Resistively Heated Reactor for Rapid TOC Measurement in Salty Samples
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Solution Overview
Problem
Conventional methods for measuring total organic carbon (TOC) in aqueous samples are limited by errors caused by particulates, hardware failures due to high salt concentrations, and slow, non-uniform heating of reactors.
Innovation Solution
The described method and apparatus use supercritical water oxidation in a resistively heated reactor to convert all forms of carbon in aqueous samples to carbon dioxide, allowing for precise measurement of TOC, dissolved solids, and particulates, with faster heating times and improved temperature control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional high-temperature combustion is used to measure TOC, then organic carbon can be converted to CO2 for measurement, but salt deposits in the furnace causing maintenance issues and eventual clogging
Solution Approach 1:
The patent changes the operating parameters by using pressurized oxidation at lower temperatures (up to 200°C) instead of high-temperature combustion (600°C+). This parameter change prevents salt deposition while still achieving complete oxidation of organic carbon to CO2, thereby maintaining measurement accuracy while eliminating furnace clogging issues
Solution Approach 2:
The patent extracts the oxidation process from the high-temperature combustion environment and separates it into a pressurized liquid-phase reaction. By removing the organic carbon oxidation from the high-temperature furnace environment, salt deposition is prevented while oxidation still occurs efficiently under pressurized conditions
2Temperature
If conventional external heating of reactor is used, then the reactor can be heated to required temperature, but heating is slow and non-uniform
Solution Approach 1:
The patent merges the heating function directly into the reactor wall by embedding resistive heating elements within the reactor structure. This integration allows direct heating of the reaction mixture, achieving rapid and uniform temperature distribution throughout the sample, eliminating the slow and non-uniform heating problems of external heaters
Solution Approach 2:
The patent replaces the mechanical thermal conduction system (external heater heating through reactor wall) with an electrical resistive heating system embedded in the reactor. This substitution enables direct energy transfer to the reaction mixture, dramatically reducing heating time and improving temperature uniformity
3Measurement precision
If persulfate oxidation method is used for TOC measurement, then organic carbon can be converted to CO2, but high salt concentrations create high demand for oxidizer addition
Solution Approach 1:
The patent changes the oxidation conditions by applying pressure to maintain water in a liquid state at elevated temperatures (up to 200°C). This parameter change enables direct thermal oxidation of organic carbon with much lower oxidizer demand compared to persulfate methods, especially in high-salt matrices, while still achieving complete conversion to CO2 for accurate measurement
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables accurate and rapid measurement of carbon concentrations, overcoming previous limitations by allowing for shorter throughput times, reduced hardware maintenance, and improved reproducibility.
Implementation Method 1
a resistive heater element within the reactor converts electrical energy to thermal energy
Implementation Method 2
the sample is oxidized in the reactor to a temperature sufficient to convert the organic compounds in the sample to carbon dioxide
Data Source
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AI summary
Apparatus and methods for measuring the concentrations of organic and inorganic carbon, or of other materials, in aqueous samples are described, having a reactor that is resistively heated by passing an electric current through the reactor.