Glycerol Hydrogenation Selectivity via Copper Catalyst
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Solution Overview
Problem
Current processes for producing 1,2-propanediol from glycerol-containing streams are inefficient in terms of selectivity and energy consumption, particularly when dealing with industrial-scale glycerol streams from biodiesel production, which often have high water content and impurities.
Innovation Solution
A process involving the hydrogenation of glycerol-containing streams with a copper-containing heterogeneous catalyst at temperatures between 100 to 320°C and pressures of 100 to 325 bar, with optional pretreatment steps to reduce water content and remove impurities, is employed to achieve high selectivity and yield of 1,2-propanediol.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional hydrogenation processes are used on industrial glycerol streams, then the process can handle high water content streams, but the selectivity and energy efficiency are poor
Solution Approach 1:
The patent applies parameter changes by optimizing the copper catalyst composition (specific ratios of CuO, ZnO, and Al2O3), controlling reaction temperature (200-300°C range), and adjusting pressure conditions to achieve high selectivity for 1,2-propanediol while maintaining the ability to process streams with up to 30% water content. This resolves the contradiction by finding optimal parameter values that satisfy both adaptability and manufacturing precision requirements.
2Productivity
If pretreatment steps are added to remove impurities and reduce water content, then the hydrogenation efficiency improves, but the process complexity increases
Solution Approach 1:
The patent converts the harmful effect of water and impurities in industrial glycerol streams into a beneficial outcome by designing a copper-based catalyst system that is specifically tolerant to these contaminants. The catalyst maintains high activity and selectivity even with up to 30% water content, eliminating the need for complex pretreatment steps while achieving high hydrogenation efficiency. This resolves the contradiction by making the harmful factors (water, impurities) compatible with the process rather than requiring their removal.
3Speed
If higher temperatures and pressures are used in hydrogenation, then the reaction rate increases, but the energy consumption increases
Solution Approach 1:
The patent optimizes the energy parameters by establishing a balanced temperature range (200-300°C) and pressure range (50-300 bar) that achieves high reaction rates while minimizing energy consumption. The specific copper catalyst composition enhances reaction activity, allowing the process to operate at lower temperatures and pressures compared to conventional methods, thus resolving the contradiction between reaction speed and energy usage.
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 enables the production of 1,2-propanediol with high selectivity and efficiency, even from streams with up to 30% water content, making it suitable for industrial-scale glycerol streams, thereby optimizing energy use and product yield.
Implementation Method 1
the glycerol-containing stream is subjected to a hydrogenation in the presence of a copper-containing, heterogeneous catalyst
Implementation Method 2
a glycerol-containing stream is subjected to a hydrogenation
Data Source
AI summary
The present invention relates to a process for the preparation of 1,2-propanediol, in which a glycerol-containing stream, in particular a stream obtained on an industrial scale in the production of biodiesel, is subjected to a hydrogenation.