TEMPO Organocatalyst Glucose Oxidation for Glucaric Acid

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Solution Overview

Problem

Existing methods for producing glucaric acid, a precursor for bioplastics, face challenges due to the use of harmful reagents like concentrated nitric acid and expensive precious metal catalysts, which are environmentally detrimental and economically unsustainable.

Innovation Solution

A method involving a nitroxide radical-mediated organocatalyst, such as TEMPO acid catalyst, is used to oxidize glucose in a controlled environment with optimal temperature, pH, and oxidizing agent ratios to improve conversion efficiency and stability of glucaric acid.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If concentrated nitric acid is used to oxidize glucose, then glucaric acid can be produced, but environmental harm and equipment corrosion occur

Engineering Contradiction:

Improveglucaric acid productionVSAvoidenvironmental harm and equipment corrosion

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces a nitroxide radical-mediated organocatalyst as an intermediary substance to facilitate the oxidation of glucose to glucaric acid. This catalyst acts as a mediator between glucose and the oxidizing agent (sodium hypochlorite), enabling the reaction to proceed under milder conditions that avoid the harmful effects of concentrated nitric acid while maintaining high conversion efficiency to glucaric acid.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the reaction parameters by using a nitroxide radical organocatalyst system with sodium hypochlorite as the oxidizing agent, operating at controlled temperatures and pH levels. This parameter change replaces the extreme conditions required by concentrated nitric acid with milder conditions that eliminate environmental harm and equipment corrosion while preserving glucaric acid production.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If precious metal catalysts are used to oxidize glucose, then glucaric acid can be produced, but production costs increase

Engineering Contradiction:

Improveglucaric acid productionVSAvoidproduction cost

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The patent replaces expensive precious metal catalysts with a nitroxide radical-mediated organocatalyst system based on readily available organic compounds. This substitution uses cheap, non-precious materials that can be easily synthesized or obtained, dramatically reducing the production cost while maintaining effective catalysis for glucaric acid production from glucose.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The patent creates a functional copy of precious metal catalyst activity using organic nitroxide radicals. The organocatalyst system replicates the catalytic function of precious metals through a different chemical mechanism, achieving the same productivity in glucaric acid production without relying on expensive precious metal resources.

Inventive Principle:

Principle #26Copying

3Productivity

If 5-hydroxymethylfurfural is used as a precursor, then FDCA can be produced, but instability issues occur

Engineering Contradiction:

ImproveFDCA productionVSAvoidraw material stability

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

The patent performs preliminary oxidation of glucose to glucaric acid under controlled conditions using the nitroxide radical catalyst before proceeding to FDCA production. This preliminary action creates a stable intermediate (glucaric acid) that serves as a more stable precursor for FDCA synthesis, avoiding the instability problems associated with using 5-hydroxymethylfurfural directly.

Inventive Principle:

Principle #10Preliminary action

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 enhances the conversion efficiency of glucose to glucaric acid, producing a highly stable product that overcomes the instability issues of existing raw materials, while also reducing environmental impact and costs.

Implementation Method 1

reacting glucose in a solvent through an oxidation reaction using a nitroxide radical-mediated organocatalyst, a co-catalyst, and an oxidizing agent to prepare the glucaric acid or a salt thereof

Methodology Applied

Scientific EffectOxidation: Oxidation

Data Source

PatentUS20250042832A1Method of preparing glucaric acid from glucose using nitroxide radical-mediated organocatalyst and method of separating glucaric acid

Publication Date: 2025.02.06 SEOUL NATIONAL UNIVERSITY R&DB FOUNDATION

AI summary

Proposed is a method of preparing glucaric acid from glucose through TEMPO oxidation. The method of preparing glucaric acid includes (a) reacting glucose in a solvent through an oxidation reaction using 4-acetamido-TEMPO serving as a nitroxide radical-mediated organocatalyst, potassium bromide serving as a co-catalyst, and potassium hypochlorite serving as an oxidizing agent to prepare glucaric acid. The method can improve the conversion efficiency of glucose to glucaric acid through optimal conditions of the temperature, pH, and input of the oxidizing agent in an oxidation reaction using a TEMPO acid catalyst.