Selective Cleavage of Oligomeric Silanes via Nitrogen Catalyst
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Solution Overview
Problem
High-purity oligomeric halosilanes produced in the semiconductor and solar industries are underutilized due to a lack of effective conversion processes to monomeric and dimeric silicon compounds, which are valuable for applications such as silicon nitride layer production and other silicon-based materials.
Innovation Solution
A process involving the reaction of oligomeric silanes with hydrogen halide in the presence of a nitrogen-containing catalyst at specific temperature and pressure conditions allows for the conversion of oligomeric halosilanes into monomeric and dimeric silicon compounds without the need for additional energy, enabling their separation through distillation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If oligomeric halosilanes are produced in semiconductor and solar industries, then high purity is achieved, but application technology relevance is insufficient
Solution Approach 1:
The patent applies parameter changes by modifying the molecular weight of silanes through controlled cleavage reactions. Oligomeric halosilanes (higher molecular weight) are converted into monomeric and dimeric silanes (lower molecular weight) by reacting with hydrogen halide in the presence of a nitrogen-containing catalyst at 80-120°C. This parameter transformation enables the high-purity oligomeric by-products to be converted into application-relevant low molecular weight compounds suitable for semiconductor and solar industries.
2Productivity
If conventional plasma discharge processes are used, then silanes are produced, but higher molecular weight oligomers are formed as by-products
Solution Approach 1:
The patent converts the harmful by-product (higher molecular weight oligomeric halosilanes) into a beneficial product. Instead of discarding or complexly separating these oligomers, the process reacts them with hydrogen halide in the presence of a nitrogen-containing catalyst to cleave them into desired monomeric and dimeric silanes. This transforms the waste by-product into the target product, eliminating separation complexity and improving overall process efficiency.
3Adaptability or versatility
If oligomeric silanes are converted to monomeric silanes, then application relevance improves, but additional energy input is required
Solution Approach 1:
The patent employs a self-service mechanism where the hydrogen halide reacts with the oligomeric silanes in the presence of a nitrogen-containing catalyst to initiate cleavage. The reaction proceeds at moderate temperatures (80-120°C) without requiring additional energy-intensive steps. The system uses the chemical reactivity of hydrogen halide and the catalytic activity of nitrogen-containing compounds to drive the conversion, minimizing external energy input while achieving the desired monomeric and dimeric silane products.
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 converts high-purity oligomeric silanes into low molecular weight halosilanes, such as trichlorosilane and hexachlorodisilane, promoting their application in silicon-based technologies while omitting complex cleaning steps and energy-intensive processes.
Implementation Method 1
reacting the oligomeric silane or the mixture in the presence of hydrogen halide over a nitrogen-containing catalyst
Implementation Method 2
the monomeric and optionally dimeric silicon compounds of the formula I can be separated from the oligomeric silanes, preferably separated by distillation
Data Source
Figure 1
AI summary
The invention relates to a process for preparing monomeric and/or dimeric halogen- and/or hydrogen-containing silicon compounds from oligomeric inorganic silanes having at least three directly covalently bonded silicon atoms, the substituents of which are selected from halogen, hydrogen and/or oxygen, by converting the oligomeric silane over a nitrogen-containing catalyst in the presence of hydrogen halide.