Bidirectional Flow Control for Solid Phase Synthesis
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Solution Overview
Problem
Current automated solid phase synthesis systems face inefficiencies due to unidirectional flow designs, leading to wasted reactants and challenges in achieving consistent reaction completion across multiple synthesis vessels, as reactants that could participate in reactions are lost once they flow past the synthesis media, and varying flow rates between vessels complicate achieving uniform reaction outcomes.
Innovation Solution
Implementing a bidirectional flow system that reverses the flow of reactants through synthesis reaction vessels, allowing unreacted reactants to be recycled and maintaining contact with the synthesis medium, which includes sealing and pressurizing vessel inlets and outlets to control fluid flow direction and pressure differentials, enabling reproducible and efficient reagent use across multiple vessels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If unidirectional flow design is used, then system simplicity is maintained, but reactant waste increases and reagent efficiency decreases
Solution Approach 1:
The patent implements bidirectional flow by reversing the flow direction of reagents through the synthesis medium. After reagents flow downward through the synthesis medium, the system reverses the flow to push the same reagents back upward through the synthesis medium, allowing unreacted reactants to be recycled and contacted with the synthesis medium again, thereby reducing reactant waste.
Solution Approach 2:
The bidirectional flow system ensures continuous contact between reagents and synthesis medium by repeatedly cycling the reagents through the synthesis medium in alternating directions. This continuous recycling action maximizes the utilization of reactants and maintains high reagent efficiency throughout the synthesis process.
2Ease of operation
If unidirectional flow is used, then flow control simplicity is maintained, but reaction completion consistency across parallel vessels deteriorates
Solution Approach 1:
By implementing bidirectional flow, the system equalizes the effective residence time and reaction exposure for all parallel vessels. The reverse flow mechanism ensures that reagents are distributed more uniformly across the synthesis medium in each vessel, compensating for variations in vessel geometry and packing, thereby achieving consistent reaction completion across parallel vessels.
3Reliability
If larger volumes of reagents are delivered to compensate for flow rate differences, then reaction completion is improved, but reagent consumption increases
Solution Approach 1:
The bidirectional flow system recovers unreacted reactants by pushing them back through the synthesis medium in the reverse flow direction. This recovery mechanism allows these reactants to be reused in subsequent cycles, significantly reducing the need to deliver larger initial volumes of reagents to ensure reaction completion, thereby lowering overall reagent consumption.
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 enhances reagent efficiency by maintaining reactant contact with synthesis sites, reduces waste, and ensures consistent reaction completion across parallel synthesis vessels, improving the quality and yield of oligomers by optimizing the duration and direction of reagent flow.
Implementation Method 1
The bidirectional flow apparatus moves synthesis reagents through reaction vessels in two directions whereby reagents containing unreacted reactants that have flowed through synthesis reaction vessels past the synthesis media are reversed in flow
Data Source
AI summary
Flow control mechanisms control the direction and flow rate of synthesis reagent through one or more synthesis reaction vessels for automated solid phase synthesis. Selectable, known, and reproducible positive or negative pressure differentials (−5 to +10 psi) accomplish controlled, bidirectional (forward and reverse) flow of synthesis reagents through synthesis media contained within the reaction vessels. Venturi-based vacuum apparatus, valves, electronic pressure regulators and compound digital pressure gauge, can be added to automated solid phase synthesis instruments to provide, control, and monitor known, selectable, reproducible negative and positive pressures to one or both valve sealable and un-sealable ends (inlets and outlets) of the reaction vessel as needed to generate and reverse said pressure differentials between the opposite ends of said synthesis reaction vessels, yielding controlled forward and backward flows of synthesis reagents through the synthesis media.