ETS-10 Titanosilicate Adsorbent for CO2 Removal from Paraffins
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Solution Overview
Problem
Current methods for separating carbon dioxide from natural gas or light paraffins, such as methane and ethane, are inefficient, particularly when using liquid extraction systems like amine scrubbers, which are costly and prone to solvent contamination, and solid adsorbents like activated carbon and molecular sieves that are selective towards ethane over carbon dioxide, limiting their effectiveness in pressure swing adsorption processes.
Innovation Solution
The use of unmodified or modified ETS-10 titanosilicate materials as adsorbents, which selectively adsorb carbon dioxide from mixtures containing light paraffins through pressure swing adsorption, allowing for the separation and enrichment of paraffins by altering the shape of adsorption isotherms and selectivity through cationic and structural modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If activated carbon materials are used for adsorption, then adsorption capacity is achieved, but selectivity towards carbon dioxide is poor (C2H6>CO2>CH4 sequence)
Solution Approach 1:
The patent modifies the pore size parameter of the adsorbent material by using templated high silica zeolites with specifically engineered pore structures. This changes the adsorption selectivity sequence from C2H6>CO2>CH4 (activated carbon) to CO2>C2H6>CH4 (templated zeolites), enabling CO2 to be adsorbed preferentially over ethane and methane.
Solution Approach 2:
The patent employs composite adsorbent systems combining templated high silica zeolites with specific pore structures and surface properties. These composite materials integrate the advantages of high silica content for CO2 affinity with controlled pore architecture for size-based selectivity, achieving both high CO2 capacity and CO2/C2H6 separation.
2Reliability
If classical aluminosilicate zeolites (e.g., 13X) are used, then CO2 selectivity is improved, but the CO2 isotherm shape is too steep for normal PSA processes
Solution Approach 1:
The patent modifies the zeolite structure by increasing silica content and applying templating during synthesis. This changes the CO2 isotherm shape from steep (classical 13X zeolite) to more gradual, creating a more rectangular working capacity curve that is ideal for pressure swing adsorption cycling and regeneration.
Solution Approach 2:
The patent creates local structural variations within the zeolite framework through templating, where specific pore regions are optimized for CO2 adsorption while maintaining overall structural integrity. This local optimization produces the desired isotherm shape without sacrificing CO2 selectivity.
3Quantity of substance
If ZSM-5 is used for CO2 adsorption, then CO2 capacity is achieved, but CO2/C2H6 selectivity is very low
Solution Approach 1:
The patent designs adsorbents with specifically engineered pore size distributions and pore mouth dimensions. The templated zeolites have pore structures that are large enough to accommodate CO2 molecules but with restricted access or lower affinity for larger ethane molecules, achieving both high CO2 capacity and high CO2/C2H6 selectivity simultaneously.
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 effectively increases the proportion of paraffins in gas mixtures by selectively adsorbing carbon dioxide, reducing the need for costly solvent systems and improving the efficiency of carbon dioxide removal, making it suitable for integration with hydrocarbon cracking units and amine-based extraction processes.
Implementation Method 1
ETS-10 titanosilicate materials are used to selectively adsorb carbon dioxide from gaseous mixtures containing carbon dioxide and light paraffins such as methane or ethane
Implementation Method 2
The separation of carbon dioxide (CO2) from natural gas or NGLs is an important step in the petrochemicals industry
Data Source
AI summary
ETS-10 titanosilicate materials selectively adsorb carbon dioxide from gaseous mixtures containing carbon dioxide and light paraffins such as methane and ethane.