2D Chromatography Modulation Valve for Loss-Free Sample Transfer
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Solution Overview
Problem
Existing two-dimensional chromatographic sample separation methods face inefficiencies in fluid processing, particularly in the transfer and modulation between separation units, leading to incomplete or loss of sample fluid during transitions.
Innovation Solution
A fluid processing apparatus with a modulation unit that selectively withdraws and injects fluid between first and second processing units, allowing for buffering, dilution, and controlled fluid transfer, using a modulation valve and drive to manage fluid flow and pressure, ensuring complete and efficient transfer of sample fluid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If direct fluid coupling between first-dimension outlet and second-dimension inlet is used, then fluid transfer is simplified, but sample fluid loss occurs during transitions
Solution Approach 1:
A modulation unit is introduced as an intermediary component between the first-dimension outlet and second-dimension inlet. This modulation unit includes a modulation valve that can be switched between a first position (connecting first-dimension outlet to second-dimension inlet) and a second position (disconnecting the fluid path). The intermediary modulation unit enables complete and loss-free transfer of sample fluid by controlling the timing and manner of fluid transfer, while still maintaining relative simplicity of the overall system.
2Reliability
If modulation unit with buffering is used, then sample transfer completeness is improved, but device complexity increases
Solution Approach 1:
The modulation unit is designed to perform multiple functions: it acts as a switching valve, a buffering chamber, and a transfer mechanism. By combining these functions into a single integrated unit, the patent achieves complete and reliable sample transfer without proportionally increasing system complexity. The buffering capability ensures that all sample fluid is transferred completely, while the multi-functionality keeps the device structure compact and manageable.
3Manufacturing precision
If selective withdraw and transfer operation is implemented, then sample integrity is maintained, but operation complexity increases
Solution Approach 1:
The modulation valve operates periodically, switching between the first position (for withdrawing and transferring sample fluid) and the second position (for resetting and preparing for next transfer). This periodic switching enables selective withdraw and transfer operations that maintain sample integrity by controlling exactly when fluid paths are connected or disconnected. The automated periodic operation reduces manual intervention complexity while preserving sample integrity through precise timing control.
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 precise and reliable two-dimensional fluid separation by ensuring complete transfer of sample fluid between dimensions, maintaining sample integrity and reducing losses, thereby enhancing the accuracy and efficiency of chromatographic analysis.
Implementation Method 1
A fluid processing apparatus with a modulation unit that selectively withdraws and injects fluid between first and second processing units, allowing for buffering, dilution, and controlled fluid transfer, using a modulation valve and drive to manage fluid flow and pressure
Implementation Method 2
A fluid unit is fluidically coupled to the first fluid processing unit and comprises a first buffering unit configured for buffering fluid
Data Source
Figure 1~2A
Figure 2B~2C
Figure 3
AI summary
An apparatus for fluid processing (200) comprises a first fluid processing unit (204) and a second fluid processing unit (208). A fluid unit is fluidically coupled to the first fluid processing unit and comprises at least one of: a first buffering unit (240) for buffering a fluid, and a flow source (250) for providing a solvent or a solvent mixture or a flow thereof. At a first coupling point (220) said fluid unit is fluidically coupled to the first fluid processing unit (204). A modulation unit (210) selectively withdraws fluid from the first coupling point (220), and transfers withdrawn fluid into the second fluid processing unit (208). In a preferred embodiment the first processing unit (204) is a first-dimension separation apparatus comprising a first chromatographic column (30) and the second processing unit (208) is a second-dimension separation apparatus comprising a second chromatographic column (30').