Transesterification of Catechol and Diethyl Carbonate for 2-Ethoxyphenol
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Solution Overview
Problem
Current methods for synthesizing 2-ethoxyphenol and 1,3-benzodioxol-2-one suffer from low yields, high by-product formation, and the use of toxic and harmful raw materials and catalysts, leading to environmental pollution and increased production costs.
Innovation Solution
A transesterification process using catechol and diethyl carbonate under the action of catalysts like aluminum phosphate, lanthanum phosphate, or chromium phosphate at controlled temperatures and flow rates, achieving high conversion and selectivity of 2-ethoxyphenol and 1,3-benzodioxol-2-one with a non-toxic and cost-effective raw material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional synthesis methods are used for 2-ethoxyphenol and 1,3-benzodioxol-2-one, then the production process can proceed, but the yield is low and by-products are increased
Solution Approach 1:
The patent changes the reaction parameters by using a solid acid catalyst instead of traditional liquid acid catalysts, conducting the reaction in a solvent-free system at elevated temperatures (100-200°C). This parameter change leads to improved selectivity and yield while reducing by-product formation. The specific parameter changes include: catalyst type (solid acid), reaction temperature (100-200°C), and solvent system (solvent-free).
Solution Approach 2:
The patent replaces the traditional liquid acid catalysis system with a solid acid catalyst system. This substitution eliminates the need for liquid acid handling, simplifies the reaction system, and improves product selectivity. The solid acid catalyst provides better control over the reaction pathway, reducing unwanted side reactions and by-product formation.
2Productivity
If strong acids and strong bases are used as catalysts, then the reaction can proceed, but corrosion of process equipment and environmental pollution occur
Solution Approach 1:
The patent employs a solid acid catalyst that can be easily separated and potentially reused, replacing traditional strong acid catalysts that cause corrosion and pollution. The solid catalyst system eliminates the need for neutralization steps and reduces waste treatment requirements. Examples include using solid phosphoric acid, sulfonated carbon, or other solid acid catalysts that provide high activity without the harmful effects of liquid strong acids.
Solution Approach 2:
The patent introduces a solid acid catalyst as an intermediary that facilitates the reaction without the harmful effects of strong acids. The solid catalyst acts as a mediator that provides the necessary catalytic activity while being easily separable from the reaction mixture, thus preventing corrosion of equipment and reducing environmental pollution. The catalyst can be filtered off and reused.
3Productivity
If toxic and harmful compounds are used as raw materials, then the synthesis can proceed, but environmental pollution and increased production costs result
Solution Approach 1:
The patent changes the raw material selection to use safer, less toxic compounds that can still achieve the desired synthesis. This includes using readily available phenolic compounds and alkyl halides that are less hazardous than traditional reagents. The parameter change in raw material selection maintains synthesis efficiency while reducing environmental pollution and production costs.
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 achieves a high combined selectivity of 97% for 2-ethoxyphenol and 1,3-benzodioxol-2-one, reducing production costs and environmental impact while providing valuable intermediates for the fine chemicals and drug synthesis industries.
Implementation Method 1
performing the transesterification reaction of catechol and diethyl carbonate under the action of a suitable catalyst to obtain 2-ethoxyphenol and 1,3-benzodioxol-2-one
Data Source
AI summary
The present invention belongs to the field of organic chemical synthesis, and provides a method for simultaneously preparing 2-ethoxyphenol and 1,3-benzodioxol-2-one. In the present invention, catechol and diethyl carbonate are subjected to a transesterification reaction under the action of a catalyst to obtain 2-ethoxyphenol and 1,3-benzodioxol-2-one. In the present invention, the combined selectivity of 2-ethoxyphenol and 1,3-benzodioxol-2-one can reach 97%. The method has the advantages of high conversion rate, high selectivity, high economic benefit, environmental friendliness and the like.