Lignin Antioxidant Production via Mild Oxidative Depolymerization
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Solution Overview
Problem
Current methods for obtaining antioxidant compositions from lignin derivatives face challenges due to high temperature-pressure conditions, leading to high capital/operating costs and variability in antioxidant properties, making industrial applications difficult.
Innovation Solution
A method involving mild depolymerization of lignin or black liquor under alkaline conditions at temperatures above 160°C with an oxidizing agent, such as oxygen, at a partial pressure below 0.3 MPa, which activates lignin and functionalizes it, resulting in a high-antioxidant activity composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If classical depolymerization processes operate at high temperature-pressure conditions, then depolymerization efficiency is improved, but capital and operating costs increase significantly
Solution Approach 1:
The patent changes the reaction parameters from high temperature-pressure conditions to milder conditions by introducing an oxidizing agent, which enables depolymerization to proceed efficiently without requiring extreme thermal and pressure conditions, thus reducing equipment requirements and operational costs
Solution Approach 2:
The patent introduces an oxidizing agent as an intermediary substance that facilitates the depolymerization reaction. This mediator enables the breakdown of lignin at milder conditions by providing an alternative reaction pathway that does not require high energy input, thereby reducing the need for expensive high-pressure equipment
2Reliability
If lignin derivatives are used as antioxidants, then antioxidant properties are obtained, but variability in antioxidant properties makes industrial application difficult
Solution Approach 1:
The patent applies parameter changes by controlling the oxidation process conditions (temperature, pressure, oxidizing agent concentration) to produce lignin derivatives with consistent and reproducible antioxidant properties, reducing batch-to-batch variability and making the process suitable for industrial scale-up
Solution Approach 2:
The patent employs feedback control by monitoring the oxidation process parameters and adjusting them to maintain optimal conditions, ensuring consistent product quality and antioxidant activity across different production batches, which is essential for industrial application
3Productivity
If high temperature-pressure conditions are used for depolymerization, then depolymerization is achieved, but the process becomes less suitable for large-scale industrial applications
Solution Approach 1:
The patent replaces the mechanical/thermal system (high temperature and pressure) with a chemical system (oxidizing agent-mediated depolymerization). This substitution allows the reaction to proceed at milder conditions that are easier to control and scale up industrially, while maintaining effective depolymerization rates
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
The method produces an antioxidant composition with enhanced radical scavenging activity and phenolic content, surpassing commercial antioxidants like BHT, with reduced nitrogen and sulfur levels, suitable for various industrial applications.
Implementation Method 1
contacting the lignin, lignin liquor or black liquor with an oxidizing agent, wherein said contacting is carried out in alkaline conditions and at a temperature above 160° C.
Implementation Method 2
said contacting is carried out in alkaline conditions
Data Source
AI summary
The invention relates to a method for producing an antioxidant composition from lignin, lignin liquor or black liquor which comprises contacting the lignin, lignin liquor or black liquor with an oxidizing agent, wherein said contacting is carried out in alkaline conditions and at a temperature above 160° C., wherein when the oxidizing agent is oxygen, a gas mixture comprising oxygen or an oxygen-generating compound or composition, then the agent is added so that the oxygen partial pressure is below 0.3 MPa. The invention also relates to the antioxidant composition obtained by the method of the invention and to the uses thereof.