Orthogonal Flow Microreactor with Size-Selective Filters
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Solution Overview
Problem
Current microreactors are not designed for rapid catalyst exchange or handling small amounts of materials, making them unsuitable for exploring new catalysis pathways or combinatorial screening of reaction conditions, especially in research-scale quantities where milligrams or sub-milligrams of compounds are used.
Innovation Solution
A microfluidic device with a microreactor intersecting two channels, fenced by size-selective filters, allows for the efficient delivery and removal of catalysts in the form of beads, enabling rapid, scalable, and multiplexed chemical reaction screening by immobilizing catalysts on beads that cannot pass through the filters, facilitating automated catalyst feed and removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If catalysts are provided as macroscopic solids or embedded into tubes or pellets in conventional microreactors, then heterogeneous catalysis reactions can be performed without separating chemical components, but the catalyst material cannot be quickly exchanged for reaction pathway screening
Solution Approach 1:
The catalyst is segmented into discrete microbeads that can be individually manipulated and exchanged. Each microbead contains a specific catalyst, allowing rapid exchange by simply replacing the bead train in the microreactor channel, thus enabling high-speed reaction pathway screening while maintaining heterogeneous catalysis functionality
Solution Approach 2:
The system transitions from static catalyst embedding to dynamic catalyst exchange. Microbeads are flowed through the microreactor channel and can be exchanged on-demand, allowing the catalyst composition to be dynamically adjusted for different reaction screenings while maintaining continuous flow operation
2Quantity of substance
If conventional microreactors are used for catalytic reactions, then reactions can be performed in a flow-chemistry setting, but they are not designed for handling small amounts of materials at research-scale quantities
Solution Approach 1:
The system changes the scale parameter by using microbeads with catalyst loads in the microgram to milligram range, matching research-scale requirements. The microbead diameter and catalyst loading per bead are optimized to achieve appropriate total catalyst quantities while maintaining flow-chemistry operation and ease of handling
Solution Approach 2:
Microbeads serve as intermediaries that carry catalysts through the microreactor. These beads enable precise control of small catalyst amounts while maintaining ease of operation through simple flow-based delivery and removal, bridging the gap between微量 catalyst requirements and operational simplicity
3Ease of operation
If homogeneous catalysis is performed in wet chemistry environments, then reactions can be conducted with little effort, but labor-intensive techniques are required to separate compounds after the reaction
Solution Approach 1:
The catalyst is extracted from the homogeneous phase and immobilized on microbeads, creating a heterogeneous system. This allows the catalyst to be easily separated from reaction products by simple filtration or flow-based removal of beads, eliminating the need for complex separation techniques while maintaining ease of reaction setup
Solution Approach 2:
The catalyst is localized on the surface or within the microbeads rather than being distributed homogeneously throughout the solution. This localized positioning enables easy separation by removing the beads while keeping the reaction conditions and setup simplicity similar to homogeneous catalysis
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
This approach enables efficient and systematic testing of reaction pathways with minimal experimental effort, allowing for the reuse of small catalyst amounts and compatibility with research-scale quantities, suitable for applications in drug discovery, fertilizer production, and material science.
Implementation Method 1
The first channel is fenced by two size-selective filters, at the intersection. The two size-selective filters include a first filter and a second filter, which are respectively arranged upstream and downstream of the microreactor in the second channel. The beads are fed into the microreactor through the first channel, such that they remain confined between the two size-selective filters.
Implementation Method 2
The beads are functionalized with, or consist of, the first chemical compound of one of the pairs. In embodiments, the first chemical compound includes a catalyst, for each of at least some of the distinct combinations of pairs of chemical compounds. The solution flown along the second channel gives rise to a chemical reaction involving the second chemical compound as a reactant. The chemical reaction is catalyzed by the catalyst upon the second chemical compound interacting with the catalyst in the microreactor.
Data Source
AI summary
According to aspects, the invention is embodied as a method of performing chemical reaction screening steps using a microfluidic device, which includes a microreactor. The latter is defined at an intersection of a first channel and a second channel of the microfluidic device. The first channel is fenced by two size-selective filters, at the intersection. The two size-selective filters include a first filter and a second filter, which are respectively arranged upstream and downstream of the microreactor in the second channel. The method revolves around sequentially performing chemical reaction screening steps according to distinct combinations of pairs of chemical compounds, where each of the pairs involves a first chemical compound and a second chemical compound. Beads are fed into the microreactor and a solution is flown through the microreactor. The beads are fed into the microreactor through the first channel, such that they remain confined between the two size-selective filters.