Tire-Derived Carbon Catalyst for FFA Conversion
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Solution Overview
Problem
Existing solid acid catalysts for converting free fatty acids to fatty acid methyl esters face issues such as environmental pollution, equipment corrosion, and reduced activity due to leaching of catalytically active sites, particularly when using sulfuric acid and other harmful chemicals.
Innovation Solution
A porous carbon composite impregnated with a salt, specifically ferric sulfate, is used as a catalyst, where the carbon composite is derived from waste tires and sulfonated rubber, providing a sustainable and effective means for converting free fatty acids to fatty acid methyl esters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sulfuric acid is used to convert free fatty acids to fatty acid methyl esters, then the conversion efficiency is improved, but environmental pollution and equipment corrosion occur
Solution Approach 1:
The patent introduces a solid acid catalyst as an intermediary substance that enables the conversion of free fatty acids to fatty acid methyl esters without requiring direct contact with harmful sulfuric acid. The solid acid catalyst performs the same chemical function while eliminating the harmful side effects of liquid sulfuric acid, thus resolving the contradiction between conversion efficiency and environmental harm.
Solution Approach 2:
The patent replaces the liquid-phase sulfuric acid system with a solid-phase acid catalyst system. This substitution changes the physical state and handling characteristics of the catalyst, eliminating issues related to liquid acid corrosion and environmental pollution while maintaining catalytic activity for FFA conversion.
2Productivity
If conventional solid acid catalysts are used, then FFA to FAME conversion is achieved, but catalytic activity decreases due to leaching of active acid sites
Solution Approach 1:
The patent employs a porous carbon support material with controlled pore structure to host the acid catalytic sites. The porous structure provides a large surface area for catalyst dispersion and creates a confined environment that anchors the active sites, preventing their leaching into the reaction mixture while maintaining high catalytic activity for FFA conversion.
Solution Approach 2:
The patent creates a composite catalyst system combining carbon support material with acid functional groups. This composite structure integrates the advantages of both components: the carbon provides structural stability and porosity, while the acid groups provide catalytic activity. The strong interaction between the carbon support and acid sites prevents leaching and enhances catalyst reliability.
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 catalyst efficiently converts free fatty acids to fatty acid methyl esters, even in the presence of water and triglycerides, with high activity and stability, minimizing environmental impact and equipment corrosion, and maintaining catalytic performance through multiple reaction cycles.
Implementation Method 1
A porous carbon composite impregnated with a salt, specifically ferric sulfate, is used as a catalyst, where the carbon composite is derived from waste tires and sulfonated rubber, providing a sustainable and effective means for converting free fatty acids to fatty acid methyl esters.
Data Source
AI summary
The invention provides a catalyst and a method for making the catalyst. The catalyst comprises a porous carbon composite impregnated with a salt. The catalyst comprises a porous carbon composite impregnated with a salt.