High Temperature-Resistant Composite Nanofiltration Membrane
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional nanofiltration membranes have a limited temperature tolerance of 45°C, which restricts their effectiveness and stability when processing high-temperature wastewater, leading to reduced filtration performance and potential structural damage.
Innovation Solution
A high temperature-resistant composite nanofiltration membrane is developed, comprising a base membrane coated with a polyamide layer prepared from specific raw materials including an amine, inorganic salt, silane additive, and polyacyl chloride, with a heat treatment process to enhance thermal stability, allowing operation up to 70°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional nanofiltration membranes are used, then filtration performance is maintained at low temperatures, but temperature tolerance is limited to 45°C
Solution Approach 1:
The patent uses composite materials by combining polyamide coating layer with thermally stable base membranes (polybenzimidazole or polyether sulfone). The polyamide layer provides filtration performance while the base membrane provides thermal stability, allowing the composite structure to maintain both filtration efficiency and temperature tolerance up to 70°C
Solution Approach 2:
The patent changes the chemical composition parameters of the membrane by introducing thermally stable polymers (polybenzimidazole with imidazole rings or polyether sulfone with sulfone groups) that have higher thermal stability. This parameter change in material composition enables the membrane to withstand temperatures up to 70°C without degradation
2Productivity
If nanofiltration membranes operate at high temperatures, then wastewater recycling efficiency improves, but membrane structure may be destroyed
Solution Approach 1:
The composite structure combines the filtration-functional polyamide layer with thermally robust base membranes. This allows the membrane to operate at elevated temperatures (up to 70°C) for efficient wastewater recycling while the thermally stable base membrane prevents structural destruction
Solution Approach 2:
The patent selects base membrane materials with inherently high thermal stability (polybenzimidazole or polyether sulfone) before the membrane is put into service. This beforehand selection of thermally resilient materials cushions against potential structural damage when the membrane operates at high temperatures for wastewater recycling
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 membrane maintains high filtration performance and structural integrity at elevated temperatures, effectively recycling high-temperature wastewater while reducing energy consumption and operating pressure.
Implementation Method 1
immersing the base membrane in the aqueous phase solution to obtain a primary base membrane; and then immersing the primary base membrane in the oil phase solution to obtain an immersed base membrane; and subjecting the immersed base membrane to a heat treatment to obtain the high temperature-resistant composite nanofiltration membrane
Implementation Method 2
the silane additive comprises at least one selected from the group consisting of 3-aminopropyltriethoxysilane, divinyltriaminopropyltrimethoxysilane, N-cyclohexyl-γ-aminopropyltrimethoxysilane, and trimethoxy[3-(phenylamino)propyl]silane
Implementation Method 3
the nanofiltration membrane could selectively separate inorganic salts with different valence states, thereby reducing operating pressure and energy consumption
Implementation Method 4
the nanofiltration membrane could highly intercept bacteria and viruses to ensure the safety of aqueous media
Data Source
AI summary
Provided are a high temperature-resistant composite nanofiltration membrane and a preparation method thereof. The high temperature-resistant composite nanofiltration membrane includes a base membrane and a polyamide membrane arranged on the base membrane; wherein the polyamide membrane is prepared from raw materials comprising: an amine, an inorganic salt, a silane additive, a polyacyl chloride, and an oil phase solvent; and the silane additive is at least one selected from the group consisting of 3-aminopropyltriethoxysilane, divinyltriaminopropyltrimethoxysilane, N-cyclohexyl-γ-aminopropyltrimethoxysilane, and trimethoxy[3-(phenylamino)propyl]silane.