Kaolin-Bound Zeolite Desiccant for Alkali-Resistant Hydrogen Drying
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Solution Overview
Problem
Existing solid desiccants used for drying molecular hydrogen produced by basic electrolysis are not resistant to traces of alkaline hydroxides, such as potassium hydroxide, which limits their stability and effectiveness.
Innovation Solution
The use of a solid desiccant comprising at least one kaolin compound, specifically zeolite agglomerates with a kaolin binder, which provides stability and resistance to alkaline hydroxides, allowing for effective drying of wet molecular hydrogen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If clay-based agglomeration binders are used to shape zeolite crystals, then the zeolite can be formed into handleable beads or threads, but the binder becomes sensitive to inorganic bases like sodium hydroxide or potassium hydroxide, resulting in insufficient stability under basic electrolysis conditions
Solution Approach 1:
The patent changes the chemical composition parameter of the binder from clay-based to silicate-based (specifically water-soluble silicate solution), which fundamentally alters the binder's chemical properties to become resistant to inorganic bases while maintaining the ability to form stable agglomerates
Solution Approach 2:
The patent creates a composite material system combining zeolite crystals with silicate-based binder, forming a new composite agglomerate that inherits the drying functionality of zeolite while gaining base resistance from the silicate binder matrix
2Productivity
If conventional solid desiccants are used for drying wet molecular hydrogen, then drying capability is achieved, but the desiccants are degraded by traces of alkaline hydroxides, limiting their stability and effectiveness
Solution Approach 1:
The patent modifies the chemical composition of the binder component in the solid desiccant from clay-based to silicate-based, changing its chemical resistance properties to withstand alkaline hydroxides while preserving the drying functionality of the zeolite crystals
Solution Approach 2:
The patent creates a durable, reusable solid desiccant that eliminates the need for frequent replacement due to base degradation, transforming the temporary/short-lived nature of conventional desiccants into a long-lasting stable material
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 proposed solution significantly enhances the stability and resistance of solid desiccants to basic compounds, resulting in improved drying efficiency and purity of molecular hydrogen, with reduced contamination and pressure drop issues.
Implementation Method 1
Zeolite agglomerates, also known as molecular sieves, are among the most efficient desiccating agents and make it possible to achieve very low residual water contents of the order of a part per million. This extreme ability to adsorb water molecules is one of the characteristics of zeolites
Data Source
AI summary
The present invention relates to the use, for the drying of wet gas comprising traces of alkaline hydroxide, of a solid desiccant comprising at least one kaolin compound.The invention also relates to the process for drying wet gas comprising traces of alkaline hydroxide, comprising at least one stage of bringing said wet gas into contact with a solid desiccant comprising at least one kaolin compound.