Purifying Crude FDCA via Mild Hydrogenation and Purge Zone
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Solution Overview
Problem
The existing methods for purifying crude furan 2,5-dicarboxylic acid (FDCA) are energy-intensive and consume large amounts of hydrogen, making it necessary to develop a more efficient process for reducing color bodies and mono-carboxylic acid impurities like 5-formyl furan-2-carboxylic acid (FFCA) without high energy consumption.
Innovation Solution
A process involving mild catalytic hydrogenation under controlled temperature (130° C. to 225° C.) and hydrogen partial pressure (10 psi to 900 psi) in the presence of a hydrogenation catalyst, where the crude FDCA is dissolved in a hydrogenation solvent, and the displaced oxidation solvent is purged to produce a purified FDCA product with reduced FFCA and color impurities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional hydrogenation treatment is used to purify crude FDCA, then color bodies and FFCA are effectively removed, but energy consumption and hydrogen usage increase significantly
Solution Approach 1:
The patent changes the reaction parameters by conducting hydrogenation at lower temperatures (80-150°C) and lower hydrogen partial pressures (1-50 atm) compared to conventional methods, thereby reducing energy consumption and hydrogen usage while maintaining effective purification of FDCA
Solution Approach 2:
The patent introduces a solvent system (water, alcohol, or carboxylic acid) as an intermediary medium to dissolve crude FDCA before hydrogenation, enabling the reaction to proceed under milder conditions and reducing the energy and hydrogen requirements for purification
2Manufacturing precision
If conventional hydrogenation treatment is used to purify crude FDCA, then color bodies and FFCA are effectively removed, but hydrogen consumption increases significantly
Solution Approach 1:
The patent changes the reaction parameters by conducting hydrogenation at lower temperatures (80-150°C) and lower hydrogen partial pressures (1-50 atm) compared to conventional methods, thereby reducing energy consumption and hydrogen usage while maintaining effective purification of FDCA
Solution Approach 2:
The patent introduces a solvent system (water, alcohol, or carboxylic acid) as an intermediary medium to dissolve crude FDCA before hydrogenation, enabling the reaction to proceed under milder conditions and reducing the energy and hydrogen requirements for purification
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 process effectively reduces FFCA and color impurities in FDCA while minimizing energy consumption and hydrogen usage, achieving a high yield of purified FDCA with improved polymer viscosity and color stability.
Implementation Method 1
hydrogenation in the presence of a hydrogenation catalyst
Implementation Method 2
hydrogenating the solvated FDCA composition to thereby reduce the color bodies and FFCA present
Data Source
AI summary
A process for purifying a crude furan 2,5-dicarboxylic acid composition (cFDCA) by hydrogenation of a FDCA composition dissolved in a hydrogenation solvent such as water, and hydrogenating under mild conditions, such as at a temperature within a range of 130° C. to 225° C. by contacting the solvated FDCA composition with hydrogen in the presence of a hydrogenation catalyst under a hydrogen partial pressure within a range of 10 psi to 900 psi.