Reverse Osmosis Membrane Coating for High-Temperature Wastewater
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Solution Overview
Problem
Commercial reverse osmosis membranes have poor high-temperature resistance, leading to reduced desalination performance and increased energy consumption when treating high-temperature wastewater, limiting their application in industries such as food, textile, and petrochemical sectors.
Innovation Solution
A preparation method for a reverse osmosis membrane involving the synthesis of an α-cyclodextrin@polyethylene glycol supramolecular inclusion complex, followed by interfacial polymerization to form a polyamide separation layer and α-CD@PEG polyester protection layer, enhancing thermal stability and resistance to high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If commercial reverse osmosis membranes are used for high-temperature wastewater treatment, then the membrane structure undergoes thermal expansion and pore size increases, but the desalination performance deteriorates
Solution Approach 1:
The invention modifies the chemical composition parameters of the separation layer by incorporating aromatic amines with specific functional groups (carboxyl, hydroxyl, or amide groups) into the polyamide matrix. This changes the thermal and structural parameters of the membrane, enabling it to maintain stable pore size and separation performance at elevated temperatures up to 80°C without the detrimental expansion observed in conventional membranes
Solution Approach 2:
The invention creates a composite membrane structure by combining polyamide base material with aromatic amine additives that have specific functional groups. This composite approach enhances the thermal stability and structural integrity of the separation layer, allowing the membrane to resist thermal expansion and maintain desalination performance at high temperatures while still achieving effective salt rejection
2Reliability
If temperature is decreased before membrane separation and then heated back, then high-temperature wastewater can be treated, but energy consumption increases and greenhouse gas emissions rise
Solution Approach 1:
The invention enables the membrane system to directly process high-temperature wastewater without requiring external cooling and reheating systems. The specialized separation layer inherently resists thermal damage and maintains performance at elevated temperatures, allowing the membrane to serve itself and eliminate the need for additional energy-intensive temperature control equipment and processes
3Reliability
If conventional reverse osmosis membranes operate below 45°C, then desalination performance is maintained, but application scope is limited in industries producing high-temperature wastewater
Solution Approach 1:
The invention fundamentally changes the thermal parameter range of reverse osmosis membranes by incorporating aromatic amines with functional groups that stabilize the polyamide network at elevated temperatures. This allows the membrane to reliably operate from ambient temperature up to 80°C, expanding its operational window and making it suitable for diverse industrial applications including food processing, textile manufacturing, and petrochemical wastewater treatment where high-temperature streams are common
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 resulting membrane maintains high desalination efficiency and flux across a wide temperature range, effectively treating high-temperature wastewater while reducing energy consumption and greenhouse gas emissions.
Implementation Method 1
synthesis of an α-cyclodextrin@polyethylene glycol supramolecular inclusion complex (α-CD@PEG) by a saturated aqueous solution coprecipitation method
Implementation Method 2
interfacial polymerization: taking a base membrane from water, blowing water away from the surface of the base membrane with nitrogen, and pouring the aqueous phase solution onto the surface of the base membrane
Implementation Method 3
Reverse osmosis membranes have been widely applied to seawater desalinization, wastewater treatment, food and pharmaceutic refinement, drinking water purification
Data Source
AI summary
The invention provides a preparation method for a reverse osmosis membrane resistant to a high-temperature water environment, comprising: synthesizing an α-cyclodextrin@polyethylene glycol supramolecular inclusion complex by a saturated aqueous solution coprecipitation method; preparing an aqueous phase solution containing m-phenylenediamine, D(+) camphorsulfonic acid and triethylamine; preparing an oil phase solution containing trimesoyl chloride; preparing a secondary aqueous solution containing α-cyclodextrin@polyethylene glycol powder and triethylamine; forming an ultrathin polyamide separation layer on a base membrane by interfacial polymerization; and performing secondary interfacial polymerization to form an α-CD@PEG polyester protection layer, and storing a prepared reverse osmosis membrane in ultrapure water.