Ionic Liquid Heterogeneous Catalyst for EMC Transesterification
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Solution Overview
Problem
Current methods for synthesizing ethyl methyl carbonate (EMC) face challenges such as low catalytic activity, long reaction times, and high temperatures due to the use of ionic liquids with weak alkalinity and poor stability, leading to inefficient production and environmental concerns from soluble strong alkali residues.
Innovation Solution
Development of a new ionic liquid with strong alkalinity and high stability, embedded in a silica, titanium dioxide, or aluminum oxide framework, which exhibits high catalytic activity at lower temperatures and maintains activity even after multiple uses, replacing traditional soluble strong alkalis like sodium hydroxide or potassium hydroxide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If traditional soluble strong alkalis (sodium hydroxide or potassium hydroxide) are used as catalysts, then high catalytic activity is achieved, but the catalyst is sensitive to water, easy to inactivate, generates salt inactivation products that are insoluble in carbonate, and causes environmental pollution
Solution Approach 1:
The patent changes the physical and chemical parameters of the catalyst by transitioning from soluble strong alkalis to ionic liquids with strong alkalinity. The ionic liquid catalyst maintains high catalytic activity while improving stability through its unique structure that prevents decomposition and inactivation. This parameter change resolves the contradiction between high activity and stability.
Solution Approach 2:
The patent uses composite ionic liquid structures combining cations and anions with specific properties. The ionic liquid consists of organic cations (such as imidazolium, pyridinium, or morpholinium) and anions (such as hydroxide, alkoxide, or carboxylate) that work together to provide both high catalytic activity and enhanced stability, resolving the contradiction between activity and reliability.
2Reliability
If ionic liquids with weak alkalinity are used as catalysts, then stability is improved, but catalytic activity decreases and reaction time increases
Solution Approach 1:
The patent changes the alkalinity parameter of the ionic liquid catalyst from weak to strong by selecting specific anion combinations (hydroxide, alkoxide, carboxylate). This parameter change enables the catalyst to maintain both high stability and high catalytic activity, achieving fast reaction rates and short reaction times while preserving reliability.
3Power
If homogeneous catalysts are used, then high catalytic activity is achieved, but product separation becomes difficult and catalyst reuse is not feasible
Solution Approach 1:
The patent changes the physical state parameter of the catalyst from homogeneous (soluble) to heterogeneous (immiscible) by using ionic liquids that form a separate phase. This parameter change allows the catalyst to maintain high activity while enabling easy separation through phase separation, making the manufacturing process simpler and catalyst reuse feasible.
4Power
If soluble strong alkalis are used, then high catalytic activity is achieved, but salt residues reduce product purity and cause environmental pollution
Solution Approach 1:
The patent changes the chemical composition parameter by replacing soluble strong alkalis with ionic liquid catalysts. The ionic liquid catalyst does not form insoluble salt inactivation products, eliminating contamination of the product with salt residues. This results in high product purity while maintaining the ionic liquid catalyst in the reaction system for potential reuse.
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 new ionic liquid-based heterogeneous catalyst achieves high-purity EMC synthesis with reaction equilibrium reached in 5 minutes at 76-78°C, showing stable catalytic activity for up to 20 cycles without significant degradation, and can be directly applied to transesterification without baking, improving industrial feasibility.
Implementation Method 1
a heterogeneous catalyst comprising an ionic liquid and a support which embeds the ionic liquid in a riveting manner
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The present disclosure discloses a homogeneous catalyst comprising an ionic liquid with an anion and a cation, wherein the anion and the cation both comprises a nitrogen-containing heterocycle, wherein the cation has a structure represented by Formula I or Formula II, and the anion has a structure represented by Formula III, Formula IV or Formula V. The present disclosure further provides a heterogeneous catalyst comprising the homogeneous catalyst, a preparation method and use of the homogeneous catalyst and the heterogeneous catalyst. The homogeneous catalyst and heterogeneous catalyst are used to synthesize high-purity ethyl methyl carbonate product by the transesterification of dimethyl carbonate and ethanol, transesterification of dimethyl carbonate and diethyl carbonate, or transesterification of methanol and diethyl carbonate, and exhibit high reaction activity wherein a reaction equilibrium can be reached when the reaction time is 5 min and the reaction temperature is in a range from 76°C to 78°C, and the both catalysts show high catalytic activity even at near room temperature 30°C. The synthesized ionic liquids exhibit substantially unchanged catalytic activity and show higher stability, even after reused 20 times.