Flow Hydrogenation Apparatus with In-Situ Electrolytic Hydrogen Generation
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Solution Overview
Problem
Existing flow-type laboratory scale hydrogenation apparatuses operating under supercritical conditions are complex, costly, and prone to producing undesired by-products, making them unsuitable for rapid and automated library synthesis in combinatorial chemistry, where minimal human intervention and fast replacement of inert fluids and catalysts are required.
Innovation Solution
A flow-type laboratory scale hydrogenation apparatus that operates under normal conditions by providing a constant volume flow of a base solution, using a detachable hydrogenation reactor with increased flow resistance and an electrically controlled pressure-adjusting unit to maintain pressures below supercritical values, and generates hydrogen in-situ using an asymmetric pressure electrolytic cell, allowing for precise control of the hydrogenation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If supercritical conditions are used for hydrogenation, then hydrogen delivery efficiency is improved, but device complexity and operational cost increase
Solution Approach 1:
The patent changes the physical state parameters of the reaction system by operating under normal pressure and temperature conditions instead of supercritical conditions. This is achieved through the pressure-adjusting unit that maintains pressure below supercritical values, thereby simplifying the apparatus while maintaining effective hydrogen delivery through alternative mechanisms such as in-situ hydrogen generation and controlled flow conditions.
2Productivity
If supercritical conditions are used for hydrogenation, then hydrogen delivery efficiency is improved, but operational cost increases
Solution Approach 1:
The patent employs inexpensive, easily replaceable components such as the asymmetric pressure electrolytic cell for hydrogen generation and the replaceable reactor cartridge with catalyst packing. These components can be easily replaced when depleted or contaminated, avoiding the high operational costs associated with maintaining supercritical conditions and specialized equipment.
3Productivity
If supercritical conditions are used for hydrogenation, then reaction efficiency is improved, but by-product formation increases
Solution Approach 1:
The patent replaces the mechanical/thermal system of supercritical fluid delivery with an electrochemical system for hydrogen generation. The asymmetric pressure electrolytic cell generates hydrogen on-demand through electrolysis, providing controlled hydrogen supply that reacts more selectively with substrates, thereby reducing unwanted by-products while maintaining reaction efficiency.
4Productivity
If automated synthesis is implemented for combinatorial chemistry, then productivity is improved, but device complexity increases
Solution Approach 1:
The patent divides the automated synthesis system into modular, independent components: a replaceable reactor cartridge containing catalyst packing, an external pressure-adjusting unit, and an in-situ hydrogen generation system. This segmentation allows each component to be optimized and replaced independently, simplifying the overall automated system while maintaining high productivity for combinatorial chemistry applications.
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 efficient and automated hydrogenation of samples under normal conditions without forming undesired by-products, facilitating rapid production of multiple molecules with high purity and yield, while reducing the complexity and cost associated with supercritical operations.
Implementation Method 1
generates hydrogen in-situ using an asymmetric pressure electrolytic cell
Implementation Method 2
using a detachable hydrogenation reactor with increased flow resistance
Data Source
AI summary
A laboratory scale continuous flow hydrogenation apparatus (100) includes a reservoir (104), a feed pump (102), a mixing element (108) with two inlets and an outlet, a hydrogenation reactor (110) and a pressure-adjusting unit (112), all connected into a flow path. A hydrogen source (126) and a one-way valve (120) are arranged between the hydrogen source (126) and the second inlet of the mixing element (108). The feed pump (102) can provide a constant volume rate. The reservoir (104) contains at least a solvent base solution of the sample to be hydrogenated. The hydrogenation reactor (110) connects into the flow path by detachable connections and is formed as a replaceable cartridge containing a packing which increases the flow resistance and facilitates mixing. The pressure-adjusting unit (112) connects into the flow path after the hydrogenation reactor (110) and is provided with a regulation controlled electrically.