Doped Silicalite Ceramic Membrane for Non-Aqueous Separation
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Solution Overview
Problem
There is a need for a membrane technology suitable for molecular separation in non-aqueous systems, as existing zeolite ceramic membranes are not effective for treating water with high solvent content, and zeolite-loaded polymer composite membranes face issues with swelling, limiting their use in organic solvent streams.
Innovation Solution
A method for producing a silicalite membrane involves forming silicalite seeds with dopants and structure-directing templates, depositing them on a ceramic substrate with a buffer layer, and removing templates to create a continuous layer with hollow structures, suitable for molecular separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If zeolite ceramic membranes are used for molecular separation, then separation performance is improved, but they are not effective for treating water with high solvent content
Solution Approach 1:
The patent modifies the pore size parameter of the zeolite crystal structure by incorporating dopants (such as Al, Ga, In, La, Nb, Ta, Ti, W, Mo, or Sn) to create dopant-substituted silicalite-1 crystals. This changes the physical chemistry parameters of the membrane to enable it to handle high solvent content water while maintaining separation performance.
Solution Approach 2:
The patent creates a composite membrane structure combining dopant-substituted silicalite-1 crystals with a porous ceramic support. This composite approach allows the membrane to achieve both high separation performance and adaptability to high solvent content water treatment by leveraging the properties of both materials.
2Adaptability or versatility
If zeolite-loaded polymer composite membranes are used, then they can treat water with high solvent content, but they face swelling issues limiting use in organic solvent streams
Solution Approach 1:
The patent uses a porous ceramic support as the foundation for the membrane structure. This porous ceramic matrix provides mechanical stability and prevents the swelling issues that plague polymer composite membranes, while still allowing the dopant-substituted silicalite-1 crystals to provide the necessary separation functionality.
Solution Approach 2:
The patent creates a composite structure where dopant-substituted silicalite-1 crystals are embedded in a porous ceramic support. This composite approach eliminates the swelling problem of polymer membranes while maintaining the ability to treat high solvent content water, as the ceramic matrix provides structural stability.
3Productivity
If reverse osmosis membranes are used for molecular separation, then separation efficiency is improved, but polymer swelling restricts use to water treatment only
Solution Approach 1:
The patent changes the material composition parameter by using dopant-substituted silicalite-1 crystals instead of conventional polymer materials. This parameter change eliminates polymer swelling and enables the membrane to handle non-aqueous systems and high solvent content water, greatly expanding application range while maintaining separation efficiency.
Solution Approach 2:
The patent employs a composite structure combining dopant-substituted silicalite-1 crystals with porous ceramic support. This composite material approach provides both high separation efficiency and broad adaptability across different application types, including water treatment, high solvent content water, and non-aqueous systems.
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 silicalite membrane provides effective molecular separation in non-aqueous systems without swelling, being versatile for organic solvent separations and maintaining consistent pore sizes for efficient filtration.
Implementation Method 1
The principle in general is that the membrane acts as a specific filter that allows certain substance with distinct molecule size to flow through, rejecting the rest with larger dimensions
Implementation Method 2
each of the silicalite crystals has a hollow structure which forms the pores of the silicalite layer
Data Source
AI summary
A method of producing a silicalite membrane, which includes heating an aqueous solution that includes a dopant precursor and structure-directing template agents to form silicalite seeds incorporated with a dopant, depositing a buffer layer on a ceramic substrate prior to depositing the silicalite seeds on the buffer layer, contacting the ceramic substrate with a solution including the silicalite seeds to form a silicalite layer from the silicalite seeds on the ceramic substrate, and removing the structure-directing template agents to form the silicalite membrane, where the silicalite layer includes silicalite crystals incorporated with a dopant and each of the silicalite crystals has a hollow structure which forms the pores of the silicalite layer. The silicalite membrane includes a ceramic substrate having a buffer layer formed thereon, and a silicalite layer formed on the buffer layer, where the silicalite layer includes silicalite crystals incorporated with a dopant.