Plasma CO2 Conversion With Membrane Separation for Safe CO Output
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Solution Overview
Problem
Existing CO2 conversion processes to CO face inefficiencies due to complex gas separation requirements, high energy costs, and dangerous flammable mixtures of CO and oxygen, limiting conversion rates and increasing production costs.
Innovation Solution
A system utilizing a plasma reactor with controlled molar ratios of CO2 and reducing agents like methane or hydrogen, combined with a gas separation membrane, to optimize CO production by maintaining stoichiometric ratios and reducing oxygen concentration, achieving efficient and safe CO generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If direct CO2 dissociation by plasma is used, then CO production is achieved, but explosive and flammable CO-O2 mixtures are generated requiring complex separation systems
Solution Approach 1:
A water-soluble gas separation membrane is introduced as an intermediary component between the plasma reactor and the CO product stream. This membrane selectively separates CO from O2 and CO2 based on differential gas permeability, enabling safe CO extraction without requiring complex multi-stage separation systems. The membrane acts as a mediator that resolves the contradiction by providing simple, effective gas separation.
Solution Approach 2:
The invention changes the operational parameters of the plasma reactor by controlling CO2 conversion rate to remain below 65%. This parameter control prevents excessive O2 generation that would create dangerous flammable mixtures. By adjusting this critical parameter, the system achieves safe CO production with simplified separation requirements.
2Productivity
If high CO2 conversion rate is used, then CO production increases, but residual oxygen increases causing back reaction and energy cost increase
Solution Approach 1:
The invention establishes an optimal parameter range for CO2 conversion rate (below 65%) that balances CO production efficiency with energy consumption. By controlling this parameter, the system prevents excessive O2 generation that would cause back reactions and energy waste, while still achieving sufficient CO production for economic viability.
Solution Approach 2:
The system incorporates feedback control mechanisms to monitor and adjust CO2 conversion rate in real-time. This ensures the conversion rate remains within the optimal range below 65%, preventing energy waste from back reactions while maintaining efficient CO production.
3Manufacturing precision
If complex gas separation stages are implemented, then product purity is improved, but energy consumption and process complexity increase
Solution Approach 1:
The water-soluble gas separation membrane serves as an intermediary that achieves effective CO-O2-CO2 separation in a single stage, eliminating the need for multiple complex separation stages. This membrane-based approach provides sufficient product purity while dramatically reducing energy consumption compared to traditional multi-stage systems.
Solution Approach 2:
The invention extracts the essential separation function from complex multi-stage systems and concentrates it into a single membrane separation unit. This extraction approach maintains product purity requirements while minimizing energy consumption by removing unnecessary separation stages.
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 achieves high-purity CO production with reduced energy costs by limiting conversion rates to below 65%, ensuring complete reducing agent utilization and minimizing residual oxygen, thereby enhancing process efficiency and safety.
Implementation Method 1
there are several known processes of conversion of CO2 to CO which use plasma for stimulation of reaction
Implementation Method 2
CO2 dissociation by plasma is also known, as shown by the reaction: CO2═CO+1⁄2 O2
Implementation Method 3
a gas separation membrane (GSM) in fluid connection with an outlet of the water separator comprising a CO outlet and a CO2 outlet
Data Source
AI summary
There is provided a system and method for plasma discharge induced reduction of CO2 to CO in the presence of a predetermined amount of a reducing agent (i.e. methane or hydrogen).