ERI Zeolite Membrane Dehydration for Stability
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Solution Overview
Problem
Existing dehydration methods using zeolite membranes face degradation issues due to partial dissolution of A-type zeolite membranes and poor acid resistance, leading to compromised separation performance over time.
Innovation Solution
A dehydration method employing a zeolite membrane with an ERI structure, which maintains durability and separation efficiency by creating a pressure difference between the supply and permeation sides, utilizing a porous support with ERI crystals that are oriented to enhance bonding and density, thereby preventing degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If A-type zeolite membrane is used for dehydration, then dehydration function is achieved, but membrane dissolves partially in water over long period causing performance degradation
Solution Approach 1:
The patent changes the crystal structure parameter of the zeolite membrane from A-type (LTA structure) to ERI structure. This parameter change in the membrane's fundamental structure provides superior water stability and prevents dissolution, thereby resolving the contradiction between achieving dehydration function and maintaining long-term structural stability.
Solution Approach 2:
The patent employs a composite membrane structure consisting of an ERI-structure zeolite layer formed on a porous support. This composite design combines the selective dehydration capability of zeolite with the mechanical strength of the porous support, achieving both high reliability in dehydration performance and structural stability over long periods.
2Object-affected harmful factors
If T-type zeolite membrane is used for dehydration, then acid resistance is improved, but pores are larger than required allowing non-selective permeation
Solution Approach 1:
The patent changes the crystal structure parameter from T-type zeolite to ERI-structure zeolite. The ERI structure provides both the required acid resistance and the precise pore size control needed for selective water permeation, resolving the contradiction between acid resistance and pore size precision.
3Object-affected harmful factors
If zeolite membrane with OFF structure is used, then acid resistance is improved, but membrane density is insufficient reducing separation performance
Solution Approach 1:
The patent changes the crystal structure parameter to ERI-structure zeolite, which provides both high acid resistance and sufficient membrane density. The ERI structure's inherent density characteristics ensure proper separation performance while maintaining acid resistance, resolving the contradiction between these two properties.
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 method effectively suppresses degradation of dehydration performance, ensuring long-term maintenance of separation efficiency and selectivity for water separation from mixtures.
Implementation Method 1
making a pressure difference between the supply side space and a permeation side space of the zeolite membrane having an ERI structure
Implementation Method 2
making a pressure difference between the supply side space and a permeation side space of the zeolite membrane
Data Source
AI summary
A dehydration method is a dehydration method for selectively separating water from a mixture that contains water, and the method includes a step of supplying the mixture to a supply side space of a zeolite membrane having an ERI structure, and a step of making a pressure difference between the supply side space and a permeation side space of the zeolite membrane having an ERI structure.