Refractive Index Phase Detection for CO2 Chromatography
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Solution Overview
Problem
Existing phase detection systems are not suitable for online monitoring of carbon dioxide-based chromatography systems, as they are fragile and not sensitive enough to detect frequent phase changes, leading to operational errors and undesirable outcomes such as irreproducibility and peak distortion.
Innovation Solution
A phase detection system using a conduit with an optical radiation source and photo detector, housed in a robust setup that measures the refractive index of the fluid to determine its phase, capable of withstanding high pressures and temperatures, and integrated into the chromatography system to prevent rotation and fluid flow disruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing phase detection systems are used for online monitoring, then the system structure is simple, but the detection sensitivity and reliability are insufficient
Solution Approach 1:
The patent replaces mechanical or simple optical sensors with a refractive index-based detection system that uses optical radiation sources and detectors to measure phase changes. This substitution enables more sensitive and reliable phase detection through optical measurement of refractive index variations, while the system remains integrated into the existing chromatography flow path.
Solution Approach 2:
The detection system serves multiple functions: it monitors phase changes, measures refractive index, and provides continuous online detection throughout the chromatography process. The same optical system can detect different phases (supercritical, liquid, gas) by measuring refractive index variations, making it a universal phase detection solution.
2Strength
If a robust housing with apertures is used to protect the optical system, then the system can withstand high pressure and temperature, but the optical radiation transmission may be affected
Solution Approach 1:
The patent uses a housing with specifically designed apertures that allow optical radiation to pass through while maintaining structural integrity for high pressure and temperature resistance. The apertures are positioned and sized to provide mechanical strength where needed while allowing sufficient light transmission for detection.
Solution Approach 2:
The housing acts as an intermediary structure that mediates between the requirements for mechanical strength and optical transmission. The apertures in the housing serve as intermediaries that allow optical radiation to pass through the pressure-resistant barrier to reach the detectors.
3Productivity
If the optical system is integrated into the fluid flow path, then continuous monitoring is enabled, but the system becomes sensitive to fluid flow disruption and rotation
Solution Approach 1:
The patent merges the optical detection system with the fluid flow path by positioning the optical radiation source and detectors within or adjacent to the conduit. This integration enables continuous monitoring of the mobile phase as it flows through the system, allowing real-time phase detection without interrupting the chromatography process.
Solution Approach 2:
The housing design incorporates asymmetric features such as positioning the apertures and optical components in specific orientations that reduce sensitivity to rotation and flow disruption. The asymmetric arrangement ensures that the optical path remains stable even when the system experiences minor movements or rotational forces during operation.
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 continuous, reliable monitoring of the phase of carbon dioxide in chromatography systems, allowing for timely identification and correction of phase changes, reducing operational errors and maintaining the desired state of the mobile phase.
Implementation Method 1
The circuit measures the refractive index of a fluid in the fluid flow path
Data Source
AI summary
The present disclosure relates to phase detection in multi-phase fluids where two fluid phases can be present in the fluid. Phase detection apparatus and methods are disclosed for determining the phase(s) (e.g., supercritical, liquid, and/or gas) of a fluid in a multi-phase fluid system, such as carbon dioxide based separation and chromatography system.