Auto-Refrigeration CO2 Separation for Pure Hydrogen Production
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Solution Overview
Problem
Current methods for removing carbon dioxide from industrial gas streams are costly and energy-intensive, posing challenges for achieving 100% CO2 recovery and integration with hydrogen production processes, which is essential for reducing atmospheric CO2 emissions and supporting a hydrogen-based economy.
Innovation Solution
The implementation of an auto-refrigeration system for efficient CO2 separation from industrial process streams, combined with hydrogen production methods that utilize partial oxidation and catalytic reactors, enables the production of pure hydrogen with minimal CO2 emissions and the recovery of CO2 for subsequent disposal or reuse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional CO2 removal methods are used, then CO2 can be removed from industrial gas streams, but the process is costly and energy-intensive
Solution Approach 1:
The patent utilizes phase transitions of CO2 (between gas and liquid/solid phases) at low temperatures to achieve separation. By cooling the gas stream to near CO2 freezing point, CO2 condenses or freezes while other gases remain in vapor phase, enabling efficient separation without energy-intensive chemical absorption or membrane processes
Solution Approach 2:
The invention changes the temperature parameter of the gas stream to near CO2 freezing point conditions, fundamentally altering the physical state and separation behavior of CO2. This parameter change enables a simple thermal separation process that avoids costly and energy-intensive conventional removal methods
2Object-generated harmful factors
If 100% CO2 recovery is achieved, then atmospheric CO2 emissions are reduced, but the complexity of the separation system increases
Solution Approach 1:
The patent employs phase transition of CO2 at low temperatures as a simple physical separation mechanism that achieves near 100% recovery without complex chemical processing equipment. The phase change naturally concentrates CO2 while other gases pass through, simplifying the overall system architecture
Solution Approach 2:
The invention extracts CO2 from the industrial gas stream by exploiting its unique phase behavior at low temperatures. CO2 is selectively removed through condensation or freezing, while other components remain gaseous and are easily separated, achieving high recovery with minimal equipment
3Manufacturing precision
If CO2 is separated from hydrogen production streams, then pure hydrogen is produced, but the separation process must handle mixed gas compositions
Solution Approach 1:
The patent uses phase transition of CO2 as a universal separation mechanism that works regardless of the specific composition of the mixed gas stream. As long as CO2 is present and the temperature is lowered sufficiently, CO2 will phase-change while other components (hydrogen, nitrogen, methane, etc.) remain gaseous, providing consistent high-purity hydrogen recovery across varying feed compositions
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 cost of CO2 removal, achieves near 100% CO2 capture, and enhances hydrogen production efficiency, making it suitable for various applications including fuel cells, power generation, and fertilizer production while minimizing environmental impact.
Implementation Method 1
cooling the process stream to a temperature within about 15° C. of a freezing point of the two phase stream
Implementation Method 2
expanding the two phase stream so as to reduce the temperature of the two phase stream
Implementation Method 3
catalytic reactors, which convert CO by reaction with contained steam to produce H2+CO2
Data Source
AI summary
The present disclosure relates to systems and methods useful for providing one or more chemical compounds in a substantially pure form. In particular, the systems and methods can be configured for separation of carbon dioxide from a process stream, such as a process stream in a hydrogen production system. As such, the present disclosure can provide systems and method for production of hydrogen and/or carbon dioxide.