OXIDATION OF THE WATER-PHENOL-ACETON SYSTEM 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
Russian Federation
Russian Federation
5.
Kazan National Research Technological University
Russian Federation
Russian Federation
6.
Kazan National Research Technological University
Type:
Article
Pages:
from 42
to 48
Status:
Published
Received:
27.01.2026
Accepted:
28.01.2026
Published:
28.01.2026
Language:
Russian
Keywords:
SUPERCRITICAL WATER OXIDATION, PHENOL, ACETONE, CHEMICAL OXYGEN DEMAND, ACETIC ACID
Abstract:
The relevance of this study is driven by the acute need to develop highly efficient and environmentally friendly methods for the treatment of high-strength wastewater from chemical industries, such as PJSC "Kazanorgsintez". Conventional treatment methods fail to ensure the complete destruction of toxic organic compounds, represented in this study by phenol and acetone, leading to their persistent negative impact on the environment. The aim of this work was a comprehensive investigation of the supercritical water oxidation (SCWO) process of a model "water-phenol-acetone" system to determine the optimal parameters for advanced purification and to assess the possibility of selectively obtaining a valuable chemical product. The experimental process was conducted in a continuous-flow mode across a broad temperature range of 523-873 K and a constant pressure of 25 MPa, using air oxygen as the oxidant (excess oxygen ratio of 10-30) and variable residence times of 2 and 4 minutes. The process efficiency was evaluated based on the dynamics of changes in COD, pH, the overall conversion degree, and the detailed composition of the reaction products, determined by GC-MS and acid-base titration methods. It was established that an increase in temperature, reaction time, and excess oxygen ratio results in a significant reduction of COD from the initial 4808 mgO2/L to a record low of 94 mgO2/L, corresponding to a conversion degree of up to 98.3%. Under mild conditions (523 K, excess oxygen ratio=10, 2 min), the primary oxidation intermediate is acetic acid, with a maximum yield of 74.91%. Under severe parameters, complete mineralizing oxidation of organics to CO2 and H2O occurs. Thus, SCWO technology has proven to be exceptionally effective for the advanced treatment of complex industrial effluents to meet stringent environmental standards. Additionally, the potential for the targeted production of acetic acid as a valuable product under mild conditions was identified, which adds comprehensive economic viability to the technology and expands its scope of practical application.
The relevance of this study is driven by the acute need to develop highly efficient and environmentally friendly methods for the treatment of high-strength wastewater from chemical industries, such as PJSC "Kazanorgsintez". Conventional treatment methods fail to ensure the complete destruction of toxic organic compounds, represented in this study by phenol and acetone, leading to their persistent negative impact on the environment. The aim of this work was a comprehensive investigation of the supercritical water oxidation (SCWO) process of a model "water-phenol-acetone" system to determine the optimal parameters for advanced purification and to assess the possibility of selectively obtaining a valuable chemical product. The experimental process was conducted in a continuous-flow mode across a broad temperature range of 523-873 K and a constant pressure of 25 MPa, using air oxygen as the oxidant (excess oxygen ratio of 10-30) and variable residence times of 2 and 4 minutes. The process efficiency was evaluated based on the dynamics of changes in COD, pH, the overall conversion degree, and the detailed composition of the reaction products, determined by GC-MS and acid-base titration methods. It was established that an increase in temperature, reaction time, and excess oxygen ratio results in a significant reduction of COD from the initial 4808 mgO2/L to a record low of 94 mgO2/L, corresponding to a conversion degree of up to 98.3%. Under mild conditions (523 K, excess oxygen ratio=10, 2 min), the primary oxidation intermediate is acetic acid, with a maximum yield of 74.91%. Under severe parameters, complete mineralizing oxidation of organics to CO2 and H2O occurs. Thus, SCWO technology has proven to be exceptionally effective for the advanced treatment of complex industrial effluents to meet stringent environmental standards. Additionally, the potential for the targeted production of acetic acid as a valuable product under mild conditions was identified, which adds comprehensive economic viability to the technology and expands its scope of practical application.
Keywords:
SUPERCRITICAL WATER OXIDATION, PHENOL, ACETONE, CHEMICAL OXYGEN DEMAND, ACETIC ACID
SUPERCRITICAL WATER OXIDATION, PHENOL, ACETONE, CHEMICAL OXYGEN DEMAND, ACETIC ACID
