Supported Gold Catalyst Oxidation of Uronic Acids
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Solution Overview
Problem
Existing methods for producing aldaric acids from uronic acids require basic conditions, leading to the need for additional base addition and salt generation as by-products, which is economically and environmentally undesirable.
Innovation Solution
The process involves the oxidation of uronic acids using a supported gold catalyst at a pH below 7, between 30°C to 100°C, eliminating the need for basic conditions and reducing salt formation by conducting the reaction under neutral to acidic conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If base-free oxidation conditions are used, then salt by-product formation is reduced and downstream processing is simplified, but the oxidation reaction efficiency and selectivity may be compromised
Solution Approach 1:
The patent changes the pH parameter from basic to neutral/acidic conditions, eliminating base addition and preventing salt by-product formation while maintaining oxidation efficiency through catalyst optimization
Solution Approach 2:
The supported gold catalyst acts as an intermediary that enables the oxidation reaction to proceed efficiently under neutral/acidic conditions without requiring base, thereby resolving the contradiction between reaction efficiency and by-product formation
2Productivity
If base is added to the reaction system, then the oxidation reaction proceeds efficiently, but additional salt by-products are generated and downstream processing complexity increases
Solution Approach 1:
The patent changes the pH parameter from basic to neutral/acidic conditions, which eliminates the need for base addition and subsequent salt removal steps, thereby reducing downstream processing complexity while maintaining productivity through catalyst optimization
Solution Approach 2:
The patent extracts the base requirement from the oxidation process by using a supported gold catalyst that enables the reaction to proceed under neutral/acidic conditions, thereby eliminating the source of salt by-products and simplifying 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 efficiently and selectively converts uronic acids to aldaric acids, such as galactaric acid, without the need for additional base addition, reducing downstream processing and by-product formation, and utilizing bio-based uronic acids from sources like sugar beet pulp and seaweeds.
Implementation Method 1
a starting material comprising the uronic acid is subjected to oxygen under the influence of a supported gold catalyst
Implementation Method 2
the oxidation of the corresponding uronic acid, wherein a starting material comprising the uronic acid is subjected to oxygen
Data Source
Figure 1
AI summary
Disclosed is the oxidation of uronic acids, such as galacturonic acid, to the corresponding aldaric acids, such as galactaric acid, under neutral or acidic conditions. Use is made of a supported gold catalyst. The oxidation occurs in good selectivity and yield, under unexpectedly mild conditions. A source of galacturonic acids is pectins, such as from sugar beet pulp.