CHA Zeolite Membrane Composite for Acid Separation
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Solution Overview
Problem
Current zeolite membranes for organic material separation or concentration, such as those using mordenite or ferrierite types, face limitations in permeation flux and stability, especially with organic acids, leading to insufficient treating amounts and separation performance for practical applications.
Innovation Solution
An inorganic porous support-zeolite membrane composite with a CHA-type zeolite crystal layer, optimized through specific X-ray diffraction patterns and molar ratios of SiO2/Al2O3, is developed, allowing for enhanced permeation flux and acid resistance, enabling effective separation or concentration of organic material-containing mixtures, including those with organic acids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional zeolite membranes (mordenite or ferrierite types) are used for organic material separation, then separation performance is achieved, but permeation flux is insufficient and stability deteriorates in the presence of organic acids
Solution Approach 1:
The invention changes the chemical composition parameters of the zeolite membrane by specifying a SiO2/Al2O3 molar ratio of 5 or more, which fundamentally alters the membrane's properties to achieve both high permeation flux and stability in organic acid environments. This parameter optimization resolves the contradiction by enabling the membrane to simultaneously achieve high productivity and reliability.
Solution Approach 2:
The invention creates a composite structure by forming a zeolite layer on an inorganic porous support, combining the separation capabilities of zeolite with the mechanical strength and porosity of the support material. This composite approach enables both high permeation flux through the porous support and stable separation performance with organic acids through the zeolite layer.
2Ease of manufacture
If polymer membranes are used for membrane separation, then processability is excellent, but heat resistance and chemical resistance are poor
Solution Approach 1:
The invention replaces polymer materials with inorganic zeolite materials, substituting organic-based membranes with inorganic-based membranes. This substitution maintains the membrane separation functionality while dramatically improving heat resistance and chemical resistance, allowing the membrane to operate in high-temperature and chemically aggressive environments.
Solution Approach 2:
The invention utilizes porous inorganic materials (zeolite and inorganic porous support) to create a membrane structure that provides both mechanical integrity and separation functionality. The porous structure enables high permeation flux while the inorganic composition ensures excellent heat and chemical resistance.
3Use of energy by moving object
If zeolite membranes are used for organic material separation, then energy consumption is reduced compared to distillation, but treating amount and separation performance are insufficient for practical use
Solution Approach 1:
The invention optimizes the SiO2/Al2O3 molar ratio to 5 or more, which fundamentally changes the membrane's permeation characteristics. This parameter optimization simultaneously increases permeation flux (treating amount) and maintains separation performance, making the low-energy membrane separation process practically viable for industrial applications.
Solution Approach 2:
The composite structure of zeolite layer on inorganic porous support combines the advantages of both materials: the zeolite provides selective separation performance while the porous support provides high permeation flux. This combination enables practical treating amounts while maintaining energy efficiency.
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 composite achieves a sufficiently high permeation flux and stable separation performance, overcoming previous limitations by ensuring both economic viability and broad application range, particularly in the presence of organic acids, with the CHA-type zeolite membrane demonstrating improved hydrophilicity and acid resistance.
Implementation Method 1
a mixture of an organic material and water is flowed to the zeolite membrane composite, and water is selectively allowed to permeate therethrough, whereby the organic material can be separated or concentrated
Implementation Method 2
a zeolite having hydrophilicity is utilized for selective permeation of water
Implementation Method 3
in the X-ray diffraction pattern obtained by irradiating the zeolite membrane surface of the membrane composite with an X-ray of CuKa
Implementation Method 4
in the X-ray diffraction pattern obtained by irradiating the zeolite membrane surface
Data Source
Figure 1
Figure 2a~2b
Figure 3
AI summary
The present invention relates to an inorganic porous support-zeolite membrane composite, wherein the inorganic porous support-zeolite membrane composite has a CHA-type zeolite crystal layer as the zeolite membrane and in the X-ray diffraction pattern obtained by irradiating the zeolite membrane surface with an X-ray of CuKα, the peak intensity near 2θ=17.9° is 0.5 times or more the peak intensity near 2θ=20.8°.