PTFE Membrane Contactors for Low-Energy Acrylic Acid Extraction
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Solution Overview
Problem
Existing methods for purifying acrylic acid are energy-inefficient and require frequent shutdowns due to polymerization, leading to high operational costs and complexity.
Innovation Solution
A membrane contactor process using a porous polytetrafluoroethylene (PTFE) membrane with a defined contact area for liquid-liquid extraction of acrylic acid from an aqueous stream into an organic solvent, eliminating the need for phase separation and reducing polymerization by operating at ambient temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If distillation is used to purify acrylic acid, then high purity is achieved, but energy consumption increases significantly
Solution Approach 1:
A liquid membrane acts as an intermediary carrier phase between the aqueous feed stream and the organic extractant. The membrane selectively transports acrylic acid from the aqueous phase into the organic phase through diffusion, enabling separation without direct mixing of the two immiscible phases. This mediator approach replaces energy-intensive distillation with a mass-transfer-based extraction process.
Solution Approach 2:
The patent replaces the thermal field (distillation requiring heating) with a mass transfer field (extraction based on diffusion). By using a liquid membrane contactor, the separation process shifts from thermal energy-driven distillation to concentration-gradient-driven diffusion, significantly reducing energy consumption while maintaining high purity.
2Manufacturing precision
If distillation columns are used for acrylic acid purification, then separation is achieved, but polymerization occurs requiring frequent shutdowns
Solution Approach 1:
The patent changes the operating parameters from high-temperature distillation to ambient-temperature extraction. By conducting the separation at lower temperatures through the liquid membrane contactor, the process suppresses thermal polymerization of acrylic acid, eliminating the need for frequent shutdowns to clear polymerized material from columns.
Solution Approach 2:
The liquid membrane serves as a protective intermediary that enables separation without exposing acrylic acid to the high temperatures that cause polymerization. The membrane contactor facilitates mass transfer at ambient conditions, preventing the harmful thermal effects that lead to operational interruptions.
3Use of energy by moving object
If extraction process is used instead of distillation, then energy consumption is reduced, but phase separation complexity is introduced
Solution Approach 1:
The liquid membrane acts as a stabilizing intermediary that maintains distinct phase boundaries between the aqueous feed and organic extractant. This prevents direct mixing and emulsion formation, simplifying the process by eliminating the need for additional phase separation equipment while maintaining the energy advantages of extraction.
Solution Approach 2:
The liquid membrane functions as a flexible thin film barrier that provides a large surface area for mass transfer while maintaining phase separation. This thin-film approach enables efficient extraction without requiring complex mechanical mixing or separation devices, reducing overall process complexity.
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 process achieves efficient acrylic acid extraction with reduced energy consumption and extended operational reliability by preventing polymerization, allowing for continuous operation with lower mechanical complexity and cost.
Implementation Method 1
The acrylic acid first diffuses from the aqueous medium into the selective membrane and then into the other phase
Implementation Method 2
A membrane contactor process using a porous polytetrafluoroethylene (PTFE) membrane with a defined contact area for liquid-liquid extraction of acrylic acid from an aqueous stream into an organic solvent
Implementation Method 3
A membrane contactor process using a porous polytetrafluoroethylene (PTFE) membrane with a defined contact area
Data Source
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AI summary
The invention relates to the extraction of acrylic acid from aqueous streams. The aim of the invention is to provide a process for extracting acrylic acid from aqueous streams with a low energy expenditure and allowing longer operating times. This aim is achieved in that, in order to extract the acrylic acid, the aqueous stream containing the acrylic acid is brought into contact with a membrane whose side facing away from the aqueous stream is subjected to an organic solvent.