Composite Reverse Osmosis Membrane High Temperature Resistance
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Solution Overview
Problem
Existing reverse osmosis membranes suffer from poor high-temperature resistance, short service life, and low water flux, limiting their effectiveness in industrial filtration applications where temperatures exceed room temperature and membrane performance degrades rapidly.
Innovation Solution
A composite reverse osmosis membrane is developed with a support layer made from fluorine-containing polyaryletherketone and silane-modified polyaryletherketone, combined with a polyamide functional layer and a modified polyvinyl alcohol anti-pollution layer, and doped with graphene oxide to enhance thermal stability and water flux.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a three-layer composite structure is used to improve salt rejection rate and water flux, then membrane separation performance is enhanced, but total membrane thickness increases to 140 micrometers or thicker
Solution Approach 1:
The patent uses a thin film composite structure where a dense polyamide separation layer (thickness 0.1-10 micrometers) is formed on a porous support layer. This thin film approach achieves high salt rejection and water flux without requiring thick membrane structures, reducing total thickness from conventional 140 micrometers to significantly thinner dimensions while maintaining separation performance.
Solution Approach 2:
The patent employs a porous support layer with controlled pore structure that provides mechanical strength while allowing efficient water transport. The porous structure enables the support layer to be thin yet strong, contributing to overall membrane thinness while maintaining high water flux and salt rejection capabilities.
2Productivity
If conventional polyamide structure is used to achieve high flux and high desalination, then membrane separation efficiency is improved, but high-temperature resistance deteriorates
Solution Approach 1:
The patent creates a composite membrane system combining polyamide separation layer with polyether sulfone support layer. This composite structure integrates the high flux and desalination capabilities of polyamide with the superior thermal stability and mechanical strength of polyether sulfone, achieving both high productivity and high-temperature resistance simultaneously.
Solution Approach 2:
The patent modifies the support layer material composition and structural parameters (pore size, porosity, crosslinking degree) to enhance thermal stability. By adjusting these parameters, the membrane maintains its structural integrity and separation performance at elevated temperatures while preserving high water flux characteristics.
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 membrane exhibits improved high-temperature resistance, extended service life, and increased water flux, maintaining stable performance and salt rejection rates even at elevated temperatures.
Implementation Method 1
Reverse osmosis technology is a membrane separation technology that intercepts solutes in a solution with a semi-permeable membrane by using the pressure as the driving force
Implementation Method 2
carrying out an interfacial polycondensation reaction on the support layer to generate a polyamide three-dimensional cross-linked structure to form a desalination functional layer
Implementation Method 3
graphene and modified graphene have emerged as a new material in people's eyes. Graphene is an atomic crystal formed by sp2 hybridization of carbon atoms and having a two-dimensional honeycomb structure with a single atomic layer. In graphene, in addition to a peroxy bond that simply introduces oxygen atoms, other functional groups exist in the structure, such as carbonyl (═CO), hydroxyl (—OH), and phenolic hydroxyl groups, so that graphene has high hydrophilcity and excellent antibacterial activity
Data Source
AI summary
The present application discloses a composite reverse osmosis membrane and a preparation method thereof. The method includes: uniformly mixing fluorine-containing polyaryletherketone of a certain concentration and silane-modified polyaryletherketone as a casting solution; coating a non-woven fabric, i.e., a substrate, with the casting solution to form a support layer; then coating the surface of the support layer with a solution A and a solution B sequentially for reaction to form a polyamide desalination layer; and coating the polyamide desalination layer with a modified polyvinyl alcohol anti-pollution layer. By means of the method, the composite reverse osmosis membrane is prepared. Compared with the prior art, the present application can prepare a composite reverse osmosis membrane with high temperature resistance and high strength by using the composite modified polyaryletherketone as the support layer, and moreover, uses polyvinyl alcohol as a component of the anti-pollution layer, and has good anti-pollution properties.