FDME Crystallization Purification for Color-Stable Biobased Monomers
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Solution Overview
Problem
Existing methods for purifying biobased monomers like 2,5-furandicarboxylic acid, dimethyl ester (FDME) face challenges such as equipment fouling, color development, low yields, and the need for high-temperature distillation, which can lead to thermal degradation and impurity formation.
Innovation Solution
Alternative purification methods involving solvent crystallization and aqueous-organic extraction are employed, using specific solvents and solid treatment media to selectively crystallize FDME, avoiding high temperatures and improving purity and color stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If distillation is used to purify FDME, then purity is improved, but equipment fouling and color development occur
Solution Approach 1:
The patent changes the purification parameter from thermal distillation to crystallization at lower temperatures. This parameter change avoids the high temperature conditions that cause equipment fouling and color development, while still achieving high purity FDME through selective crystallization from the solvent system
Solution Approach 2:
The patent replaces the mechanical/thermal distillation system with a crystallization system based on solubility differences. Instead of using heat and phase change from liquid to vapor, the process uses temperature-controlled crystallization from solution, eliminating the harmful effects of high temperature distillation
2Manufacturing precision
If multiple purification steps are used, then purity is improved, but process complexity increases
Solution Approach 1:
The patent combines multiple purification functions into a single crystallization step. The crystallization process simultaneously achieves separation from impurities, concentration of FDME, and purification, replacing what would traditionally require multiple separate steps such as distillation, filtration, and drying
Solution Approach 2:
The patent extracts FDME from the crude composition through selective crystallization. By using a specific solvent system and temperature control, the process extracts pure FDME crystals from the mixture, leaving impurities in the mother liquor, thereby achieving purification in a single extraction-like operation
3Manufacturing precision
If traditional purification methods are used, then some purity is achieved, but yield is reduced due to losses
Solution Approach 1:
The patent optimizes crystallization parameters including temperature profile, solvent composition, and cooling rate to maximize both purity and yield. By carefully controlling these parameters, the process achieves high purity crystals while minimizing FDME remaining in the mother liquor, thus reducing substance loss
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 methods achieve high-purity, colorless FDME with enhanced stability, high yield, and simplified processing, reducing impurities to very low levels, suitable for producing high-quality biobased polymers.
Implementation Method 1
dissolving the crude composition in a non-methanol solvent to form a solution of the crude composition
Implementation Method 2
crystallizing, from the solution of the crude composition, a purified composition having an increased content of FDME
Implementation Method 3
crystallizing, from the solution of the crude composition, a purified composition
Implementation Method 4
forming a biphasic solution of the crude composition in a solvent comprising an organic phase and a separate aqueous phase
Implementation Method 5
separating the organic phase from the aqueous phase
Data Source
AI summary
Methods are disclosed for the purification of crude compositions comprising 2,5-furandicarboxylic acid, dimethyl ester (FDME) or other diester derivatives (e.g., dialkyl ester derivatives) of 2,5-furandicarboxylic acid (FDCA), by crystallization. In this regard, certain solvents, and classes of solvents, have been discovered to promote the selective crystallization of FDME over impurities often generated in its production by FDCA esterification and other upstream processing steps. Importantly, certain impurities that are selectively removed include those that would otherwise be detrimental to the color and/or color stability of the purified composition. Other improvements in crystallization reside in the use of techniques such as liquid-liquid extraction and pre-treatment of the crystallization solution by contact with a solid medium.