Progressive Emulsion Crystallization for Organic Purification
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current emulsion crystallization methods face challenges in achieving high yields, efficient separation of related impurities, and large-scale production of pure organic molecules, especially when dealing with crude materials containing impurities with similar structures, due to issues like low emulsion stability, long crystallization times, and high surfactant content.
Innovation Solution
The Progressive Emulsion Crystallization (PEC) process, which involves forming emulsions with a Gibbs free energy of droplet formation ΔG > 0, using a homogenization system to control suspension, and optimizing cooling ramps for crystallization, allows for efficient purification of organic molecules by seeding at higher temperatures and controlling the crystallization temperature to produce large particles with good filtration properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If emulsion crystallization is used to purify organic molecules, then separation of impurities is achieved, but crystallization time becomes excessively long
Solution Approach 1:
The patent applies preliminary action by pre-forming stable emulsion droplets with controlled size distribution before the crystallization process. The emulsion is prepared with optimal surfactant concentration and droplet size (0.1-10 μm) in advance, which provides a ready-made template for crystal formation. This preliminary preparation eliminates the need for slow in-situ emulsion formation during crystallization, thereby reducing overall process time while maintaining high purity separation.
2Stability of the object's composition
If surfactant is added to form stable emulsion, then emulsion stability is improved, but amount of surfactant required increases
Solution Approach 1:
The patent applies parameter changes by optimizing the surfactant concentration to a specific range (0.1-5% w/v) and controlling droplet size (0.1-10 μm) to achieve maximum emulsion stability with minimal surfactant. The invention identifies critical parameters such as surfactant type (ionic vs. nonionic), concentration, and droplet size distribution, and adjusts these parameters to find the optimal balance between stability and surfactant usage. This allows achieving stable emulsion with lower surfactant amounts compared to conventional methods.
3Manufacturing precision
If emulsion is cooled to low temperature for crystallization, then purity of crystals is improved, but filtration difficulty increases due to small particle size
Solution Approach 1:
The patent applies preliminary action by pre-establishing a stable emulsion matrix with controlled droplet size before crystallization. The emulsion droplets act as pre-formed templates that guide crystal growth, ensuring that crystals form within or on the surface of droplets of optimal size. This preliminary structuring prevents the formation of excessively fine crystals that would be difficult to filter, while still allowing high purity separation through the emulsion matrix.
Solution Approach 2:
The patent applies flexible shells and thin films by utilizing the emulsion droplet interface (stabilized by surfactant) as a flexible template for crystal growth. The surfactant film at the droplet interface provides a controlled environment that guides crystal nucleation and growth, allowing crystals to form with optimal size and morphology. This interface acts as a flexible template that can accommodate different crystal sizes while maintaining the benefits of emulsion crystallization.
4Productivity
If seeding is performed at low temperature to promote crystallization, then crystallization speed is improved, but risk of impurity crystallization increases
Solution Approach 1:
The patent applies local quality by creating different local environments within the emulsion system. The emulsion droplets provide localized zones with controlled composition, size, and surface properties that favor selective crystallization of the desired compound. By controlling droplet size distribution and surfactant type, the invention creates local conditions that promote preferential nucleation and growth of target crystals over impurity crystals, even at temperatures where both might otherwise crystallize.
Solution Approach 2:
The patent applies intermediary (mediator) by using the emulsion droplet interface and surfactant molecules as intermediaries that mediate between the bulk solution and the crystallizing molecules. The surfactant at the droplet interface acts as a mediator that selectively interacts with the target compound, promoting its crystallization while excluding impurities. This intermediary layer provides selectivity that prevents impurity crystallization even at lower temperatures where seeding is performed.
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
PEC achieves high yields and effective separation of impurities, suitable for large-scale industrial production with minimal surfactant use, producing highly pure products with improved filtration properties.
Implementation Method 1
emulsions with a Gibbs free energy of droplet formation ΔG > 0
Implementation Method 2
dissolving the aggregate mixture at higher temperatures, cooling the emulsion to lower temperature and gaining a high level of super saturation
Implementation Method 3
seeding is used to promote crystallization
Implementation Method 4
seeding with crystals of the pure substance is carried out at a higher temperature than the temperature at which the crystallization is completed
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention described herein is in the field of separation processes, more particularly, in the field of selective crystallization methods for purification of organic substances.