Monothiocarbonate Synthesis via Group IIIb IVb Metal Salt Catalysts
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Solution Overview
Problem
Existing methods for producing monothiocarbonates are either expensive due to the use of rare and radioactive thorium or involve costly and scarce starting materials, and they lack efficiency and selectivity for industrial-scale production.
Innovation Solution
A process involving the reaction of a compound with a mercaptoalcohol group and a dialkylcarbonate in the presence of a catalyst, specifically a salt of a metal from group IIIb or IVb of the periodic system, such as scandium or titanium, to produce monothiocarbonates with high yield and selectivity, avoiding expensive starting materials and facilitating industrial-scale production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If thorium catalyst is used for monothiocarbonate production, then high yield and selectivity are achieved, but the process becomes expensive and problematic due to thorium's radioactivity and rarity
Solution Approach 1:
The patent replaces expensive thorium catalyst with cheaper, non-radioactive metal salts from groups IIIb or IVb (such as aluminum, gallium, indium, thallium, scandium, titanium, zirconium, hafnium). These alternative catalysts achieve comparable activity without the radioactive and economic problems of thorium, making the process commercially viable.
Solution Approach 2:
The patent changes the catalyst composition parameter from thorium-based to alternative metal salt-based catalysts. This parameter change maintains catalytic effectiveness while eliminating the harmful and expensive characteristics of thorium, thus resolving the contradiction between productivity and ease of manufacture.
2Productivity
If conventional methods are used for monothiocarbonate synthesis, then production is achieved, but the process is complex and not suitable for industrial scale
Solution Approach 1:
The patent divides the catalytic system into simple metal salt components (groups IIIb or IVb) combined with base additives. This segmentation simplifies the catalyst formulation and reaction conditions compared to complex thorium-based systems, making industrial implementation easier while maintaining high productivity.
3Productivity
If rare and expensive starting materials are used, then monothiocarbonates can be produced, but the process becomes economically unviable
Solution Approach 1:
The patent employs readily available metal salts from groups IIIb or IVb as catalysts, replacing rare thorium. These alternative catalysts are abundant, non-radioactive, and economically viable, thus resolving the contradiction between production capability and material availability.
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 process achieves high yield and selectivity in producing monothiocarbonates, making it economically viable and suitable for industrial production without the use of rare or radioactive materials, and is easy to perform.
Implementation Method 1
reacting a compound with at least one mercaptoalcohol group and a dialkylcarbonate in the presence of a catalyst wherein the catalyst is a salt of a metal selected from group IIIb or IVb of the periodic system
Data Source
AI summary
Process for the preparation of a compound with at least one monothiocarbonate group by reacting: - a compound with at least one mercaptoalcohol group and - a dialkylcarbonate, in the presence of a catalyst wherein the catalyst is a salt of a metal selected from group IIIb or IVb of the periodic system.