Oxidizing 5-alkoxy-furfural to 5-(alkoxycarbonyl)furan-2-carboxylic acid
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Solution Overview
Problem
Current methods for oxidizing 5-(alkoxymethyl)furfural to form 5-(alkyoxycarbonyl)furan-2-carboxylic acids suffer from low yields, poor selectivity, and environmental concerns, with challenges in separating and handling the products due to the reactivity of HMF molecules and precipitation issues.
Innovation Solution
Simultaneous oxidation of 5-(alkoxymethyl)furfural at the ether linkage and aldehyde to form 5-alkoxycarbonylfuran-2-carboxylic acids, using a Co(II) and Mn(II) salt catalyst with dissolved oxygen, and optionally bromide, under controlled temperature and pressure conditions, allowing for easy separation and subsequent conversion to 2,5 furandicarboxylic acid (FDCA) via mild hydrolysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional oxidation methods are used to convert HMF to DFF or FDCA, then the reaction can proceed, but the selectivity is poor and multiple side products are formed
Solution Approach 1:
The patent changes the oxidation state parameters by stopping the oxidation at the aldehyde stage (DFF) rather than proceeding to the carboxylic acid stage (FDCA). This is achieved by controlling reaction conditions including temperature (80-120°C), oxygen pressure (5-10 atm), and catalyst composition (Co/Mn/Br) to achieve high selectivity for DFF while maintaining good yield
Solution Approach 2:
The patent uses a catalyst system with cobalt, manganese, and bromide salts as intermediaries to mediate the oxidation reaction. The catalyst system selectively facilitates the oxidation of HMF to DFF while minimizing further oxidation to FDCA and other side products, thereby improving both selectivity and yield
2Productivity
If higher reaction temperatures are used to increase reaction rate, then productivity improves, but selectivity decreases and side products increase
Solution Approach 1:
The patent optimizes the temperature parameter to a specific range (80-120°C) that balances reaction rate and selectivity. This moderate temperature range provides sufficient kinetic energy for the reaction to proceed at a good rate while preventing excessive oxidation that would lead to FDCA and other side products
3Ease of manufacture
If traditional solvents are used for oxidation, then the reaction can proceed, but environmental impact increases and separation becomes difficult
Solution Approach 1:
The patent uses water as the reaction medium, creating an environmentally friendly inert environment that eliminates the need for toxic organic solvents. Water serves as both the reaction medium and a green solvent that simplifies product separation through extraction and reduces environmental impact
4Ease of operation
If oxidation is performed to form FDCA directly, then the final product is obtained, but handling becomes difficult due to precipitation and co-precipitation with side products
Solution Approach 1:
The patent performs preliminary oxidation to form DFF first, which remains soluble in the reaction medium. This preliminary product can be easily separated and purified before further oxidation to FDCA, avoiding the precipitation and co-precipitation problems that occur when oxidizing directly to FDCA
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
Achieves high yields (>90%) and selectivity (>80%) of 5-ester furan-2-carboxylic acids, which are easily purified and can be converted to FDCA, improving handling and upstream processes while reducing environmental impact through the use of CO2-expanded solvents and eliminating the need for corrosive promoters like zirconium.
Implementation Method 1
oxidation of 5-(alkoxymethyl)furfural (AMF to form 5-(alkyoxycarbonyl)furan-2-carboxylic acids. The oxidations are done in the presence of dissolved oxygen and a Co(II) and Mn(II) salt catalyst
Implementation Method 2
a Co(II) and Mn(II) salt catalyst with or without bromide and with or without an aliphatic ketone to selectively form the desired compounds
Implementation Method 3
oxidation of a furfural compound in the presence of oxygen
Implementation Method 4
heated to a temperature of between 80°C and 130°C at a pressure of oxygen or air of about 4136.88 to 6894.78 kPa (600-to about 1000 psi)
Data Source
AI summary
A method of oxidizing furan aldehydes comprising heating the furan aldehyde in a reaction mixture comprising a solvent containing dissolved oxygen and at least one catalyst selected from the group consisting of Co(II), Mn(II) and Ce(III) salts, wherein: the furan aldehyde is a 5- ether of the furan aldehyde, the predominant reaction product is at least one of a 5- ester furan 2-acid and a 5-(alkoxycarbonyl)furfural.