FDCA Electrolysis With Bismuth Electrode for Green Adipic Acid
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Solution Overview
Problem
The production of Nylon 6,6 monomers, such as 2-hydroxyadpic acid (HAA) and adipic acid (AA), is energy-intensive, uses non-renewable crude oil-derived feedstocks, and involves the release of environmentally harmful chemicals, posing challenges for environmental sustainability.
Innovation Solution
A method involving the electrolysis of 2,5-furandicarboxylic acid (FDCA) using a bismuth electrode in a sulfuric acid solution with a quaternary ammonium salt (QAS) at ambient conditions, enabling simultaneous ring-opening and hydrogenation to produce HAA and AA without high-temperature and high-pressure requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional oxidation processes are used to produce adipic acid from cyclohexane, then adipic acid can be synthesized, but high energy consumption and release of environmentally harmful chemicals occur
Solution Approach 1:
The invention converts the harmful nitric acid oxidation process into a beneficial electrochemical reduction process. Instead of using corrosive nitric acid that releases N2O greenhouse gas, the patent uses electrochemical reduction of FDCA in aqueous solution, transforming a harmful chemical process into an environmentally friendly one that produces H2O as the only byproduct.
Solution Approach 2:
The invention fundamentally changes the reaction parameters from high-temperature oxidation to ambient-temperature electrochemical reduction. The process operates at room temperature and atmospheric pressure, eliminating the need for high energy input and harmful oxidants, while using electricity as the clean energy source.
2Productivity
If high temperature and pressure conditions are used for monomer synthesis, then reaction efficiency is improved, but energy consumption increases significantly
Solution Approach 1:
The invention replaces the mechanical/thermal system (high temperature and pressure) with an electrochemical system. Instead of using thermal energy to drive the reaction, the patent uses electrical energy to drive electrochemical reduction at ambient conditions, eliminating the need for high temperature and pressure equipment.
Solution Approach 2:
The invention changes the operating parameters from extreme conditions (high T and P) to mild conditions (ambient T and P). The electrochemical reduction proceeds efficiently at room temperature and atmospheric pressure, fundamentally altering the energy landscape of the synthesis process.
3Manufacturing precision
If precious metal catalysts are used to achieve high selectivity, then product quality is improved, but manufacturing cost increases
Solution Approach 1:
The invention replaces expensive precious metal catalysts with a disposable or regenerable bismuth-based electrode. The bismuth electrode provides the necessary catalytic activity for selective ring-opening reduction at a fraction of the cost of precious metals, and can be easily replaced or regenerated without complex procedures.
Solution Approach 2:
The bismuth electrode acts as an intermediary that facilitates the selective electrochemical reduction of FDCA to HAA and AA. The bismuth surface provides specific adsorption sites that enable selective bond cleavage and hydrogenation, achieving high product selectivity without requiring precious metal catalysts.
4Productivity
If conventional chemical agents are used for ring-opening and hydrogenation, then reaction proceeds efficiently, but harmful chemical use and waste generation occur
Solution Approach 1:
The invention enables the system to serve itself by using electrons from the power source and protons from water as the reducing agents. The electrochemical cell directly reduces FDCA using electrical energy and water, eliminating the need for external chemical reducing agents and their associated waste streams. The only byproduct is hydrogen gas, which can be collected or vented safely.
Solution Approach 2:
The invention converts the harmful chemical reduction process into a beneficial electrochemical reduction process. Instead of using stoichiometric amounts of chemical reducing agents that generate waste, the patent uses electricity and water to generate reducing equivalents in situ, with H2O as the sole byproduct.
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 method reduces energy consumption, eliminates the need for precious metal catalysts, and avoids harmful chemical use, making it a green, low-carbon industrial process for producing Nylon 6,6 monomers.
Implementation Method 1
electrolysis of 2,5-furandicarboxylic acid (2-3 mM) using a bismuth electrode at a constant current in a sulfuric acid solution containing a quaternary ammonium salt
Implementation Method 2
simultaneous ring-opening and hydrogenation of 2,5-furandicarboxylic acid to synthesize 2-hydroxyadipic acid
Data Source
AI summary
A method of preparing 2-hydroxyadpic acid and adipic acid is provided. The method of preparing 2-hydroxyadpic acid and adipic acid comprises a step of the electrolysis of 2,5-furandicarboxylic acid using a metal electrode at a constant current in a sulfuric acid solution containing a quaternary ammonium salt. The metal electrode is a bismuth electrode or a lead electrode. The quaternary ammonium salt is represented by formula (I):wherein R1 to R4 are independently a C2-5 hydrocarbon group, and X− is ClO4−, H2PO4−, or Br−.