Methylphenol Homologue Production via Low-Carbon Cross-Coupling Aromatization
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Solution Overview
Problem
Current methods for producing methylphenol and homologues are inefficient, costly, and environmentally harmful, relying on petroleum-based raw materials and high temperatures, leading to low selectivity and by-product issues.
Innovation Solution
A catalytic conversion process using low carbon molecules methanol, ethanol, and acetone at low temperatures (≤300°C) through dehydrogenation-cross coupling-aromatization with a hydroxyphosphate catalyst, producing methylphenol and homologues in a single step, reducing pollution and enabling easy product separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If isopropyltoluene oxidation method is used to produce methylphenol, then industrial production capability is achieved, but selectivity is reduced due to formation of resinous substances and consumption of target product
Solution Approach 1:
The invention changes the fundamental reaction parameters by switching from oxidation of arene materials to cross-coupling-aromatization of low carbon molecules. This parameter change eliminates the formation of resinous substances and improves selectivity to 34.0% for methylphenol and 7.1% for 2,3,6-trimethylphenol while maintaining industrial production capability
Solution Approach 2:
The invention introduces a specific catalyst system (hydroxyphosphate or hydroxyphosphate modified by transition metal) as an intermediary to enable the cross-coupling-aromatization reaction. This catalyst mediator facilitates the conversion of methanol, ethanol, and acetone to methylphenol homologues with high selectivity, avoiding the by-product issues of conventional oxidation methods
2Quantity of substance
If two-step reaction route is used for methylation of cresol to produce high carbon phenol, then high carbon phenol is obtained, but production cost increases
Solution Approach 1:
The invention merges multiple reaction steps into a single cross-coupling-aromatization step. By combining the methylation and phenol formation reactions into one process using methanol, ethanol, and acetone as co-reactants, the invention eliminates the need for separate cresol production and methylation steps, thereby reducing production cost while maintaining high carbon phenol output
Solution Approach 2:
The invention segments the reaction pathway by using low carbon molecules (methanol, ethanol, acetone) as separate reactant components that independently contribute to the formation of methylphenol homologues. This segmentation allows for flexible raw material selection and cost optimization while achieving the desired high carbon phenol products
3Quantity of substance
If high temperature (400-450°C) is used for ethanol conversion to phenolic products, then phenolic products are obtained, but alkene by-products are formed in large numbers
Solution Approach 1:
The invention changes the temperature parameter from high temperature (400-450°C) to low temperature (≤300°C). This parameter change fundamentally alters the reaction pathway to cross-coupling-aromatization, which produces phenolic products with minimal alkene by-products and enables easy product separation
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
Achieves high selectivity of methylphenol (34.0%) and 2,3,6-trimethylphenol (7.1%), with by-products usable as fuel additives, offering a sustainable and cost-effective alternative.
Implementation Method 1
A preparation method for methylphenol and homologue comprises the following steps: Under the conditions of reaction temperature of 150-350° C. and reaction pressure of 1-50 atm, a mixed material of methanol, ethanol and acetone is fed into a reactor containing a catalyst by a carrier gas at the total flow of the reaction gas of 20-200 mL/min to produce methylphenol through coupling-aromatization reaction.
Implementation Method 2
A preparation method for methylphenol and homologue from low carbon micromolecules through dehydrogenation-cross coupling-aromatization reaction
Implementation Method 3
A preparation method for methylphenol and homologue from low carbon micromolecules through dehydrogenation-cross coupling-aromatization reaction
Implementation Method 4
A preparation method for methylphenol and homologue from low carbon micromolecules through dehydrogenation-cross coupling-aromatization reaction
Data Source
AI summary
A preparation method for methylphenol and homologue. Under the conditions of reaction temperature of 150-350° C. and reaction pressure of 1-50 atm, a mixed material of methanol, ethanol and acetone is fed into a reactor containing a catalyst by a carrier gas to produce methylphenol through coupling-aromatization reaction. The method provides a reaction path for directly producing methylphenol and homologue from low carbon micromolecular alcohol and ketone through coupling-aromatization reaction, the maximum selectivity of total cresol is 34.0%, and the selectivity of 2,3,6-trimethylphenol is up to 7.1%. The by-product hydrogen of the reaction path can be used as a chemical material. Other by-products such as high carbon alcohol and ketone whose melting and boiling points are quite different from those of methylphenol and which are easy to be separated by rectification can be used as fuel additives to partially replace petroleum-based products.