Liquid Phase Trichlorosilane Production via Metal Silicon Dispersion
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Solution Overview
Problem
Existing methods for producing trichlorosilane from tetrachlorosilane in polysilicon production are inefficient, leading to non-uniform product quality due to fluctuating reaction temperatures and the need for continuous replenishment of metal silicon particles, which results in inefficient conversion and reuse of tetrachlorosilane.
Innovation Solution
A method involving the dispersion of metal silicon particles in liquid tetrachlorosilane, optionally reacting with hydrogen chloride in a tubular reactor at controlled temperatures and pressures, facilitating a liquid phase reaction that enhances contact efficiency and productivity, using a microtubular reactor for improved heat control and minimizing side reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If metal silicon particles are continuously replenished in a fluidized bed reactor, then the production of trichlorosilane can be maintained, but the reaction temperature fluctuates and product quality becomes non-uniform
Solution Approach 1:
The invention changes the physical state parameter of tetrachlorosilane from gas to liquid, and conducts the reaction in the liquid phase. This parameter change allows for better temperature control and eliminates the need for continuous replenishment of metal silicon particles, thereby maintaining both high productivity and uniform product quality
Solution Approach 2:
The invention introduces liquid tetrachlorosilane as an intermediary medium to dissolve metal silicon particles and facilitate the reaction. This liquid medium acts as a carrier that enables continuous reaction without temperature fluctuations, resolving the contradiction between maintaining productivity and ensuring quality uniformity
2Productivity
If metal silicon particles are used in a fluidized bed reactor, then the conversion of tetrachlorosilane to trichlorosilane can proceed, but residual metal silicon requires separation
Solution Approach 1:
By changing the reaction medium to liquid tetrachlorosilane and conducting the reaction in the liquid phase, the invention enables complete dissolution and reaction of metal silicon particles. This eliminates residual metal silicon that would otherwise require separation, while maintaining high conversion efficiency
Solution Approach 2:
The invention extracts the separation step from the process by ensuring complete reaction of metal silicon in the liquid phase. The residual metal silicon problem is eliminated, and only the necessary distillation step remains for product purification
3Productivity
If gas phase reaction is used in a fluidized bed reactor, then the reaction can proceed, but heat control is difficult and side reactions occur
Solution Approach 1:
The invention changes the reaction phase from gas to liquid by using liquid tetrachlorosilane as the medium. Liquid phase reactions provide superior heat transfer and temperature control compared to gas phase, eliminating side reactions while maintaining high productivity
Solution Approach 2:
Liquid tetrachlorosilane serves as an intermediary heat transfer medium that facilitates efficient heat control. The liquid phase allows for uniform heat distribution and prevents the temperature fluctuations that cause side reactions in gas phase fluidized bed reactions
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 results in high productivity and improved quality of trichlorosilane production, allowing for efficient reuse of tetrachlorosilane and eliminating the need for residual metal silicon separation, while maintaining consistent reaction conditions.
Implementation Method 1
the metal silicon particles with hydrogen chloride in the presence of hydrogen gas
Implementation Method 2
a tubular reactor equipped with heating means, to which the dispersion of the metal silicon particles in the liquid mixture is supplied
Data Source
Figure 1~2
AI summary
The present invention relates to a method for producing trichlorosilane. The method includes dispersing metal silicon particles in liquid silane-based compounds containing tetrachlorosilane and optionally reacting the metal silicon particles with hydrogen chloride in the presence of hydrogen gas.