Two Valve Switching Modulator for Comprehensive 2D Gas Chromatography
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Solution Overview
Problem
Conventional two-dimensional gas chromatography systems require coolants like liquid nitrogen or liquid carbon dioxide for thermal modulation, making them inconvenient, especially in remote or industrial settings, due to coolant handling difficulties.
Innovation Solution
A valve switching modulation system utilizing two four-port valves that switch simultaneously to achieve modulation, eliminating the need for coolants and allowing independent control of the first and second dimensional column flows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermal modulation with liquid nitrogen or liquid carbon dioxide is used, then modulation function is achieved, but coolant handling becomes difficult and inconvenient
Solution Approach 1:
The patent extracts and eliminates the coolant system (liquid nitrogen or liquid carbon dioxide) from the thermal modulation approach and replaces it with a valve switching mechanism. This removes the harmful factor (coolant handling difficulty) while preserving the essential modulation function through alternative means (valve switching to control flow paths).
Solution Approach 2:
The patent replaces the thermal modulation system (relying on cryogenic coolants and thermal trapping) with a mechanical valve switching system. The valve switching mechanism uses controlled opening and closing of valves to achieve modulation, substituting the complex thermal management system with a simpler mechanical control approach that eliminates coolant handling requirements.
2Measurement precision
If thermal modulation system is used, then separation is achieved, but device complexity increases due to coolant system requirements
Solution Approach 1:
The patent removes the complex coolant system (liquid nitrogen or liquid carbon dioxide handling, thermal trapping circuits) from the device and replaces it with a valve switching mechanism. This extraction eliminates the source of device complexity while maintaining the chromatographic separation function through flow path control.
Solution Approach 2:
The patent substitutes the complex thermal modulation system with a simpler valve switching mechanism. The valve system provides the necessary modulation and separation control without requiring cryogenic cooling infrastructure, thermal traps, or complex temperature control systems, thereby reducing overall device complexity.
3Productivity
If conventional modulation system is used, then first dimensional column flow is controlled, but second dimensional column flow control is limited
Solution Approach 1:
The patent segments the flow control into independent pathways using multiple valves. By dividing the modulation system into separate valve-controlled paths for the first and second dimensional columns, it enables independent flow control for each dimension. This segmentation allows the second dimensional column flow to be independently adjusted without affecting the first dimensional column operation.
Solution Approach 2:
The patent introduces dynamic valve switching capability that allows real-time adjustment of flow paths for both dimensional columns. The valve switching mechanism enables dynamic control of the second dimensional column flow independently, providing adaptability and versatility in optimizing separation parameters for different analytical requirements.
Data Source
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AI summary
The present invention is an improvement to two-dimensional comprehensive gas chromatography. The improvement is a two-valve switching modulator connecting two different type of separation columns. The advantages of current invention are (1) a simple system can be built by readily available parts; (2) no specific materials required (other than electricity) to operate the system, especially, do not need any type of coolant; (3) can be build on any GC as an externally added on unit; (4) The first and the second dimensional column flow are independently controlled, it is easier to design the experiment; and (5) it is cost effective, the cost of building this system is inexpensive than other type of modulation.