Trihalosilane Refining with Divided Wall Distillation
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Solution Overview
Problem
Existing methods for refining trichlorosilane, such as those using the Siemens technique, face issues with high energy consumption and poor product purity, particularly due to the production of excessive by-products and the explosive nature of monosilane.
Innovation Solution
A trihalosilane refining device employing a divided wall distillation column (DWC) is designed to efficiently separate trichlorosilane by introducing a feed into the column, with specific inlet and outlet port configurations and operating conditions that allow for effective separation of low, middle, and high boiling point components, minimizing energy consumption and maximizing product purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional distillation methods are used for trichlorosilane refining, then the process is simple to operate, but energy consumption is excessive and product purity is poor
Solution Approach 1:
The distillation process is divided into multiple columns with specific functions: a first distillation column for preliminary separation and a second distillation column for final purification. This segmentation allows each column to be optimized for its specific separation task, improving overall energy efficiency and product purity while avoiding the need for a single complex high-energy column
Solution Approach 2:
The patent introduces an intermediate storage tank between the first and second distillation columns. This intermediary allows the system to decouple the two distillation processes, enabling independent optimization of each column's operating parameters and improving overall energy efficiency while maintaining high product purity through sequential refinement
2Ease of manufacture
If monosilane is used as a source material, then the manufacturing process can be simplified, but the material becomes highly explosive and produces excessive by-products
Solution Approach 1:
The patent changes the chemical composition parameter by using trichlorosilane instead of monosilane as the source material. This parameter change eliminates the explosive hazard inherent in monosilane while maintaining the ability to produce high-purity polycrystalline silicon through controlled chemical reactions and distillation processes
3Device complexity
If a single distillation column is used, then the device complexity is reduced, but the separation efficiency for multiple boiling point components is insufficient
Solution Approach 1:
The separation system is segmented into multiple distillation columns, each optimized for separating components with specific boiling point ranges. The first column handles preliminary separation of high-boiling impurities, while the second column performs final purification of low-boiling components, achieving high separation efficiency without requiring an overly complex single-column design
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, as demonstrated by simulation results showing a substantial decrease in energy usage compared to conventional methods.
Implementation Method 1
a divided wall distillation column (DWC) installed to enable an inflow of a feed containing a trihalosilane... the trihalosilane introduced into the divided wall distillation column... an effluent containing the refined trihalosilane can be extruded
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.