Heterogeneous Gold Catalyst for Base-Free Methyl Methacrylate Production
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Solution Overview
Problem
Current methods for producing methyl methacrylate from methacrolein and methanol using heterogeneous catalysts with noble metals are not optimized, lacking an efficient process that does not require a base and ensures safe operation.
Innovation Solution
A method involving a heterogeneous catalyst with gold as the noble metal, supported on γ-, δ-, or θ-alumina, where the catalyst has a specific size and distribution of noble metal in the outer region, used in an oxidative esterification reactor with methacrolein and methanol, ensuring no base is added, and operating within specific temperature and pressure conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a heterogeneous catalyst with noble metal is used for producing methyl methacrylate, then catalytic activity is improved, but process complexity and safety risks increase due to base addition requirements and flammable headspaces
Solution Approach 1:
The patent extracts and eliminates the base component from the traditional production process. By using a heterogeneous catalyst with noble metal supported on metal oxide, the process no longer requires base addition for the esterification reaction, thereby reducing process complexity and eliminating associated safety risks while maintaining high productivity
Solution Approach 2:
The patent creates an inherently safer reaction environment by using a heterogeneous catalyst system that does not require base addition, thereby eliminating the formation of flammable headspaces. The metal oxide support provides a stable, inert environment that prevents hazardous conditions while maintaining catalytic activity
2Productivity
If base is added to the reactor for oxidative esterification, then reaction efficiency is improved, but safety risks increase due to formation of flammable headspaces
Solution Approach 1:
The patent removes the base component from the reaction system entirely. The heterogeneous catalyst with noble metal on metal oxide support enables oxidative esterification to proceed efficiently without base addition, thereby eliminating the formation of flammable headspaces while maintaining high reaction efficiency
Solution Approach 2:
The patent converts the potential harm of base addition (which creates flammable headspaces) into a benefit by developing a base-free catalytic system. The heterogeneous catalyst achieves superior results by eliminating the harmful aspect while preserving and even enhancing the beneficial reaction efficiency
3Productivity
If catalyst particle size is reduced to increase surface area, then catalytic activity is improved, but pressure drop across the reactor increases
Solution Approach 1:
The patent optimizes the catalyst particle size parameter to achieve a balance between surface area and pressure drop. By selecting specific particle size ranges for the heterogeneous catalyst, the process maintains sufficient catalytic activity while minimizing excessive pressure drop across the reactor bed
Solution Approach 2:
The patent uses a composite catalyst structure with noble metal dispersed on metal oxide support. This composite architecture provides high surface area and active sites for catalysis while the support structure maintains appropriate mechanical properties and pore distribution to limit pressure drop
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 effectively produces methyl methacrylate with high yield and safety by optimizing catalyst composition and reactor conditions, enhancing process efficiency and safety by avoiding flammable headspaces.
Implementation Method 1
contacting a mixture comprising methacrolein, methanol and oxygen with a heterogeneous catalyst comprising a support and a noble metal in a reactor
Implementation Method 2
oxidative esterification of methacrolein
Data Source
AI summary
A method for preparing methyl methacrylate from methacrolein and methanol. The method comprises contacting a mixture comprising methacrolein, methanol and oxygen with a heterogeneous catalyst comprising a support and a noble metal; wherein said catalyst has an average diameter of at least 200 microns and average concentration of methacrolein is at least 15 wt%.