Continuous Ethylene Glycol Conversion Using Low Retro-Aldol Catalyst
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Solution Overview
Problem
Existing processes for converting aldohexose-yielding carbohydrates to ethylene glycol using retro-aldol and hydrogenation catalysts face challenges such as high catalyst usage costs, reactor volume requirements, and inefficiencies in achieving high selectivity and throughput, leading to economic and operational complexities.
Innovation Solution
The use of very low concentrations of homogeneous tungsten-containing retro-aldol catalyst in combination with heterogeneous nickel-containing hydrogenation catalysts, supported on low surface area inert supports, along with controlled hydrogenation activity, to achieve high selectivity and throughput in a continuous process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high concentrations of retro-aldol catalyst are used to achieve high conversion rates, then productivity increases, but catalyst usage costs and fouling increase
Solution Approach 1:
The patent changes the concentration parameter of the retro-aldol catalyst from conventional high levels (typically 1-10% or higher) to very low levels (0.01-1%), which fundamentally alters the process economics and operational characteristics while maintaining high productivity through optimized reaction conditions
2Reliability
If high concentrations of retro-aldol catalyst are used to maintain stable operations, then reliability improves, but catalyst fouling and operational complexity increase
Solution Approach 1:
By changing the catalyst concentration parameter to very low levels and adjusting related process parameters (temperature, residence time, catalyst type), the patent achieves stable continuous operation with minimal fouling, eliminating the need for frequent catalyst replacement or reactor cleaning
3Productivity
If high throughput is implemented to minimize capital costs, then device complexity reduces, but catalyst usage and fouling increase
Solution Approach 1:
The patent implements high throughput operation (e.g., substrate concentration rates of 0.1-10 kg/L/hr) combined with very low catalyst concentrations, achieving high productivity while minimizing catalyst consumption and fouling through optimized reaction kinetics and mass transfer conditions
4Manufacturing precision
If conventional catalyst concentrations are used to achieve high selectivity, then manufacturing precision improves, but catalyst usage costs increase
Solution Approach 1:
By changing to very low catalyst concentrations (0.01-1%) and optimizing other process parameters (temperature, pressure, residence time, catalyst formulation), the patent achieves high selectivity to ethylene glycol (typically >80%) while dramatically reducing catalyst usage costs
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 enables high selectivity to ethylene glycol with reduced catalyst usage, minimizing fouling and hydrogen starvation, thereby improving the economic viability and operational stability of commercial-scale facilities.
Implementation Method 1
the carbohydrate is converted over a retro-aldol catalyst to intermediates, and then the intermediates are then catalytically converted over a hydrogenation catalyst to ethylene glycol and/or propylene glycol
Implementation Method 2
the glycol aldehyde is hydrogenated to ethylene glycol
Data Source
AI summary
Retro-aldol processes are disclosed that use very low concentrations of retro-aldol catalyst in combination with hydrogenation catalyst of certain activities, sizes and spatial dispersions to obtain the high selectivities to ethylene glycol.