Phenylsilane Boron Removal in Halosilane Purification
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for removing boron compounds from halosilane compositions, such as those used in the production of polycrystalline silicon and silicones, are inefficient and result in significant losses of valuable silicon compounds due to the difficulty in separating boron-containing impurities by distillation, leading to high costs and contamination issues.
Innovation Solution
The method involves bringing the halosilane composition into contact with phenylsilanes, which convert boron compounds into higher-boiling compounds, facilitating their removal through thermal separation methods like distillation, thereby minimizing the loss of valuable halosilanes and reducing boron content to less than 1 ppmw.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If distillation is used to separate boron compounds from halosilanes, then boron removal is attempted, but separation efficiency is poor due to similar boiling points
Solution Approach 1:
The invention changes the chemical composition parameters by introducing phenylsilane reagents that react with boron compounds to form new compounds with different physical properties (higher boiling points), enabling effective separation through standard distillation processes
Solution Approach 2:
Phenylsilane acts as an intermediary substance that facilitates the separation process by temporarily binding to boron compounds, transforming them into separable forms that can be removed through distillation, and can be subsequently released or disposed of
2Manufacturing precision
If conventional distillation is used to remove boron impurities, then some boron removal is achieved, but significant losses of valuable silicon compounds occur
Solution Approach 1:
The invention selectively extracts boron compounds from the halosilane mixture by converting them into distinct chemical forms through reaction with phenylsilane, allowing boron to be removed in a separate stream while retaining the valuable halosilanes in the main product stream
Solution Approach 2:
By changing the chemical state of boron compounds through reaction with phenylsilane, the invention creates a physical property difference (boiling point) that enables selective separation, preventing co-loss of valuable halosilanes during the removal process
3Manufacturing precision
If multiple distillation steps are used to achieve low boron content, then purification is improved, but process time and operational costs increase
Solution Approach 1:
The invention performs a preliminary chemical conversion of boron compounds into separable forms before distillation, which simplifies and accelerates the subsequent separation process, reducing the number of distillation stages needed to achieve target purity levels
Solution Approach 2:
By transforming boron compounds into high-boiling phenylboron derivatives, the invention creates a large boiling point difference that enables rapid, single-stage or reduced-stage distillation separation, significantly reducing process time compared to conventional multiple-stage distillation
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 approach effectively reduces boron content in halosilane compositions to very low levels without losing valuable silicon compounds, simplifying the distillation process and reducing operational costs by eliminating the need for additional substreams and complex separation methods.
Implementation Method 1
bringing the composition into contact with at least one phenylsilane... which convert boron compounds into higher-boiling compounds
Implementation Method 2
removing the at least one halosilane by means of a suitable thermal separation method, in particular distillation
Data Source
AI summary
The content of boron compounds in a composition containing at least one halosilane is reduced by bringing the composition into contact with at least one phenylsilane and removing the at least one halosilane. The invention further relates to the use of phenylsilanes for removing boron compounds from halosilane-containing compositions.