Aromatic Carbonate Synthesis via Aliphatic Intermediate
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Solution Overview
Problem
Current methods for preparing aromatic carbonates using carbon dioxide as a carbonyl source face challenges such as generation of by-products, inclusion of impurities, use of expensive catalysts, and complex processes, while also requiring regeneration of organometallic compounds for recycling.
Innovation Solution
A method involving the reaction of an organometallic compound with carbon dioxide to form an aliphatic carbonate, which is then reacted with an aromatic alcohol to produce an aromatic carbonate, utilizing organometallic compounds with a metal-oxygen-carbon bond, such as tetra-n-butoxy titanium or dibutyltin butoxide, under controlled temperature and pressure conditions to achieve high yield without the need for additional catalysts or separation processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If carbon dioxide is used as a carbonyl source to prepare aromatic carbonate, then environmental friendliness and safety are improved, but by-products are generated and manufacturing precision deteriorates
Solution Approach 1:
The patent extracts and removes by-products (aliphatic alcohol and unreacted carbon dioxide) from the reaction system through distillation and phase separation, achieving high product purity while maintaining the use of safe carbon dioxide as carbonyl source
Solution Approach 2:
The patent optimizes reaction parameters including temperature (60-150°C), pressure (1-30 atm), and molar ratios to maximize aromatic carbonate yield and minimize by-product formation, achieving both safety and manufacturing precision
2Productivity
If expensive catalysts are used to improve reaction efficiency, then productivity is improved, but manufacturing cost increases
Solution Approach 1:
The patent employs inexpensive catalysts such as metal phenoxides that can be easily prepared and disposed of, replacing expensive traditional catalysts while maintaining acceptable reaction efficiency and reducing overall manufacturing cost
Solution Approach 2:
The patent optimizes catalyst loading amounts and reaction conditions to achieve high conversion rates with minimal catalyst usage, improving productivity without requiring expensive catalytic systems
3Productivity
If complex pretreatment processes are applied to prepare metal phenoxide catalysts, then catalyst activity is improved, but device complexity and operation difficulty increase
Solution Approach 1:
The patent utilizes the aromatic alcohol reactant itself to generate the metal phenoxide catalyst in situ through a simple mixing process, eliminating the need for complex external pretreatment steps while maintaining catalyst activity
Solution Approach 2:
The patent combines the catalyst preparation and main reaction steps into a single integrated process, where metal phenoxide is generated in situ from metal salt and aromatic alcohol, simplifying the overall操作流程
4Productivity
If organometallic compounds are used and require regeneration for recycling, then catalyst reusability is improved, but process complexity and time consumption increase
Solution Approach 1:
The patent accepts single-use or limited-use catalysts that do not require regeneration, simplifying the process by eliminating regeneration steps while maintaining economic viability through low catalyst cost and high reaction efficiency
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 method enables the economic preparation of aromatic carbonates in high yield using carbon dioxide as a carbonyl source, simplifying the process and avoiding the costs associated with expensive catalysts and complex regeneration steps, while maintaining high efficiency and selectivity.
Implementation Method 1
preparing a reaction mixture containing an aliphatic carbonate by reacting an organometallic compound with carbon dioxide
Implementation Method 2
preparing an aromatic carbonate by reacting the reaction mixture with an aromatic alcohol
Data Source
AI summary
A method for preparing an aromatic carbonate, of the present invention, comprises the steps of: (A) preparing a reaction mixture containing an aliphatic carbonate by reacting an organometallic compound and carbon dioxide; and (B) preparing an aromatic carbonate by reacting the reaction mixture and an aromatic alcohol. The method for preparing an aromatic carbonate allows an aromatic carbonate to be economically prepared in a high yield by using carbon dioxide as a carbonyl supply source.