Magnesium-Modified TS-1 Catalyst for Ketoxime Synthesis
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Solution Overview
Problem
Current methods for producing ketoximes, such as the hydroxyl ammonium method, result in complex processes, high equipment costs, and low yields with significant environmental impact due to the production of detrimental byproducts, and existing catalysts like TS-1 molecular sieves have poor selectivity and conversion rates.
Innovation Solution
A method using a magnesium-containing titanium-silicon molecular sieve as a catalyst for the ammoxidation of ketones, with a specific chemical formula (MgxTiySi)Oz, where x and y are within defined ranges, and a molar ratio of oxidant to ketone and nitrogen-containing compound optimized for high selectivity and yield, employing hydrogen peroxide as the oxidant and operating under controlled temperature and pressure conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the hydroxyl ammonium method is used to produce butanone oxime, then the production process is established and reliable, but the process becomes complex, equipment cost increases, and detrimental ammonium salts are produced as byproducts
Solution Approach 1:
The invention extracts and eliminates the problematic ammonium salt byproduct formation step from the traditional hydroxyl ammonium method. By replacing the hydroxyl ammonium reagent with a catalytic system using TS-1 molecular sieve and hydrogen peroxide, the harmful byproduct generation is removed while maintaining the core oxime synthesis function.
Solution Approach 2:
The invention changes the chemical parameters of the reaction system by substituting the hydroxyl ammonium reagent with a catalyst-based system. The use of TS-1 molecular sieve catalyst and hydrogen peroxide oxidant fundamentally alters the reaction pathway, eliminating ammonium salt formation while achieving the same oxime production objective.
2Reliability
If the hydroxyl ammonium method is used to produce butanone oxime, then the production process is established and reliable, but high equipment cost and environmental harm are incurred
Solution Approach 1:
The invention converts the harmful ammonium salt byproduct into a beneficial outcome by completely eliminating its formation. The catalytic system using TS-1 molecular sieve and hydrogen peroxide transforms the reaction pathway to produce only water as a byproduct, turning a potentially harmful process into an environmentally benign one.
3Device complexity
If a TS-1 molecular sieve is used to catalyze oxidation to prepare linear ketoximes, then the process is simplified, but the yield of ketoximes is poor
Solution Approach 1:
The invention applies local quality modification by introducing magnesium ions at specific locations within the TS-1 molecular sieve structure. This localized modification of the catalyst's active sites enhances its catalytic activity and selectivity for ketoxime formation, thereby improving yield without complicating the overall process.
4Manufacturing precision
If a noble metal is added to modify a TS-1 catalyst for ammoxidation of butanone, then the selectivity of butanone oxime increases to 90%, but the conversion rate of butanone is at most 10%
Solution Approach 1:
The invention replaces expensive noble metal modifiers with a more economical approach using magnesium-containing TS-1 molecular sieve. This cost-effective catalyst modification achieves both high selectivity and high conversion rate, eliminating the need for precious metals while maintaining catalytic performance.
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 product selectivity, conversion rates, and yield of ketoximes, making it suitable for industrial use with a simpler process and reduced environmental impact.
Implementation Method 1
performing a reaction of a nitrogen-containing compound, ketone and an oxidant by using a titanium-silicon molecular sieve of formula (I) as a catalyst, so as to form the ketoxime
Implementation Method 2
The oxidant is hydrogen peroxide
Data Source
AI summary
A method for producing a ketoxime is provided. The method includes the step of performing a reaction of a nitrogen-containing compound, ketone and an oxidant by using a titanium-silicon molecular sieve as a catalyst, so as to form the ketoxime, thereby increasing the yield and selectivity of the ketoxime.