Solid Acid Catalyst for Glycol Dimethyl Ether Synthesis
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Solution Overview
Problem
Existing methods for preparing ethylene glycol dimethyl ether often result in low yields, generate harmful by-products like 1,4-dioxane, and involve complex reaction processes or harsh conditions, making them environmentally polluting and hazardous.
Innovation Solution
A method involving passing a feedstock containing ethylene glycol monomethyl ether and a carrier gas through a reactor loaded with a solid acid catalyst, such as an acidic molecular sieve or resin, at controlled temperatures (40°C to 150°C) and pressures (0.1 MPa to 15.0 MPa), significantly reducing by-product formation and achieving high selectivity for ethylene glycol dimethyl ether and ethylene glycol.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods (1,2-dichloroethane reacting with methanol or oxidative coupling of dimethyl ether) are used to prepare ethylene glycol dimethyl ether, then the product can be obtained, but the yield is low and harmful by-products like 1,4-dioxane are generated
Solution Approach 1:
The patent changes the reaction parameters by using a solid acid catalyst (such as ion-exchange resin or molecular sieve) and controlling the reaction temperature between 100-200°C, which fundamentally alters the reaction pathway to achieve high selectivity for ethylene glycol dimethyl ether while minimizing harmful by-products like 1,4-dioxane
Solution Approach 2:
The patent introduces a solid acid catalyst as an intermediary substance that mediates the reaction between ethylene oxide and dimethyl ether. The catalyst provides active sites for the reaction, enabling high selectivity and reducing the formation of harmful by-products while maintaining efficient conversion
2Productivity
If oxidative coupling reaction of dimethyl ether is used, then ethylene glycol dimethyl ether can be obtained, but oxygen is added into the reaction system creating safety hazards due to flammability
Solution Approach 1:
The patent replaces the oxidative environment with an inert or non-oxidative reaction environment using a solid acid catalyst. This eliminates the need for oxygen in the reaction system, thereby removing the fire hazard associated with oxidizing flammable substances like dimethyl ether and ethylene glycol dimethyl ether
Solution Approach 2:
Instead of oxidizing dimethyl ether to produce ethylene glycol dimethyl ether (which creates safety hazards), the patent inverts the approach by using ethylene oxide as the starting material and reacting it with dimethyl ether in the presence of a solid acid catalyst, achieving the same product without the safety risks
3Productivity
If reaction temperature is increased to 200°C to 300°C for dehydration reaction, then ethylene glycol dimethyl ether can be produced, but the selectivity is low and multiple by-products are generated
Solution Approach 1:
The patent optimizes the reaction temperature parameter to a moderate range of 100-200°C, which is lower than conventional methods. This temperature optimization, combined with the use of a solid acid catalyst, achieves both high conversion rate and high selectivity for ethylene glycol dimethyl ether, avoiding the formation of multiple by-products that occur at higher temperatures
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 achieves high selectivity for ethylene glycol dimethyl ether and ethylene glycol with minimal production of 1,4-dioxane, reducing environmental pollution and human/animal harm, while maintaining a simple reaction process and avoiding harsh conditions.
Implementation Method 1
passing a feedstock containing a raw material of ethylene glycol monomethyl ether and a carrier gas through a reactor loaded with a solid acid catalyst to produce glycol dimethyl ether and ethylene glycol
Data Source
AI summary
The present invention provides a method for directly preparing glycol dimethyl ether and co-producing ethylene glycol from ethylene glycol monomethyl ether. More specifically, the method comprises passing a feedstock containing a raw material of ethylene glycol monomethyl ether and a carrier gas through a reactor loaded with a solid acid catalyst to produce glycol dimethyl ether and ethylene glycol, at a reaction temperature range from 40°C to 150°C and a reaction pressure range from 0.1 MPa to 15.0 MPa; wherein a carrier gas is an optional inactive gas; and the feedstock contains water whose volume concentration in the feedstock is in a range from 0% to 95%; and the weight hourly space velocity of the raw material of ethylene glycol monomethyl ether is in a range from 0.05h-1 to 5.0h-1; and the volume concentration of the raw material of ethylene glycol monomethyl ether in the feedstock is in a range from 1% to 100%; and the volume concentration of the carrier gas in the feedstock is in a range from 0% to 99%. In the method of the present invention, using a solid acid as a catalyst and ethylene glycol monomethyl ether as a raw material, under a low temperature condition, glycol dimethyl ether and ethylene glycol are prepared directly with high selectivity; moreover, there is substantially or completely no production of by-product 1,4-dioxane that causes pollution to the environment and is harmful to the human body or animal bodies.