Depolymerized Lignin Antioxidant for Biodiesel Stability
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Solution Overview
Problem
Biodiesel is sensitive to oxidation due to its composition of fatty acid methyl esters, requiring antioxidants, but existing commercial antioxidants are often derived from fossil materials, necessitating a biobased alternative.
Innovation Solution
Depolymerizing lignin to create a stabilization agent with a weight average molecular weight between 360 g/mol and 5000 g/mol, reducing its TEAC value by up to 50% to enhance its antioxidant capacity and solubility in biodiesel, thereby forming a biobased stabilization agent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If commercial antioxidants are used in biodiesel, then oxidation stability is improved, but the biobased content is reduced due to fossil material origin
Solution Approach 1:
The patent changes the molecular weight parameter of lignin through controlled depolymerization, reducing it from high molecular weight (insoluble) to low molecular weight (360-5000 g/mol, soluble). This parameter change enables the lignin to function as an effective antioxidant in biodiesel while maintaining 100% biobased content, resolving the contradiction between oxidation stability and biobased content
Solution Approach 2:
The patent uses lignin, a waste byproduct from paper and pulp industries, as the antioxidant source. By converting this low-value waste material into a high-value antioxidant through depolymerization, the invention achieves both cost-effectiveness and 100% biobased content while improving oxidation stability
2Adaptability or versatility
If high molecular weight lignin is used, then biobased content is maintained, but solubility and antioxidant capacity in biodiesel are reduced
Solution Approach 1:
The patent applies parameter change by controlling the molecular weight of lignin through depolymerization conditions (temperature, time, catalyst). By optimizing these parameters, the lignin molecular weight is reduced to 360-5000 g/mol, which simultaneously improves solubility in biodiesel and enhances antioxidant capacity while maintaining 100% biobased content
Solution Approach 2:
The patent segments the high molecular weight lignin polymer chains into smaller oligomeric units through depolymerization. This segmentation increases the number of phenolic hydroxyl groups available per unit mass and improves solubility, enabling the lignin to effectively scavenge free radicals in biodiesel while maintaining biobased content
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 depolymerized lignin effectively increases the antioxidant potential, allowing it to inhibit oxidation in biodiesel compositions, enabling the production of a fully biobased biodiesel with reduced CO2 emissions and improved stability.
Implementation Method 1
subjecting the lignin to a depolymerization process to obtain depolymerized lignin having a weight average molecular weight of at least 360 g/mol and at most 5000 g/mol
Implementation Method 2
Biodiesel is sensitive to oxidation reactions... the TEAC value of the depolymerized lignin is at most 50 % of the TEAC value of a corresponding lignin before having been depolymerized
Data Source
AI summary
A biodiesel composition comprising a stabilization agent is disclosed. The stabilization agent comprises depolymerized lignin having a weight average molecular weight of at least 360 g/mol and at most 5000 g/mol, and the TEAC value of the depolymerized lignin is at most 50 % of the TEAC value of a corresponding lignin bfore having been depolymerized, and wherein the weight average molecular weight of the depolymerized lignin is at most 60 % of the weight average molecular weight of the corresponding lignin.