Muconic Compound Conversion for Low-Side-Product Levulinic Acid
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Solution Overview
Problem
Current production methods for levulinic acid suffer from low yields, formation of undesirable side-products, and require extensive downstream processing, particularly due to the use of mineral acids and high sensitivity to reaction parameters.
Innovation Solution
A process involving a reaction mixture of a polar protic solvent and a muconic compound, heated to at least 120°C and autogenic pressure, which includes muconic acid, muconate salt, or mucono(lactone), producing levulinic acid, levulinate ester, or salt thereof, with reduced side-products and easier separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If mineral acids are used for levulinic acid production from sugars, then the reaction can proceed, but side products like formic acid and char are formed requiring extensive separation and disposal
Solution Approach 1:
The patent changes the chemical parameter by replacing mineral acids with organic acids (acetic acid, propionic acid, butyric acid) as catalysts. This substitution fundamentally alters the reaction pathway to avoid formation of harmful side products like formic acid and char, while maintaining reaction feasibility for levulinic acid production from sugars
Solution Approach 2:
The patent employs readily available organic acids as catalysts that can be easily handled and disposed of compared to mineral acids. These organic acid catalysts provide the necessary catalytic activity without creating persistent harmful byproducts, simplifying the overall process and reducing environmental burden
2Productivity
If mineral acids and elevated temperatures are used, then levulinic acid production rate increases, but corrosion resistance requirements increase
Solution Approach 1:
The patent replaces corrosive mineral acids with non-corrosive organic acids as catalysts. This substitution allows the use of standard, non-specialized equipment without requiring expensive corrosion-resistant materials, while maintaining effective catalytic activity for levulinic acid production at elevated temperatures
3Productivity
If reaction parameters are varied to improve yield, then levulinic acid production increases, but process sensitivity increases
Solution Approach 1:
The patent changes the catalyst type from mineral acid to organic acid, which fundamentally improves process stability. The organic acid catalysts provide a more tolerant reaction environment where yield is less sensitive to variations in temperature, time, and concentration parameters, enabling more reliable and reproducible levulinic acid production
4Manufacturing precision
If extensive downstream processing is implemented to separate side products, then product purity increases, but process complexity increases
Solution Approach 1:
The patent extracts or eliminates the problematic side product formation step by using organic acid catalysts instead of mineral acids. This prevention approach at the source avoids the need for complex downstream separation processes, as the reaction inherently produces minimal side products that require separation
Solution Approach 2:
The patent converts the potentially harmful mineral acid-catalyzed reaction pathway into a beneficial organic acid-catalyzed pathway. This transformation eliminates the formation of harmful side products like formic acid and char, turning a problematic process into a clean, simple reaction that requires minimal downstream processing
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 achieves higher yields of levulinic acid and esters with minimal side-products, using environmentally friendly solvents like water, and produces CO2 as the only byproduct, facilitating easy separation and reducing the need for corrosion-resistant reactors.
Implementation Method 1
heating the reaction mixture provided at step a) at a temperature Ti of at least about 120°C and at a pressure Pi higher or equal to the autogenic pressure
Implementation Method 2
at a pressure Pi higher or equal to the autogenic pressure
Implementation Method 3
providing a reaction mixture, either homogeneous or heterogeneous, comprising: a polar protic solvent; and a muconic compound
Data Source
Figure 1
AI summary
The present invention relates to the field of organic synthesis, and in particular, the present invention pertains to a process for preparing a levulinic acid or salt thereof, or levulinate.