1000HD equipment was developed and optimized. The process efficiency was monitored through the change of the chemical oxygen demand (COD) index, and the qualitative and quantitative composition of the reaction products was analyzed using a set of modern analytical methods, including gas chromatography-mass spectrometry and FTIR spectroscopy. The obtained results demonstrate high efficiency of oleic acid oxidation under supercritical conditions with the conversion degree of 88.6% achieved at optimal process parameters. Kinetic analysis established that the reaction is first order, and the main identified oxidation product is acetic acid. The calculated kinetic parameters of the process include the activation energy of -94.82 kJ/mol and the pre-exponential factor of 25908 s⁻¹. The optimal temperature range of 750-800 K was determined theoretically based on the analysis of the dielectric characteristics of the system to ensure maximum mutual solubility of the reagents. The obtained scientific data make a significant contribution to the understanding of the SCWO mechanism of carboxylic acids and provide a fundamental basis for the design and optimization of industrial plants for the processing of organic waste.
This study presents a comprehensive experimental and theoretical analysis of the supercritical water oxidation (SCWO) of oleic acid used as a model compound to study the degradation of fatty acids in chemical waste. The SCWO method is recognized as one of the most promising environmentally friendly technologies for deep processing of organic waste based on the unique physicochemical properties of supercritical water. The kinetic aspects of the oxidation process with hydrogen peroxide in the temperature range of 673-723 K at a constant pressure of 29.4 MPa are studied. To overcome the problem of limited mutual solubility of reagents at room temperature, a technique for preparing a stable emulsion using ultrasonic dispersion on Hielscher UIP1000HD equipment was developed and optimized. The process efficiency was monitored through the change of the chemical oxygen demand (COD) index, and the qualitative and quantitative composition of the reaction products was analyzed using a set of modern analytical methods, including gas chromatography-mass spectrometry and FTIR spectroscopy. The obtained results demonstrate high efficiency of oleic acid oxidation under supercritical conditions with the conversion degree of 88.6% achieved at optimal process parameters. Kinetic analysis established that the reaction is first order, and the main identified oxidation product is acetic acid. The calculated kinetic parameters of the process include the activation energy of -94.82 kJ/mol and the pre-exponential factor of 25908 s⁻¹. The optimal temperature range of 750-800 K was determined theoretically based on the analysis of the dielectric characteristics of the system to ensure maximum mutual solubility of the reagents. The obtained scientific data make a significant contribution to the understanding of the SCWO mechanism of carboxylic acids and provide a fundamental basis for the design and optimization of industrial plants for the processing of organic waste.
Keywords:
WATER, OLEIC ACID, HYDROGEN PEROXIDE, EMULSION, BINARY AND TERNARY MIXTURES, SCVO, RATE CONSTANT
WATER, OLEIC ACID, HYDROGEN PEROXIDE, EMULSION, BINARY AND TERNARY MIXTURES, SCVO, RATE CONSTANT
