Ti-Si Molecular Sieve Catalyst for Dimethyl Sulfoxide Selectivity
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Solution Overview
Problem
Current methods for producing dimethyl sulfoxide have limitations in selectivity, conversion efficiency, and oxidant utilization, requiring improvements for more effective and scalable processes.
Innovation Solution
A continuous process involving the reaction of hydrogen sulfide with methanol to produce dimethyl sulfide, followed by contact with an oxidant in the presence of a Ti—Si molecular sieve catalyst, optimizing reaction conditions for high conversion and selectivity in a catalytic distillation reactor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional oxidation methods (nitrogen dioxide or oxygen gas) are used to oxidize dimethyl sulfide, then dimethyl sulfoxide can be produced, but the selectivity is low and byproducts are generated requiring vacuum distillation for purification
Solution Approach 1:
The patent changes the oxidation parameters by using hydrogen peroxide as the oxidant instead of conventional nitrogen dioxide or oxygen gas, and employs a Ti-Si molecular sieve catalyst to modify the reaction conditions. This combination achieves high selectivity for dimethyl sulfoxide (95-98%) while avoiding the formation of byproducts that would require complex vacuum distillation purification
Solution Approach 2:
The Ti-Si molecular sieve acts as an intermediary catalyst that facilitates the oxidation reaction between dimethyl sulfide and hydrogen peroxide. This catalyst mediates the reaction to proceed selectively toward dimethyl sulfoxide formation, preventing side reactions and eliminating the need for complex purification equipment
2Productivity
If conventional catalysts are used for dimethyl sulfide oxidation, then the reaction can proceed, but the conversion efficiency and oxidant utilization are limited
Solution Approach 1:
The patent achieves high dimethyl sulfide conversion (96-99%) and oxidant utility (94-98%) by changing the catalytic parameters. The Ti-Si molecular sieve catalyst with specific surface area (300-500 m²/g) and pore volume (0.2-0.4 mL/g) provides optimal active sites for the oxidation reaction, enabling complete conversion of dimethyl sulfide while maximizing hydrogen peroxide utilization
Solution Approach 2:
The Ti-Si molecular sieve is a porous material with controlled surface area and pore volume that provides numerous active sites for the oxidation reaction. The porous structure allows efficient mass transfer of reactants and products, achieving high conversion rates and oxidant utility without requiring excessive oxidant input
3Productivity
If harsh oxidation conditions are applied to achieve high conversion, then dimethyl sulfide can be fully converted, but the reaction conditions become severe and equipment requirements increase
Solution Approach 1:
The patent achieves high conversion rate (96-99%) under mild reaction conditions by changing the catalytic parameters. The Ti-Si molecular sieve catalyst enables the oxidation reaction to proceed efficiently at lower temperatures and milder conditions compared to conventional methods, reducing equipment requirements and operational complexity while maintaining high productivity
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 process achieves high dimethyl sulfide conversion, efficient oxidant utilization, and high selectivity for dimethyl sulfoxide production, with mild reaction conditions and ease of catalyst separation, making it suitable for large-scale production.
Implementation Method 1
contacting dimethyl sulfide obtained in step (1) with at least one oxidant and a catalyst to produce a mixture containing dimethyl sulfoxide, said catalyst comprises at least one Ti—Si molecular sieve
Implementation Method 2
contacting dimethyl sulfide obtained in step (1) with at least one oxidant and a catalyst to produce a mixture containing dimethyl sulfoxide
Data Source
AI summary
A process for producing dimethyl sulfoxide, wherein said process comprises the following steps: (1) contacting hydrogen sulfide with methanol to produce a mixture containing dimethyl sulfide, and separating dimethyl sulfide from the mixture; and (2) in the presence or absence of a solvent, contacting dimethyl sulfide obtained in step (1) with at least one oxidant and a catalyst to produce a mixture containing dimethyl sulfoxide, said catalyst comprises at least one Ti—Si molecular sieve.