Titanium-Containing Silicon Oxide Catalyst for High-Yield Epoxide
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Solution Overview
Problem
Existing methods for producing epoxide from olefin and hydroperoxide using titanium-containing silicon oxide catalysts do not achieve high yields.
Innovation Solution
A titanium-containing silicon oxide is produced with specific pore size, pore volume, and salt concentration conditions, using a quaternary ammonium ion as a template agent and adjusting salt content, followed by silylation and titanium introduction steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional titanium-containing silicon oxide catalysts are used for epoxide production, then the catalytic reaction can proceed, but the epoxide yield is low
Solution Approach 1:
The patent applies parameter changes by precisely controlling the salt concentration ratio (S/Ti) between 0.004 to 10, adjusting the pore size distribution with 80% or more of pores in the 5-200 Å range, and optimizing the total pore volume to 0.2 cm³/g or more. These parameter optimizations transform the catalyst properties to achieve high epoxide yield while maintaining reliable catalytic efficiency
Solution Approach 2:
The patent utilizes porous materials by designing a titanium-containing silicon oxide catalyst with specific pore structure characteristics: average pore size of 10 Å or more, total pore volume of 0.2 cm³/g or more, and 80% or more of pores within 5-200 Å range. This porous structure enhances reactant accessibility and catalytic activity, resolving the contradiction between productivity and reliability
2Productivity
If the pore size and pore volume of titanium-containing silicon oxide are not optimized, then the catalyst structure is simple, but the epoxide production yield is low
Solution Approach 1:
The patent optimizes specific parameters of the catalyst structure including pore size distribution (80% or more of pores with 5-200 Å), total pore volume (0.2 cm³/g or more), and salt concentration ratio (0.004 to 10). By precisely controlling these parameters rather than increasing overall structural complexity, the patent achieves high epoxide yield while maintaining a relatively simple catalyst system
3Productivity
If the salt concentration is not controlled within the specific ratio, then the catalyst preparation is simpler, but the epoxide production efficiency is reduced
Solution Approach 1:
The patent establishes a specific parameter range for salt concentration ratio (S/Ti between 0.004 to 10) that optimizes epoxide yield. While this requires controlled preparation, the patent simplifies the overall manufacturing process by using straightforward salt addition and removal steps, achieving high productivity without excessive manufacturing complexity
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 enables high-yield production of epoxide from olefin and hydroperoxide, with the titanium-containing silicon oxide serving as an effective catalyst.
Implementation Method 1
obtained by using a quaternary ammonium ion represented by formula I as a template agent and thereafter removing the template agent by a solvent extraction operation
Implementation Method 2
contacting the solid obtained in the template agent removing step with a silylating agent to obtain a solid including a silylated silicon oxide
Implementation Method 3
introducing titanium into the system
Implementation Method 4
introducing titanium into the system
Implementation Method 5
introducing or removing a salt S or a precursor thereof into the system to adjust a molar concentration of the salt S or a precursor thereof
Data Source
AI summary
A method for producing an epoxide using a titanium-containing silicon oxide catalyst that includes a salt at a predetermined concentration.