In-Line Surfactant Concentration Control Using COD and TOC
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Solution Overview
Problem
Existing industrial processes face challenges in accurately and rapidly determining surfactant concentrations in aqueous solutions, leading to inefficiencies and waste due to delayed testing and over-dosing of expensive surfactants.
Innovation Solution
A method and system that measures carbon-related parameters such as COD or TOC to indirectly determine surfactant concentrations, allowing for rapid and in-line adjustments to maintain concentrations within preset limits, using a controller to manage surfactant flow rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If off-line chemical analysis methods are used to measure surfactant levels, then measurement precision can be achieved, but the testing time is excessively long (several hours or days)
Solution Approach 1:
The patent replaces traditional off-line chemical analysis methods with an on-line optical measurement system using a spectrophotometer. This substitution enables continuous real-time monitoring of surfactant concentrations through light absorption measurements at specific wavelengths (210 nm and 280 nm), eliminating the time-consuming nature of conventional chemical analysis while maintaining measurement accuracy through calibration curves.
Solution Approach 2:
The patent introduces calibration curves as an intermediary tool that correlates optical density measurements (OD210 and OD280) with actual surfactant concentrations. These calibration curves, established through preliminary experiments with known surfactant concentrations, enable the conversion of optical measurements into accurate concentration values, bridging the gap between rapid optical measurement and precise concentration determination.
2Device complexity
If traditional testing regimes are used, then equipment complexity is low, but surfactant over-dosing and waste occur due to inability to make rapid adjustments
Solution Approach 1:
The patent implements a feedback control system where real-time surfactant concentration measurements are continuously monitored and fed back to the process control system. This enables dynamic adjustment of surfactant dosing rates to maintain concentrations within optimal ranges, preventing both over-dosing and under-dosing. The system automatically adjusts dosing based on measured concentrations, ensuring efficient surfactant utilization and eliminating waste associated with traditional fixed-dosing regimes.
Solution Approach 2:
The patent establishes continuous on-line monitoring of surfactant concentrations throughout the industrial process, replacing discontinuous off-line testing. This continuous measurement approach ensures that surfactant levels are constantly tracked and adjusted, maintaining optimal concentrations at all times and preventing the surfactant over-dosing that occurs with periodic traditional testing methods.
3Productivity
If rapid in-line measurement is implemented, then productivity is improved through quick adjustments, but measurement precision may be compromised
Solution Approach 1:
The patent replaces slow off-line chemical analysis with rapid on-line spectrophotometric measurement, achieving both speed and accuracy. The optical measurement system provides real-time data without the time delays of traditional methods, enabling immediate process adjustments while maintaining measurement reliability through validated calibration procedures.
Solution Approach 2:
The patent uses calibration curves as an intermediary to ensure measurement precision in the rapid on-line system. These calibration curves, established through rigorous experimentation with known surfactant concentrations, provide a reliable correlation between optical density readings and actual concentrations, ensuring that the speed of on-line measurement does not compromise accuracy.
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
Enables quick and efficient control of surfactant levels in industrial processes, reducing waste and optimizing product quality while ensuring compliance with environmental standards.
Implementation Method 1
A carbon related parameter is then measured from the fluid sample. The carbon related parameter, for example, can be Chemical Oxygen Demand (COD) or Total Organic Carbon (TOC).
Implementation Method 2
A carbon related parameter is then measured from the fluid sample. The carbon related parameter, for example, can be Chemical Oxygen Demand (COD) or Total Organic Carbon (TOC).
Data Source
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AI summary
A method and system are disclosed for determining surfactant concentration levels in aqueous solutions. In accordance with the method of the present disclosure, a related carbon parameter, such as COD or TOC, is measured in an aqueous solution. This measurement is then converted to surfactant concentration using a mathematical correlation or reference data. Through the method and system of the present disclosure, surfactant concentrations in process streams can be monitored and adjusted on the fly.