Selenium-Based Catalyst System for Dialkyl Carbonate Synthesis
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Solution Overview
Problem
Existing carbonylation processes for producing dialkyl carbonates face challenges such as low yield, by-product generation, and catalyst corrosion, particularly with copper-based catalysts, and lack economically feasible methods using CO2 as a raw material.
Innovation Solution
A selenium-based catalyst system incorporating selenium (Se) and a pyridine amine compound like 4-dimethylaminopyridine (DMAP), with specific molar ratios and promoters like diphenyl diselenide, is used for oxidative carbonylation of alcohol to produce carbonate derivatives like bis(2-methoxyethyl) carbonate, maintaining activity even upon reuse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If copper-based catalysts (CuCl, CuCl2) are used for oxidative carbonylation, then the process can be commercialized and proceed, but catalyst corrosion occurs and activity/selectivity need improvement
Solution Approach 1:
The patent changes the chemical composition parameter of the catalyst system from copper-based to selenium-based, combined with specific promoters (diphenyl diselenide, dimethyl diselenide) and bases (DMAP, triethylamine). This parameter change eliminates the corrosion issue inherent to copper-based catalysts while maintaining catalytic activity for oxidative carbonylation of alcohols to dialkyl carbonates.
Solution Approach 2:
The patent creates a composite catalyst system comprising selenium, organic promoters (diphenyl diselenide or dimethyl diselenide), and organic bases (DMAP or triethylamine). This composite approach combines multiple components with complementary functions: selenium provides catalytic activity, promoters enhance stability and prevent deactivation, and bases facilitate the reaction mechanism, collectively solving the corrosion and activity problems of single-component copper catalysts.
2Productivity
If existing catalyst systems are used, then carbonylation can proceed, but activity and selectivity need improvement
Solution Approach 1:
The patent introduces organic promoters (diphenyl diselenide or dimethyl diselenide) as intermediaries that mediate between the selenium catalyst and the alcohol substrate. These promoters form reactive selenium species in situ that enhance both the activity and selectivity of the catalytic system, enabling efficient conversion to dialkyl carbonates with minimal by-products.
Solution Approach 2:
The patent optimizes the molar ratio parameter of selenium to promoter to base (specifically DMAP) within the range of 1:1:3 to 1:5:15. This parameter optimization ensures maximum catalytic activity and selectivity by balancing the concentrations of active selenium species, promoter molecules, and base catalysts in the reaction system.
3Ease of manufacture
If carboxylation with CO2 is used to synthesize DAC, then environmental and economic benefits are achieved, but by-product generation and complicated processes occur
Solution Approach 1:
The patent extracts and eliminates the problematic carboxylation pathway with CO2 and replaces it with oxidative carbonylation using carbon monoxide. This extraction of the problematic reaction route removes the associated by-product generation and process complexity while maintaining the environmental and economic benefits of producing dialkyl carbonates through a simplified oxidative carbonylation mechanism.
4Productivity
If copper-based catalysts are used, then oxidative carbonylation can proceed, but catalyst recovery is difficult
Solution Approach 1:
The patent employs selenium-based catalysts combined with organic promoters and bases that operate effectively in homogeneous phase but can be easily separated from the product mixture through simple filtration or extraction. The catalyst system is designed to be disposable or easily replaceable, eliminating the complex recovery and regeneration processes required for heterogeneous copper catalysts while maintaining high catalytic activity throughout the reaction.
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 selenium-based catalyst system achieves high yields of dialkyl carbonates economically and feasibly, avoiding catalyst corrosion issues and maintaining activity over multiple uses, outperforming existing copper-based systems.
Implementation Method 1
a catalyst system for preparing a carbonate derivative, the catalyst system containing selenium (Se); and a pyridine amine compound
Implementation Method 2
by performing an oxidative carbonylation process of alcohol using a selenium-based catalyst system
Data Source
AI summary
The present invention relates to a catalyst system for preparing a carbonate derivative, comprising selenium (Se) and a pyridine amine compound represented by structural formula 1. The catalyst system for preparing a carbonate derivative, and a method for preparing a carbonate derivative by using same, of the present invention, allow an alcohol to undergo oxidative carbonylation by using a selenium-based catalyst system, and thus are more economical than a conventional carbonylation process and can obtain a dialkyl carbonate in feasible yields.