Ionic Liquid Purification of Organic Materials
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Solution Overview
Problem
Conventional vacuum sublimation purification processes for organic materials in organic electroluminescence (EL) devices face issues such as contamination by carrier gases, low yield, scattering of samples during venting, and increased energy consumption, which reduce the final purity and efficiency of the purification process.
Innovation Solution
A method and apparatus using ionic liquids to sublimate organic materials, capturing the sublimated gas with flowing ionic liquids to dissolve and recrystallize the organic material, thereby separating impurities and achieving high purity without the need for reverse sublimation, utilizing blades and recirculation to enhance purification efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If vacuum sublimation purification process is used, then purity of organic material is improved, but contamination by carrier gases occurs
Solution Approach 1:
The patent extracts and removes the harmful carrier gas from the purification system by using a cold trap to condense and collect the sublimated organic material directly without carrier gas exposure, thereby eliminating contamination while maintaining high purity
Solution Approach 2:
The patent introduces a cold trap as an intermediary component between the sublimation chamber and the collection chamber, which captures the sublimated material and prevents direct contact with carrier gases, thus resolving the contradiction between purification and contamination
2Manufacturing precision
If vacuum sublimation purification process is used, then purity of organic material is improved, but yield is reduced
Solution Approach 1:
The patent implements continuous sublimation and condensation cycles where the cold trap continuously captures sublimated material and the system operates without interruption, maximizing yield while maintaining purity through sustained purification action
Solution Approach 2:
The patent recovers the sublimated organic material in the cold trap rather than discarding it, and the system is designed to collect and retain all sublimated material, thereby maximizing yield while achieving high purity through the sublimation process
3Manufacturing precision
If conventional sublimation process is used, then purification is achieved, but energy consumption increases
Solution Approach 1:
The patent divides the system into distinct functional zones (sublimation chamber, cold trap, collection chamber) with localized temperature control, allowing energy to be applied only where needed for sublimation while the cold trap passively condenses material, reducing overall energy consumption compared to conventional uniform heating
Solution Approach 2:
The patent utilizes the phase transition of the organic material from solid to gas during sublimation and from gas to solid during condensation in the cold trap, achieving purification through these natural phase changes rather than requiring continuous high-energy heating throughout the system
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
This approach significantly increases the purity of organic materials to 99.95% or higher, reduces contamination, and enhances the yield to 95% or more, while also allowing for the reuse of ionic liquids, thus lowering costs and improving the environmental sustainability of the process.
Implementation Method 1
heating the organic material including an impurity to a sublimation point to generate a sublimated gas of the organic material
Implementation Method 2
bringing the sublimated gas of the organic material into contact with the flowing ionic liquid to thus capture and dissolve the organic material
Implementation Method 3
recrystallizing the organic material... the sublimated gas, which is captured in the ionic liquid to be dissolved, to thus generate the recrystallized organic material
Data Source
AI summary
A method of purifying an organic material using an ionic liquid according to the present invention includes a sublimation step (S510) of sublimating the organic material containing an impurity, a capturing step (S520) of bringing a sublimated gas of the organic material into contact with the flowing ionic liquid to capture the sublimated gas, and a recrystallization step (S530) of preferentially oversaturating the organic material, which is to be purified, of the sublimated gas, which is captured in the ionic liquid to be dissolved, to thus generate the recrystallized organic material. In the present invention, it is not necessary to perform a process of carrying the sublimated gas, which is generated during the sublimation step, to implement reverse sublimation. Accordingly, there is a merit in that the contamination of a purified sample by an inert carrier gas, which is used in a conventional sublimation purification method, is fundamentally avoided.