Flow Reactor for On-Demand High-Pressure Hydrogen Generation
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Solution Overview
Problem
Current methods for on-demand hydrogen generation, such as electrolysis and steam-methane reforming, face challenges in commercial scalability and economics, particularly for large-scale hydrogen production from hydrogen-rich liquid carriers.
Innovation Solution
A flow reactor system that uses a homogeneous/heterogeneous catalyst blend to dehydrogenate high-pressure liquid organic hydrogen carriers like formic acid, with a purification system to produce high-pressure, pure H2 gas, capable of operating at pressures from 50 psig to 10500 psig and achieving less than 5 ppm CO2, less than 10 ppm moisture, and less than 5 ppm CO impurities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electrolysis or steam-methane reforming is used for hydrogen production, then hydrogen can be generated, but commercial scalability and economics are challenged
Solution Approach 1:
The invention changes the chemical parameters by using formic acid decomposition instead of water electrolysis or steam-methane reforming. This alternative chemical pathway enables hydrogen production at lower temperatures and pressures, improving commercial scalability and economics while maintaining high productivity
Solution Approach 2:
The invention utilizes phase transitions in the purification system, particularly condensation of water and CO2 from the gaseous reaction products. The condenser efficiently separates these byproducts through phase change, enabling continuous hydrogen production without complex separation equipment
2Manufacturing precision
If a flow reactor system with purification stages is used, then pure hydrogen gas is produced, but system complexity increases
Solution Approach 1:
The invention employs phase transition of water and CO2 from gas to liquid in the condenser, enabling automatic separation and removal of these byproducts. This simple phase-based separation achieves high hydrogen purity without requiring complex membrane or adsorption systems
Solution Approach 2:
The invention extracts and removes byproducts (water and CO2) from the reaction stream through condensation. By taking out these impurities in a simple condensation step, high purity hydrogen is obtained without complex multi-stage purification equipment
3Productivity
If continuous stirred-tank reactor with homogeneous/heterogeneous catalyst blend is used, then complete dehydrogenation is achieved, but reactor design complexity increases
Solution Approach 1:
The invention merges homogeneous and heterogeneous catalysts into a single blended catalyst system. This combination leverages the high activity of homogeneous catalysts and the ease of separation of heterogeneous catalysts, achieving complete dehydrogenation in a single reactor without requiring separate reaction and separation steps
Solution Approach 2:
The catalyst blend performs multiple functions simultaneously: formic acid activation, hydrogen generation, and CO2 production. This multi-functional catalyst system enables complete dehydrogenation in one reactor, simplifying the overall process design while maintaining high productivity
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
The system enables continuous, efficient production of high-pressure, pure hydrogen gas, addressing the scalability and economic challenges of existing methods by providing a reliable and on-demand hydrogen supply for applications such as fuel cells and hydrotreating.
Implementation Method 1
using a homogeneous/heterogeneous catalyst blend to dehydrogenate the feed completely to H2 and CO2 selectively
Implementation Method 2
a reflux condenser forces the liquid organic hydrogen carrier and water impurities to stay within the reactor, allowing only H2 and CO2 to pass
Implementation Method 3
first by CO2 condensation
Implementation Method 4
second by CO2 extraction by cold, high-pressure water
Implementation Method 5
optionally third by a CO2 sorbent that purifies the stream to less than 5 ppm CO2
Data Source
AI summary
A flow reactor system for providing on-demand H2 evolution at pressure from a liquid organic hydrogen carrier and/or blends thereof includes a reactor that includes a reaction vessel having an inlet and outlet. The inlet is configured to introduce reactants into the reaction vessel, and the outlet is configured to release reaction products. The reaction vessel is configured to hold therein a catalyst system capable of catalyzing the evolution of molecular hydrogen from a liquid organic hydrogen carrier. Advantageously, the reaction vessel is configured to operate at pressures greater than or equal to 50 psig (e.g., from about 50 psig to about 10500 psig. The flow reactor system also includes a source of preheated liquid organic hydrogen carrier in fluid communication with the reactor and a purification system in fluid communication with the outlet that provides purified molecular hydrogen gas for on-demand applications.