CHA Zeolite Membrane Composite for Acid-Resistant Organic Dehydration
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Solution Overview
Problem
Existing zeolite membrane composites face challenges in achieving high separation selectivity and durability, particularly in the separation and concentration of water-containing organic compounds, with existing techniques not adequately addressing both high separation characteristics and acid resistance.
Innovation Solution
A porous support-zeolite membrane composite with specific permeance and permeability values, combined with a CHA-type zeolite membrane having controlled SiO2/Al2O3 molar ratios and X-ray diffraction patterns, is developed to enhance separation performance and acid resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a zeolite membrane composite is used to separate water-containing organic compounds, then separation selectivity is improved, but acid resistance and durability are insufficient
Solution Approach 1:
The invention uses a composite structure combining inorganic porous support with CHA-type zeolite membrane layer. The inorganic support provides mechanical strength and acid resistance, while the zeolite membrane provides separation selectivity. This composite approach allows both high separation performance (CO2 permeance of 1.0×10^-7 to 1.0×10^-6 mol/m²sPa) and durability (acid resistance) to be achieved simultaneously.
2Measurement precision
If zeolite membrane thickness is reduced to improve separation performance, then separation selectivity is improved, but mechanical strength and durability are worsened
Solution Approach 1:
The invention applies different properties to different parts of the membrane composite. The thin zeolite membrane layer (providing separation performance) is supported by a robust inorganic porous support structure (providing mechanical strength). This local differentiation allows the membrane to achieve high separation selectivity without compromising mechanical durability.
3Productivity
If separation membrane permeability is increased to improve processing capacity, then productivity is improved, but separation selectivity is worsened
Solution Approach 1:
The invention optimizes the permeance parameters of the zeolite membrane by controlling the SiO2/Al2O3 molar ratio and membrane thickness. The CO2 permeance is maintained within a specific range (1.0×10^-7 to 1.0×10^-6 mol/m²sPa), which balances processing capacity with separation selectivity. This parameter optimization allows high productivity while maintaining excellent separation performance.
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 excellent separation performance and acid resistance, effectively separating and concentrating water-containing organic mixtures with low water content, while reducing defects and thermal expansion-induced defects.
Implementation Method 1
membrane separation using zeolite membranes has advantages in that, besides a low energy usage as compared with the other methods, the ranges of applicable substances and temperatures for separation and concentration are wide
Implementation Method 2
in gas separation such as separating carbon dioxide from a mixed gas of carbon dioxide and methane to concentrate the methane, separation methods such as membrane separation
Implementation Method 3
the porous support-zeolite membrane composite having a CF4 permeance of not more than 5.0×10−9 mol/(m2·s·Pa), the zeolite membrane having a thickness of not more than 15 μm
Data Source
AI summary
An object of an aspect of the present disclosure is to provide a porous support-zeolite membrane composite having excellent separation performance. A porous support-zeolite membrane composite in accordance with an aspect of the present disclosure has a CF4 permeance of not more than 5.0×10−9 mol/(m2·s·Pa), and the zeolite membrane has a thickness of not more than 15 μm.