Multi-Channel Membrane Spinneret Unit with Dual Separation Layers
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Solution Overview
Problem
Current spinneret units for producing multi-channel membranes lack efficiency in creating separation-active layers with distinct pore sizes and resistance properties, limiting their applicability in liquid processing applications such as nanofiltration, ultrafiltration, and microfiltration.
Innovation Solution
A spinneret unit with an extrusion unit and internal fluid introduction unit that allows for the formation of multi-channel membranes with separate separation-active layers on the outer and inner surfaces, using a single coagulant and specific polymer solutions to achieve distinct pore sizes and resistance properties, enabling efficient filtration and expanded application ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single coagulant is used for membrane production, then manufacturing complexity and cost are reduced, but the ability to create distinct separation-active layers with different pore sizes is limited
Solution Approach 1:
The patent applies local quality by creating different separation-active layers with distinct pore sizes at different locations (inner and outer surfaces) of the membrane. This is achieved by controlling the coagulation process locally through the spinneret geometry and fluid introduction, allowing each surface to develop unique separation properties tailored to specific filtration needs while using a single coagulant system.
Solution Approach 2:
The patent employs preliminary action by pre-configuring the spinneret with specific geometric parameters and fluid introduction channels before the coagulation process begins. This preliminary setup determines the flow patterns and coagulation conditions that will create the desired dual-layer pore structure, enabling precise control over separation-active layer formation without requiring multiple coagulants or post-processing steps.
2Adaptability or versatility
If separation-active layers with distinct pore sizes are created, then applicability in different filtration applications is expanded, but manufacturing complexity increases
Solution Approach 1:
The patent achieves universality by designing a single spinneret unit that can produce membranes suitable for multiple filtration applications (nanofiltration, ultrafiltration, microfiltration). The dual separation-active layer structure with different pore sizes allows the same membrane to handle various molecular weight cutoffs and filtration requirements, making the manufacturing system versatile without requiring multiple specialized devices.
Solution Approach 2:
The patent utilizes parameter changes by adjusting spinneret geometric parameters (channel dimensions, angles, positions) and process parameters (fluid flow rates, coagulant concentration) to create separation-active layers with different pore sizes. These parameter variations enable the production of membranes tailored for different filtration applications while using the same basic spinneret unit, thus expanding adaptability without proportionally increasing device complexity.
3Productivity
If polymer solution composition is optimized for specific pore sizes, then filtration efficiency is improved, but manufacturing flexibility is reduced
Solution Approach 1:
The patent applies dynamics by making the polymer solution composition adjustable and adaptable rather than fixed. The system allows optimization of polymer concentration, solvent type, and additives for specific filtration efficiencies while maintaining the flexibility to modify these parameters for different applications. This dynamic approach enables the same manufacturing process to produce membranes with varying pore sizes and separation properties by simply adjusting the polymer solution formulation.
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 solution enables the production of multi-channel membranes with tailored separation properties, allowing for effective filtration of components up to 2000 Daltons, enhancing processing efficiency and stability, and reducing manufacturing costs by using a single coagulant and optimizing polymer solution composition.
Implementation Method 1
The two separation-active layers are formed by coagulation using a single coagulating agent
Data Source
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AI summary
The invention relates to a multi-channel membrane, in particular for preparing liquid, comprising at least one outer membrane surface (10a) and one inner membrane surface (12a), which forms at least two longitudinally extending inner channels (14a, 16a, 18a), which are enclosed by the outer membrane surface (10a). According to the invention, the outer membrane surface (10a) and the inner membrane surface (12a) each form a separating layer (20a, 22a).