Surrogate Electrolyzer for CO2-Neutral Hydrogen via Propylene Cycle
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current ammonia and methanol production processes face challenges such as high reliance on electrical input, CO2 emissions, and water usage, particularly when using dynamic and unreliable renewable electricity sources, and are limited by thermodynamic constraints in the hydrogenation step.
Innovation Solution
A novel process utilizing ceramic membrane reactors and surrogate electrolyzers that decouples oxygen evolution and hydrogen evolution reactions, allowing for the production of CO2-neutral hydrogen, ammonia, methanol, and related compounds, using a propylene, IPA, acetone cycle, and facilitating the hydrogenation of formamide to methanol and ammonia, which can operate at reduced temperatures and pressures, optimizing conditions for efficient energy use and product yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If water electrolysis is used to produce hydrogen for ammonia production, then hydrogen can be produced with CO2-neutral or negative emissions, but the process becomes highly dependent on dynamic and unreliable renewable electricity resources
Solution Approach 1:
The patent introduces a surrogate electrolyzer system using propylene, IPA, and acetone as intermediary substances to mediate between electrical energy input and hydrogen production. This intermediary cycle allows the system to buffer the effects of dynamic electrical input while maintaining CO2-neutral operation, resolving the contradiction between clean energy production and reliability.
Solution Approach 2:
The patent implements a dynamic surrogate electrolyzer system that can adapt to varying electrical input conditions through the propylene-IPA-acetone cycle. The system's dynamic nature allows it to handle intermittent renewable electricity while maintaining continuous hydrogen production, thereby improving reliability without compromising CO2 neutrality.
2Productivity
If traditional reforming processes are used to produce hydrogen, then high hydrogen production efficiency can be achieved, but CO2 emissions and high electrical input requirements increase
Solution Approach 1:
The patent changes the fundamental parameters of the electrolysis process by using organic surrogates (propylene, IPA, acetone) instead of water. This parameter change enables the system to achieve high hydrogen production efficiency comparable to traditional reforming while eliminating CO2 emissions and reducing electrical input requirements through the unique chemical cycle mechanism.
3Productivity
If methanol is produced from natural gas or CO/CO2 through hydrogenation, then methanol production is achieved, but the process is limited by hydrogenation step thermodynamics
Solution Approach 1:
The patent uses formamide as an intermediary substance in the methanol production pathway. Instead of directly hydrogenating CO or CO2 (which is thermodynamically limited), the system first converts these to formamide, then hydrogenates formamide to methanol. This intermediary step bypasses the thermodynamic limitations of direct hydrogenation while maintaining efficient methanol production.
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 process reduces electrical input requirements, eliminates CO2 emissions, and minimizes water usage, enabling continuous production of hydrogen and methanol even with intermittent renewable electricity, while achieving high conversion rates and product yields, thus providing a sustainable and economically viable alternative to traditional methods.
Implementation Method 1
a ceramic proton-conducting membrane reactor in which the anode reacts ammonia and methane, protons transverse the ceramic membrane
Implementation Method 2
Surrogate electrolyzers use a working fluid to accomplish OER and HER. The requirement of the working fluid is that it can be hydrated (add water), then dehydrogenated (release H2), then deoxygenated (remove 0.5 O2)
Implementation Method 3
The requirement of the working fluid is that it can be hydrated (add water), then dehydrogenated (release H2), then deoxygenated (remove 0.5 O2)
Implementation Method 4
low temperature hydration of HCN
Data Source
AI summary
The equipment, methods, and materials of electrochemical processes undergoing a series of hydration, dehydrogenation and OER processes are used to produce electrochemical hydrogen and a second product, or ammonia and methanol, or methanol alone, or methanol and urea, or formamide and D.I. water. The processes allow for flexibility of products to insure good profitability into the future of unknown pricing premiums for H2, NH3, CH3OH, H2NCH═O or (NH2)2C═O. All the processes herein, including the production of ammonia and urea, do not cause net nitrification of soil and water and are CO2-free.