Adipic Acid Synthesis via Hydrogen Iodide Reduction
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Solution Overview
Problem
The existing process for producing adipic acid from tetrahydrofuranic substrates requires hydrogen and a hydrodeoxygenation catalyst, which complicates the reaction and leads to catalyst activity loss due to strong acidity, necessitating the development of a catalyst-free method.
Innovation Solution
A process involving the reduction of tetrahydrofuran dicarboxylic acid compounds with hydrogen iodide in an inert atmosphere at elevated temperatures, eliminating the need for a hydrodeoxygenation catalyst and simplifying the reaction by operating without hydrogen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a hydrodeoxygenation catalyst is used in the presence of hydrogen, then the deoxygenation reaction can proceed, but the catalyst activity is reduced due to strong acidity of hydrogen halide and the process becomes complex
Solution Approach 1:
The patent removes the hydrodeoxygenation catalyst from the reaction system, extracting the problematic element that caused complexity and activity loss. The deoxygenation reaction is achieved without any catalyst by using hydrogen halide in an inert atmosphere, eliminating the need for catalyst separation, recovery, and replacement operations.
Solution Approach 2:
The patent replaces the expensive, long-lived but deactivating catalyst with a simple, disposable chemical approach using hydrogen halide. The reaction proceeds without catalyst, and the hydrogen halide can be easily handled and replaced if needed, simplifying the overall process economics and operations.
2Productivity
If a hydrodeoxygenation catalyst is used, then the deoxygenation reaction can occur, but catalyst activity loss occurs due to strong acidity
Solution Approach 1:
The catalyst is completely removed from the system. Instead of trying to protect the catalyst from acid deactivation, the patent achieves deoxygenation through a different mechanism that does not require a catalyst, thereby eliminating the reliability issue of catalyst deactivation entirely.
Solution Approach 2:
The patent changes the reaction parameters by conducting the reaction in an inert atmosphere (nitrogen or carbon dioxide) rather than using hydrogen. This parameter change allows the use of hydrogen halide without catalyst deactivation, maintaining both high reaction efficiency and system reliability.
3Productivity
If hydrogen is present in the reaction, then deoxygenation can occur with catalyst, but separation equipment is needed to separate hydrogen from reaction mixture
Solution Approach 1:
Hydrogen is extracted/removed from the reaction system. The patent achieves deoxygenation using hydrogen halide in an inert atmosphere, completely eliminating the need for hydrogen gas handling, dissolution, and separation equipment. This simplifies the process design and reduces capital investment.
Solution Approach 2:
The patent replaces gaseous hydrogen with a liquid or easily handled hydrogen halide reagent. This substitution eliminates the need for complex gas-liquid contactors, hydrogen dissolution systems, and separation equipment, while maintaining effective deoxygenation conversion.
4Productivity
If hydrogen and catalyst are used, then deoxygenation proceeds, but activity loss and selectivity loss occur over time
Solution Approach 1:
The catalyst is removed from the system, eliminating the issue of gradual activity loss and selectivity degradation. The deoxygenation reaction proceeds without catalyst deactivation, maintaining consistent performance throughout the reaction duration.
Solution Approach 2:
The patent uses a simple chemical reagent system without expensive catalysts that require long service life. The hydrogen halide reagent can be easily replaced if needed, and the process maintains high activity and selectivity without the gradual degradation associated with catalytic systems.
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 approach achieves high yields of adipic acid without catalyst activity loss or selectivity issues, facilitating easier product recovery and process simplification by conducting the reaction in the absence of hydrogen.
Implementation Method 1
a tetrahydrofuran dicarboxylic acid compound is contacted with hydrogen iodide at a temperature of at least 100°C in an inert atmosphere to yield the adipic acid product
Data Source
AI summary
Process for the manufacture of an adipic acid product by a reduction of a tetrahydrofuran dicarboxylic acid compound, wherein the tetrahydrofuran dicarboxylic acid compound is contacted with hydrogen iodide at a temperature of at least 100°C in an inert atmosphere to yield the adipic acid product.