CHA Zeolite Membrane Composite for Acid-Resistant High-Flux Separation
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Solution Overview
Problem
Existing zeolite membrane composites for separating water-containing organic compounds lack sufficient selectivity and durability, particularly in terms of acid resistance and permeation flux.
Innovation Solution
A porous support-zeolite membrane composite with specific permeance and permeability values, a controlled SiO2/Al2O3 molar ratio, and optimized X-ray diffraction patterns is developed, featuring a CHA-type zeolite membrane with controlled crystal orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If zeolite membrane composites are used for separating water-containing organic compounds, then separation selectivity is improved, but durability and acid resistance are insufficient
Solution Approach 1:
The invention uses a composite structure consisting of a porous support and a zeolite membrane layer. The porous support provides mechanical strength and durability, while the zeolite membrane layer provides high separation selectivity. This composite approach resolves the contradiction by combining materials with complementary properties.
Solution Approach 2:
The zeolite membrane layer is formed with specific local characteristics including controlled SiO2/Al2O3 ratio, crystal orientation, and thickness. These localized quality controls enhance both separation performance and acid resistance without compromising overall durability.
2Measurement precision
If zeolite membrane composites are used for separation, then separation performance is improved, but permeation flux is insufficient
Solution Approach 1:
The invention optimizes several parameters including SiO2/Al2O3 ratio, membrane thickness, and crystal orientation to achieve both high separation performance and adequate permeation flux. By carefully controlling these parameters, the membrane maintains selectivity while allowing sufficient throughput.
Solution Approach 2:
The invention addresses permeation flux limitations by considering the membrane in multiple dimensions - controlling thickness in the vertical dimension while optimizing surface area in the horizontal dimension. This multi-dimensional approach allows improved flux without sacrificing separation performance.
3Loss of energy
If zeolite membrane composites are used for concentration, then energy efficiency is improved, but applicability range is limited
Solution Approach 1:
The zeolite membrane composite is designed with universal applicability by selecting zeolite types and compositions that can handle various substances including water-containing organic compounds, gases, and different molecular sizes. The same basic structure serves multiple separation functions across different applications.
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 enhanced separation performance and acid resistance, effectively separating and concentrating water-containing organic mixtures with improved permeation flux and reduced defects.
Implementation Method 1
membrane separation using zeolite membranes
Implementation Method 2
adsorbent-based separation
Implementation Method 3
membrane separation using zeolite membranes
Implementation Method 4
membrane separation using zeolite membranes
Implementation Method 5
X-ray diffraction (XRD) pattern
Implementation Method 6
X-ray diffraction (XRD) pattern
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
An object of an aspect of the present invention 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 invention 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.