Extraction Module with Bilayer Filtering for Liquid Pretreatment
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Solution Overview
Problem
Current liquid sample pretreatment methods are cumbersome, requiring multiple specialized appliances and excessive organic solvents, leading to inaccurate test results and environmental concerns due to contamination and waste production.
Innovation Solution
An extraction structure and module with a bilayer filtering system, including a first filter disc with an expansive agent that blocks water and an extractant layer for simultaneous liquid-liquid partition and solid phase extraction, integrated with a porous filter disc for filtration, allowing organic solvents to pass while preventing aqueous solutions, and a sealing structure for efficient operation in one step.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional stepwise pretreatment methods are used, then each step can be performed with specialized appliances, but the process becomes tedious and requires multiple specialized appliances
Solution Approach 1:
The patent combines liquid-liquid partition extraction, solid phase extraction purification, and sample filtration into a single integrated extraction structure. The structure includes an extraction cavity with a porous filter disc at the bottom, allowing all three operations to be performed simultaneously in one apparatus, eliminating the need for multiple separate specialized appliances.
Solution Approach 2:
The extraction structure serves multiple functions simultaneously: it performs liquid-liquid partition extraction through the extraction cavity, solid phase extraction purification through the porous filter disc, and sample filtration through the same filter disc. This multi-functional design allows one apparatus to replace several specialized devices.
2Reliability
If multiple separate pretreatment steps are performed, then each step can be optimized independently, but solvent consumption increases and contamination risk increases
Solution Approach 1:
By merging liquid-liquid partition extraction and solid phase extraction purification into a single simultaneous operation within the same extraction cavity, the patent reduces the total volume of organic solvent required. The porous filter disc enables both extraction mechanisms to operate together, eliminating redundant solvent usage that would occur in sequential steps.
Solution Approach 2:
The porous filter disc acts as an intermediary element that enables both liquid-liquid partition extraction and solid phase extraction purification to occur simultaneously. It facilitates the separation process while preventing direct contact between the organic solvent and aqueous layer, reducing solvent contamination and loss.
3Ease of operation
If traditional filtration methods are used, then sample filtration can be performed, but the process requires separate appliances and increases operation time
Solution Approach 1:
The patent integrates sample filtration into the extraction cavity structure itself, with the porous filter disc serving as both the filtration element and part of the extraction system. This allows filtration to be performed simultaneously with extraction operations, eliminating the need for separate filtration appliances and reducing total operation time.
Solution Approach 2:
The porous filter disc performs multiple functions: it enables solid phase extraction purification, facilitates sample filtration, and maintains structural integrity within the extraction cavity. This multi-functional component eliminates the need for separate filtration devices and reduces overall pretreatment time.
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
Simplifies the pretreatment process by completing liquid-liquid partition, solid phase extraction, and filtration in one step with reduced solvent consumption and improved accuracy, minimizing contamination and waste.
Implementation Method 1
the expansive agent in said filter disc expands rapidly, thereby blocking gaps in the filter disc, so that the aqueous solution cannot pass
Implementation Method 2
a purification step is most commonly used at present. The current solid phase extraction step comprises filling a tube in the form of an injector with a solid phase extractant, and using a vacuum pump from below for forming a vacuum state such that the liquid carries the sample to pass through the solid phase extractant
Implementation Method 3
a porous filter disc for filtration, allowing organic solvents to pass while preventing aqueous solutions
Implementation Method 4
liquid-liquid partition extraction requires a special glass bottle for liquid-liquid partition, so as to oscillate water and a solvent immiscible with water, and make the same stand and layered
Data Source
AI summary
Provided are an extraction structure, an extraction module, and a liquid pretreatment device relating to the liquid component testing technical field. The extraction structure comprises a cavity and a first pore passage. The extraction module comprises an extraction module body, successively bottom up, including a first cavity provided therein with a second filter layer, a first pore passage provided therein with a first filter layer, and a second cavity provided therein with an extractant layer and a porous filter disc; the first and second filter layers contain therein an expansive agent; and the diameter of the first filter layer is smaller than that of the second filter disc. The liquid pretreatment device comprises a storage tank, a transfer device and the extraction module. Between the transfer device and the extraction module is provided a filter membrane for filtering and supporting.