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OPA oxidation rates in supercritical water
Bambang Veriansyah1, Jae-Duck Kim, Jong-Chol Lee
1Supercritical Fluid Research Laboratory, Clean Technology Research Center, Korea Institute of Science and Technology (KIST), 39-1 Hawolgok-dong, Seongbuk-gu, Seoul 136-791, Republic of Korea. vaveri@kist.re.kr
Journal of Hazardous Materials
|June 9, 2005
Summary
Supercritical water oxidation effectively destroys high-risk wastes. This study determined the oxidation rate of isopropyl amine (OPA) under SCWO conditions, yielding a global power-law rate expression for optimized waste treatment.
Area of Science:
- Environmental Chemistry
- Chemical Engineering
- Reaction Kinetics
Background:
- Supercritical water oxidation (SCWO) is a key technology for hazardous waste destruction.
- Understanding oxidation rates is crucial for designing effective SCWO systems.
- Isopropyl amine (OPA) is a representative high-risk waste from munitions demilitarization.
Purpose of the Study:
- To investigate the oxidation rate of isopropyl amine (OPA) under supercritical water oxidation (SCWO) conditions.
- To develop a global power-law rate expression for OPA oxidation.
- To provide essential kinetic data for SCWO process design.
Main Methods:
- Experiments were conducted in an isothermal tubular reactor at 25 MPa.
- Reaction temperatures ranged from 684 to 891 K with residence times of 9–18 s.
- OPA conversion was measured by analyzing total organic carbon (TOC) in effluent samples, using H2O2 as the oxidant.
Main Results:
- OPA conversion efficiencies reached 88.94–99.98% across tested initial TOC concentrations (7.21–143.78 mmol/l).
- A global power-law rate expression was regressed from 38 experimental data points.
- Key kinetic parameters include a pre-exponential factor of 2.46(+/-0.65)x10(3)l(1.37)mmol(-0.37)s(-1), activation energy of 64.12+/-1.94 kJ/mol, and reaction orders for OPA (TOC) and oxidant of 1.13+/-0.02 and 0.24+/-0.01, respectively.
Conclusions:
- The study successfully quantified the oxidation kinetics of isopropyl amine under SCWO conditions.
- The derived power-law rate expression provides valuable data for optimizing SCWO processes for munitions waste.
- Accurate kinetic modeling is essential for the efficient and safe design of hazardous waste treatment technologies.