HFO-1132(E) Purification Using Amine Extractive Distillation
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Solution Overview
Problem
Existing methods struggle to efficiently purify trans-1,2-difluoroethylene (HFO-1132(E)) due to its azeotropic or azeotrope-like composition with 1,1,1-trifluoroethane (HFC-143a), making separation difficult.
Innovation Solution
An extractive distillation process using a solvent containing an amine, such as monomethylamine or monoethylamine, is employed to reduce the HFC-143a content in the HFO-1132(E) and HFC-143a mixture, enhancing separation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional distillation methods are used to separate HFO-1132(E) from HFC-143a, then the separation process is simple, but the purification efficiency is insufficient due to azeotropic composition
Solution Approach 1:
Amine solvent acts as an intermediary substance that selectively interacts with HFC-143a, forming a temporary complex that facilitates its separation from HFO-1132(E). The amine solvent mediates the separation process by exploiting differences in intermolecular forces between the components, enabling efficient purification despite the azeotropic nature of the mixture.
Solution Approach 2:
The patent changes the physical-chemical parameters of the separation system by introducing an amine solvent with specific intermolecular force characteristics. This parameter change alters the relative volatility and interaction energies between HFC-143a and HFO-1132(E), enabling effective separation that conventional distillation cannot achieve alone.
2Manufacturing precision
If extractive distillation with amine solvent is used to reduce HFC-143a content, then the purification efficiency is improved, but the process complexity increases
Solution Approach 1:
The amine solvent serves as a selective intermediary that forms strong intermolecular complexes with HFC-143a through dipole-dipole interactions and hydrogen bonding. This selective interaction creates a temporary complex that can be easily separated from HFO-1132(E), achieving high purification efficiency while maintaining reasonable process complexity through the use of a single solvent addition step.
3Manufacturing precision
If multiple distillation steps are performed to achieve high purity, then the HFO-1132(E) purity increases, but the production time and energy consumption increase
Solution Approach 1:
The amine solvent acts as a selective intermediary that accelerates the separation process by forming temporary complexes with HFC-143a. This intermediary mechanism enables high purity (99.9% or more) to be achieved in fewer distillation steps compared to conventional methods, significantly reducing production time and energy consumption while maintaining high purification efficiency.
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 method achieves a significant reduction in HFC-143a content to less than 0.1 mass %, resulting in a highly purified HFO-1132(E) with a purity of 99.9% or more, suitable for refrigerants and other applications.
Implementation Method 1
an extractive distillation step of bringing a composition containing 1, 1,1-trifluoroethane (HFC-143a) and trans-1,2-difluoroethylene (HFO-1132(E)) into contact with a solvent containing an amine
Implementation Method 2
bringing a composition containing HFC-143a and HFO-1132(E) into contact with a solvent containing an amine to obtain a composition having a reduced amount of HFC-143a
Data Source
AI summary
The present disclosure provides a method for efficiently purifying HFO-1132(E). The present disclosure specifically provides a method for producing purified HFO-1132(E), including an extractive distillation step of bringing a composition containing 1,1,1-trifluoroethane (HFC-143a) and trans-1,2-difluoroethylene (HFO-1132(E)) into contact with a solvent containing an amine to obtain a composition having a reduced amount of HFC-143a compared with the original composition.