Cyclic Silane Production via Metal Catalyst Pyrolysis
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Solution Overview
Problem
Current methods for producing cyclic silane and cyclic carbosilane compounds suffer from low yield and purity, requiring strict reaction time control and limited silicon content, respectively.
Innovation Solution
Pyrolyzing chained polysilanes in the presence of specific metal oxides or compounds, such as those from Group 8 or Group 11 for cyclic silanes, and transition metal elements or compounds from Groups 12 to 15 for cyclic carbosilanes, at temperatures between 350°C to 450°C to control selectivity and enhance production efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dechlorination reaction of dimethyldichlorosilane using alkali metal or alkali earth metal is used to produce cyclic silane, then cyclic silane can be obtained, but yield and purity are low
Solution Approach 1:
The invention changes the reaction parameters by using metal compounds (Fe, Co, Ni, Cu, Zn) as catalysts instead of alkali metals, and by controlling reaction temperature (300-450°C) and time (1-60 minutes). This transforms the dechlorination reaction into a catalytic process that produces cyclic silane with high yield and purity, resolving the contradiction between productivity and manufacturing precision.
2Productivity
If pyrolysis of chained polysilane under inert gas atmosphere is used to synthesize cyclic silane, then cyclic silane can be obtained, but yield and purity are low
Solution Approach 1:
The invention introduces metal compounds (Fe, Co, Ni, Cu, Zn) as intermediary catalysts that facilitate the pyrolysis reaction. These catalysts mediate between the chained polysilane and the cyclic silane product, enabling the reaction to proceed at lower temperatures (300-450°C) with higher yield and purity, thus resolving the contradiction between productivity and manufacturing precision.
3Productivity
If continuous pyrolysis in heated vacant tube is used to produce cyclic silane, then cyclic silane can be obtained, but strict control of reaction time is required since product may be pyrolized
Solution Approach 1:
The invention changes the reaction temperature parameter to a lower range (300-450°C) made possible by metal compound catalysts. This temperature reduction allows the reaction to proceed faster with better selectivity, extending the optimal reaction time window from minutes to potentially hours, thereby reducing the complexity of reaction time control while maintaining high yield and preventing product pyrolysis.
4Productivity
If dechlorination reaction of terminal chlorosilyl groups using alkali metal or alkali earth metal is used to produce cyclic carbosilane, then cyclic carbosilane can be obtained, but the process only synthesizes those having low silicon content
Solution Approach 1:
The invention changes the catalyst parameter from alkali metals to transition metal compounds (Fe, Co, Ni, Cu, Zn), which enables the reaction to proceed with better control over silicon content. This catalytic system allows synthesis of cyclic carbosilanes with varied silicon content including high silicon content compounds, thereby improving both productivity (silicon content) and adaptability (composition range).
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 efficiently produces cyclic silane and carbosilane compounds with improved selectivity and yield, specifically decamethylcyclopentasilane and 6- to 8-membered cyclic carbosilanes, while allowing for controlled formation between cyclic silane and carbosilane compounds.
Implementation Method 1
subjecting a chained polysilane to pyrolysis in the presence of an oxide of a transition metal belonging to Group 8 or Group 11 of the periodic table, wherein the reaction temperature is 350°C to 450°C
Data Source
AI summary
The present invention relates to: a process for producing a cyclic silane compound, which comprises subjecting a chained polysilane to pyrolysis in the presence of an oxide of a transition metal belonging to Group 8 or Group 11 of the periodic table; and a process for producing a cyclic carbosilane compound, which comprises subjecting a chained polysilane to pyrolysis in the presence of a simple substance of a metal selected from the group consisting of transition metal elements and elements belonging to Groups 12 to 15 of the periodic table or a compound thereof.