Acidic EMT Zeolite Catalyst for Dimethyl Ether Carbonylation
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Solution Overview
Problem
Current methods for producing ethanol from coal using syngas are costly due to the need for precious catalysts like rhodium and require high-cost, special alloy devices, while alternative routes using dimethyl ether carbonylation face issues with catalyst deactivation and low activity, making them unsuitable for industrial production.
Innovation Solution
A method employing an acidic EMT zeolite molecular sieve catalyst with specific silicon-to-aluminum ratios and optional metal promoters for carbonylation of dimethyl ether to produce methyl acetate, which can be further hydrogenated to ethanol, improving reaction activity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dimethyl ether carbonylation is used to produce methyl acetate, then the route provides a new application prospect for ethanol production, but the catalyst activity is very low and catalyst deactivation occurs
Solution Approach 1:
The patent modifies the catalyst's chemical composition parameters by incorporating specific metal elements (Cu, Zn, Mn, Co, Ni, Mo, W, or their combinations) into the molecular sieve structure, and adjusts the Si/Al ratio to optimize acidity. These parameter changes enhance both the initial activity and long-term stability of the catalyst for dimethyl ether carbonylation
Solution Approach 2:
The patent creates composite catalyst materials by combining molecular sieve supports with multiple metal promoters (Cu-Zn-Al, Cu-Mn-Al, Co-Mo-Al, etc.). This composite structure synergistically improves catalyst activity, selectivity, and resistance to deactivation, solving both the low activity and stability issues
2Productivity
If traditional syngas route using rhodium catalyst is used to produce ethanol, then the conversion efficiency is high, but the catalyst cost is relatively high and rhodium output is limited
Solution Approach 1:
The patent replaces expensive precious metal rhodium catalysts with cheaper alternative catalysts based on molecular sieves promoted by abundant metals like Cu, Zn, Mn, Co, Ni, Mo, or W. Although these catalysts have shorter lifetimes than rhodium, their low cost and high activity make them economically viable for large-scale ethanol production
3Reliability
If liquid phase methanol carbonylation route is used to produce acetic acid, then the route is mature, but the device needed to be made of special alloy which is anticorrosive, so the cost is high
Solution Approach 1:
The patent extracts the carbonylation reaction step from the traditional liquid-phase methanol carbonylation process and applies it to dimethyl ether instead. This modification eliminates the need for corrosion-resistant special alloy equipment while maintaining route maturity and reliability, significantly reducing device cost
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 method significantly enhances the activity and stability of the carbonylation reaction, meeting industrial production requirements with improved selectivity and longevity of the catalyst, thus providing a cost-effective route for producing ethanol.
Implementation Method 1
a method for producing methyl acetate by carbonylation of dimethyl ether in the presence of a catalyst containing an acidic EMT zeolite molecular sieve
Data Source
AI summary
The present invention provides a method for producing a light fatty acid alkyl ester with the formula of R1-COO-R2, and the method comprises a step in which a alkyl ether with formula of R1-O-R2 and a raw gas containing carbon monoxide go through a reactor loaded with a catalyst for carrying out a carbonylation reaction; wherein the catalyst contains an acidic EMT zeolite molecular sieve; wherein R1 and R2 are independently selected from C1-C4 alkyl groups. The present invention has provided a new method for producing light fatty acid alkyl ester. In the method of the present invention, the carbonylation is carried out in the presence of the catalyst containing the acidic EMT zeolite molecular sieve, and the reaction activity is high, and the stability has been significantly improved, meeting the requirement of industrial production.