Ionic Liquid Composite Catalyst for Ethylene Glycol Production
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Solution Overview
Problem
Current ethylene glycol production processes, such as direct hydration and catalytic hydration, face issues like high water ratios, low selectivity, high energy consumption, and catalyst instability, while the ethylene carbonate process requires separate catalysts for carbonylation and hydrolysis, leading to complex separation processes and high costs.
Innovation Solution
A process using a composite catalyst of hydroxyl functionalized ionic liquids and alkali metal salts for both carbonylation and hydrolysis reactions, allowing for efficient synthesis of ethylene carbonate and subsequent ethylene glycol production under mild conditions, eliminating the need for separate catalysts and simplifying the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate catalysts are used for carbonylation and hydrolysis steps in ethylene carbonate process, then reaction selectivity can be maintained, but device complexity and separation process complexity increase
Solution Approach 1:
The patent combines two separate catalysts (for carbonylation and hydrolysis steps) into a single composite catalyst system. This composite catalyst integrates multiple catalytic functions, allowing both reactions to proceed using one catalyst system, thereby simplifying the separation process and reducing operational complexity while maintaining reaction selectivity.
Solution Approach 2:
The composite catalyst is designed to perform multiple functions - catalyzing both carbonylation and hydrolysis reactions. This multi-functional catalyst eliminates the need for separate catalyst systems, reducing device complexity and separation requirements while preserving the selectivity needed for high-quality ethylene glycol production.
2Productivity
If traditional catalysts are used in ethylene carbonate process, then carbonylation and hydrolysis can be achieved, but catalyst stability and activity are insufficient
Solution Approach 1:
The patent employs a composite catalyst system that combines multiple catalytic components with complementary properties. This composite structure provides both high activity for rapid reaction and enhanced stability for sustained performance, overcoming the limitations of single-component catalysts in the ethylene carbonate process.
3Ease of manufacture
If direct hydration process is used for ethylene glycol production, then process simplicity is maintained, but water ratio and energy consumption increase
Solution Approach 1:
The patent changes the fundamental parameters of the hydration process by introducing a composite catalyst system that enables the reaction to proceed with significantly reduced water ratios. This catalytic approach modifies the reaction pathway, allowing ethylene oxide hydration to occur under conditions that reduce water consumption while maintaining process feasibility.
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 approach achieves high selectivity and efficiency in ethylene glycol production with reduced energy consumption and catalyst separation requirements, providing a cost-effective and environmentally friendly method.
Implementation Method 1
a carbonylation step of reacting EO and CO2 in the presence of an ionic liquid composite catalyst under an aqueous condition to form an aqueous solution containing EC
Implementation Method 2
a hydrolysis step of reacting the reaction solution containing EC and the ionic liquid composite catalyst obtained in Step (a) with water to produce an aqueous solution containing EG
Data Source
AI summary
Disclosed is a process for producing ethylene glycol catalyzed by an ionic liquid, characterized in that the process includes the following three steps: (a) a carbonylation step of ethylene oxide and CO2 catalyzed by an ionic liquid composite catalyst comprising a hydroxyl functionalized ionic liquid and an alkali metal salt under an aqueous condition to produce ethylene carbonate and ethylene glycol; (b) a hydrolysis step of reacting the reaction solution containing ethylene carbonate and the ionic liquid composite catalyst obtained in step (a) with water to produce ethylene glycol; (c) a purification step of dehydrating and refining ethylene glycol from the aqueous solution containing ethylene glycol and the catalyst produced in step (b). The present process has the following advantages: the catalyst has high activity, high suitability, and good stability, the reaction condition is wild, the conversion of ethylene oxide is high, the selectivity of ethylene glycol is high, and the process is simple.