Membrane Bioreactor for Integrated Ammonia Production
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Solution Overview
Problem
The Haber process for ammonia production is energy-intensive and contributes significantly to greenhouse gas emissions due to its reliance on high temperatures and pressures, and the industrial production of nitrogenous compounds has a substantial carbon footprint.
Innovation Solution
A system that splits water into hydrogen and oxygen using clean energy sources, such as electrolysis, to produce ammonia on demand, which is then fed into bioreactors, reducing the carbon footprint by utilizing oxygen-rich streams as a by-product and optimizing the Haber process conditions for bioreactor efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the Haber process is used for ammonia production, then nitrogen is supplied to bioreactors, but energy consumption increases and greenhouse gas emissions are generated
Solution Approach 1:
The patent changes the operating parameters of the Haber process by using a membrane reactor that operates at lower pressures and temperatures compared to conventional Haber processes. The membrane selectively permeates hydrogen, allowing the reaction to proceed under milder conditions while maintaining ammonia production efficiency, thus reducing energy consumption
Solution Approach 2:
The patent replaces the conventional high-pressure mechanical compression system with a membrane-based separation system. Instead of using mechanical compressors to maintain high pressure, the system uses a selective membrane that allows hydrogen to permeate through it, creating the necessary pressure differential without mechanical compression, thereby reducing energy consumption
2Quantity of substance
If the Haber process is used for ammonia production, then nitrogen is supplied to bioreactors, but greenhouse gas emissions increase
Solution Approach 1:
The patent converts the harmful greenhouse gas emissions into a benefit by integrating carbon capture functionality into the membrane reactor system. The membrane selectively separates and concentrates CO2, which can then be captured and utilized or sequestered, transforming the harmful emission into a valuable byproduct or resource
Solution Approach 2:
The membrane reactor performs multiple functions simultaneously: it produces ammonia, separates hydrogen, and captures carbon dioxide. This multi-functionality allows the system to address both ammonia production and greenhouse gas mitigation in a single integrated process, reducing the overall environmental impact
3Productivity
If high pressure and temperature are used in the Haber process, then ammonia production efficiency is improved, but energy consumption increases
Solution Approach 1:
The patent replaces mechanical compression with membrane-based pressure differential creation. The selective hydrogen permeation through the membrane creates the necessary pressure gradient without requiring high-pressure compressors, maintaining reaction efficiency while reducing the energy input required for compression
Solution Approach 2:
The patent optimizes the reaction conditions by using the membrane to maintain appropriate partial pressures of reactants and products. The membrane selectively removes ammonia and hydrogen, shifting the equilibrium without requiring extreme temperatures and pressures, thus maintaining productivity while reducing energy 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 significantly reduces the carbon footprint of nitrogen and oxygen production for bioreactors, enhancing bioreactor efficiency while minimizing environmental impact by using renewable energy sources and optimizing ammonia production processes.
Implementation Method 1
a) the membrane is capable of selective permeability to hydrogen
Implementation Method 2
b) a catalyst is present in the reactor
Implementation Method 3
A system that splits water into hydrogen and oxygen using clean energy sources, such as electrolysis
Data Source
AI summary
Nitrogen in a form suitable for feeding a population of microbes in a bioreactor is produced by reacting nitrogen gas and hydrogen gas to form ammonia plus an unreacted gas stream under conditions favorable to having little unreacted nitrogen gas in the unreacted gas stream. The ammonia, or a compound derived from the ammonia is fed to the microbes and the unreacted gas stream is optionally fed back into the reaction, or fed into the bioreactor. Oxygen can be produced, such as by electrolysis, and also provided to the microbes. Hydrogen from the electrolysis can be added to the hydrogen being reacted with nitrogen gas, and/or can be added to the bioreactor. Where nitrogen gas is produced from air separation, the residual gases can be another source of oxygen.