Oleophobic Membrane Distillation Modules
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Solution Overview
Problem
Vapor permeable-liquid impermeable microporous membranes used in liquid distillation are prone to clogging and fouling due to their oleophilic nature, leading to reduced pure liquid flux and membrane lifespan.
Innovation Solution
Applying an oleophobic material to the membrane surfaces to prevent contamination and fouling, while maintaining a temperature gradient across the membrane to facilitate vapor transport and distillation, using a system with a vapor permeable-liquid impermeable microporous membrane, a heating mechanism for the non-distilled liquid, and a cooling mechanism for the distilled liquid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an oleophobic material is applied to the membrane surface, then resistance to oil and organic contamination is improved, but the complexity of the membrane structure increases
Solution Approach 1:
The oleophobic material is applied to the membrane surface in advance during manufacturing, creating a pre-coated membrane that resists contamination before use. This preliminary action prevents the need for ongoing maintenance and simplifies the operational complexity despite the added manufacturing step.
Solution Approach 2:
The membrane becomes a composite structure combining the base microporous membrane material with the oleophobic coating layer. This composite approach integrates contamination resistance directly into the membrane structure, eliminating the need for separate protective systems.
2Duration of action of stationary object
If the membrane is made oleophobic to prevent fouling, then membrane lifespan is extended, but the initial cost and manufacturing complexity increase
Solution Approach 1:
The oleophobic coating is applied during the membrane manufacturing process itself, rather than as a separate post-processing step. This integration ensures uniform coverage and eliminates additional handling steps, maintaining manufacturing efficiency while extending membrane lifespan.
Solution Approach 2:
The manufacturing process parameters are adjusted to incorporate the oleophobic coating application, such as modifying coating thickness, curing temperature, or deposition methods. These parameter changes optimize the coating application while maintaining compatibility with existing manufacturing infrastructure.
3Reliability
If the oleophobic coating is applied thickly to maximize protection, then contamination resistance improves, but vapor permeability may be reduced
Solution Approach 1:
The oleophobic coating is applied with varying local properties - thicker in areas prone to higher contamination and thinner in areas where vapor transmission is critical. This localized quality optimization balances protection needs with performance requirements across different membrane regions.
Solution Approach 2:
The coating thickness parameter is precisely controlled and optimized to a specific range that provides adequate oleophobic protection while maintaining sufficient vapor permeability. This parameter optimization ensures both contamination resistance and productivity are achieved simultaneously.
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 oleophobic coating enhances the membrane's resistance to oil and organic contamination, maintaining high moisture vapor transmission rates and extending the membrane's lifespan by preventing fouling, thereby ensuring efficient and prolonged distillation performance.
Implementation Method 1
an oleophobic material that is applied to the structures of the vapor permeable-liquid impermeable microporous membrane so as to leave the plurality of pores open
Implementation Method 2
maintaining the non-distilled liquid supplied to the first side of the vapor permeable-liquid impermeable microporous membrane at a first temperature while maintaining the distilled liquid collected from the second side of the vapor permeable-liquid impermeable microporous membrane at a second temperature lower than the first temperature, maintaining a great enough temperature difference between the first and second temperatures so as to cause a net flux of the distilled liquid across the vapor permeable-liquid impermeable microporous membrane
Implementation Method 3
An ePTFE membrane is desirable for filtering due to its chemical inertness and inherent hydrophobicity, thus allowing it to resist the flow of liquid therethrough above a certain surface tension
Data Source
AI summary
The present invention provides a system for liquid distillation which includes a vapor permeable-liquid impermeable microporous membrane having structures defining a plurality of pores, an oleophobic material that is applied to the structures of the membrane so as to leave the plurality of pores open, a means for supplying non-distilled liquid to the first side of the membrane, and a means for collecting distilled liquid from a second side of the membrane. In a further example, the present invention provides a method for the distillation of liquids.