Trihalosilane Refining via Divided Wall Distillation
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Solution Overview
Problem
Existing methods for refining trichlorosilane are energy-intensive and result in products with poor purity, particularly due to excessive energy consumption and by-product production in the Siemens technique used for polycrystalline silicon production.
Innovation Solution
A trihalosilane refining device employing a divided wall distillation column (DWC) with specific inlet and outlet port configurations and operating conditions to effectively separate and refine trichlorosilane, minimizing energy consumption and enhancing product purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional distillation methods are used to refine trichlorosilane, then separation can be achieved, but energy consumption is excessive
Solution Approach 1:
The distillation column is divided into multiple sections with different functions: a preliminary separation section for removing low-boiling-point impurities, a main separation section for separating trichlorosilane from high-boiling-point impurities, and a stripping section. This segmentation allows each section to operate under optimized conditions, reducing overall energy consumption while maintaining high product purity.
Solution Approach 2:
The preliminary separation section performs preliminary removal of low-boiling-point impurities before the main separation process. This preliminary action reduces the burden on subsequent separation stages, lowering the total energy required for purification while ensuring high final product purity.
2Productivity
If conventional refining methods are used, then processing can be completed, but product purity is poor
Solution Approach 1:
The column is segmented into multiple functional sections that systematically address different impurity types: preliminary separation for low-boiling-point contaminants, main separation for high-boiling-point contaminants, and stripping for residual impurities. This segmented approach ensures comprehensive purification while maintaining efficient production rates.
Solution Approach 2:
The distillation process maintains continuous operation with reflux streams circulating through the column, ensuring continuous separation and purification. The continuous action of reflux and product withdrawal maintains high separation efficiency and product purity throughout the operation.
3Manufacturing precision
If multiple distillation columns are used to improve purity, then separation efficiency increases, but device complexity increases
Solution Approach 1:
Multiple separation functions that would traditionally require separate distillation columns are merged into a single integrated column with internal divisions. The preliminary separation section, main separation section, and stripping section are combined in one structure, reducing equipment quantity and system complexity while maintaining high product purity.
Solution Approach 2:
The separation process is extended into the vertical dimension within a single column through internal dividers and multiple active zones. This vertical dimensionality allows multiple separation stages to occur within one column footprint, reducing horizontal expansion and overall system complexity.
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 trihalosilane refining device achieves high-purity trihalosilane production while significantly reducing energy consumption by optimizing the separation efficiency within the DWC and subsequent distillation columns.
Implementation Method 1
a divided wall distillation column (DWC) installed to enable an inflow of a feed containing a trihalosilane
Implementation Method 2
which has a condenser 102 and a reboiler 103 formed respectively in upper and lower portions thereof
Implementation Method 3
which has a condenser 102 and a reboiler 103 formed respectively in upper and lower portions thereof
Data Source
AI summary
A trihalosilane refining device and a trihalosilane refining method are provided. The trihalosilane refining device can be useful in obtaining high-purity trihalosilane from a feed containing a trihalosilane while consuming a small amount of energy.