Lignin Conversion to 2,5-Dimethylphenol via Sepiolite Catalyst
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Solution Overview
Problem
Current methods for synthesizing 2,5-dimethylphenol consume fossil raw materials, cause environmental pollution, and result in equipment corrosion, while also failing to effectively utilize lignin as a sustainable resource.
Innovation Solution
A method involving the selective catalytic conversion of lignin using a catalyst comprising a modified sepiolite carrier with active metals Mo, Zr, and Fe, under supercritical ethanol conditions, followed by cooling, separation, and extraction to produce 2,5-dimethylphenol.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If conventional methods (sulfonation and alkali fusion, nitrification reduction, direct catalytic hydroxylation) are used to synthesize 2,5-dimethylphenol, then 2,5-dimethylphenol can be produced, but fossil raw materials are consumed, environmental pollution occurs, and equipment corrosion is severe
Solution Approach 1:
The patent changes the chemical parameters of the reaction system by using supercritical ethanol as a solvent and introducing a specific catalyst system (Mo/Zr/Fe on sepiolite), transforming the conventional synthesis pathway into a catalytic conversion of lignin that eliminates fossil raw material consumption and reduces harmful emissions
Solution Approach 2:
The patent employs a composite catalyst material consisting of Mo/Zr/Fe metals supported on sepiolite carrier, which combines the catalytic activity of transition metals with the structural stability and eco-friendliness of natural clay, achieving high selectivity for 2,5-dimethylphenol while avoiding equipment corrosion
2Ease of manufacture
If lignin is directly discharged as a by-product in the pulp and paper industry, then production is simplified, but serious waste of resources and environmental pollution occurs
Solution Approach 1:
The patent extracts and utilizes the valuable phenolic monomers from lignin through catalytic conversion, transforming waste lignin into useful chemicals (2,5-dimethylphenol and other monomers), thereby eliminating resource waste while maintaining production simplicity
Solution Approach 2:
The patent introduces a catalytic system as an intermediary that facilitates the conversion of lignin into valuable phenolic monomers, enabling the transformation of waste material into useful products without complicating the overall production process
3Adaptability or versatility
If lignin is converted to single-molecule aryl compounds through catalytic means, then fossil product substitutes are achieved, but the complex three-dimensional network structure must be broken down
Solution Approach 1:
The patent segments the complex lignin macromolecule into single-molecule aryl compounds through controlled catalytic bond breaking, transforming the three-dimensional network structure into useful monomeric units while maintaining sustainability
Solution Approach 2:
The patent applies local quality modification by using a specific catalyst system (Mo/Zr/Fe on sepiolite) that selectively targets certain bonds in the lignin structure, enabling controlled degradation of the complex network into desired monomers with high selectivity
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 process achieves high lignin conversion rates and selectivity for 2,5-dimethylphenol monomers, using a green and recyclable catalyst that avoids equipment corrosion and environmental pollution, establishing a 'carbon neutral' raw material system.
Implementation Method 1
Lignin can be converted to single-molecule aryl compounds by catalytic means
Implementation Method 2
a catalytic conversion reaction of lignin is carried out under the gaseous supercritical conditions of ethanol
Implementation Method 3
After the reaction, the mixture is subjected to cooling by quenching
Data Source
AI summary
The present disclosure discloses a method for preparing 2,5-dimethylphenol by selective catalytic conversion of lignin, relates to the technical field of chemistry, and includes the following steps: mixing lignin, a catalyst, and ethanol, and then carrying out a catalytic conversion reaction of lignin under the gaseous supercritical conditions of ethanol; and cooling the reaction product by quenching after the completion of reaction, and then subjecting it to separation and extraction to obtain 2,5-dimethylphenol. The catalyst comprises a modified sepiolite carrier, an active metal Mo, and auxiliary agents Zr and Fe. The process of the present disclosure is simple, and the prepared catalyst is a solid catalyst, which avoids problems of difficult recovery, serious environmental pollution and equipment corrosion caused by the use of homogeneous organic acid-base catalysts.