High-Purity Chloropolysilane Production via Copper Catalyst Mediation
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Solution Overview
Problem
Current methods for manufacturing high-purity chloropolysilane, such as hexachlorodisilane, face challenges in achieving high purity at low temperatures using high-purity metallic silicon, as the chlorination reaction tends to be slow and is hindered by impurities like Al and Ti, and the use of copper compounds leads to unwanted by-products and reactor accumulation.
Innovation Solution
An activated catalyst is produced by heating a mixture of high-purity metallic silicon and copper or copper compounds in an inert atmosphere, allowing a chlorination reaction at a relatively low temperature to produce high-purity hexachlorodisilane, and the reaction is continued by adding only metallic silicon, avoiding copper compound accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-purity metallic silicon is used as raw material, then the purity of chloropolysilane product is improved, but the chlorination reaction becomes extremely slow and requires high temperature
Solution Approach 1:
Copper or copper compound is introduced as a catalyst to mediate the chlorination reaction between high-purity metallic silicon and chlorine. The catalyst provides an alternative reaction pathway with lower activation energy, enabling the reaction to proceed at relatively low temperatures (140-300°C) while maintaining high product purity. This resolves the contradiction by allowing both high purity raw material and fast reaction rate to coexist through catalytic mediation.
Solution Approach 2:
The invention changes the temperature parameter to a relatively low range (140-300°C) by using copper catalyst, which is unusual for chlorination reactions that typically require high temperatures. This parameter change enables the reaction to proceed rapidly at low temperatures while maintaining high product purity, thus resolving the contradiction between reaction rate and product purity.
2Temperature
If copper or copper compound is added to conduct chlorination reaction at low temperature, then the reaction temperature is lowered, but copper accumulates in the reactor and by-products are generated
Solution Approach 1:
The invention extracts and removes copper from the reaction system after the chlorination reaction is complete. By separating copper from the product stream, the harmful accumulation of copper in the reactor is prevented, and copper-containing by-products are eliminated. This allows the beneficial low-temperature reaction to occur while preventing the harmful effects of copper buildup.
Solution Approach 2:
Copper or copper compound is used as a catalyst that can be discarded or recovered after the reaction. The invention enables the copper to be separated from the chloropolysilane product, allowing it to be discarded or recovered for reuse, thus preventing harmful accumulation in the reactor while maintaining the benefits of low-temperature reaction.
3Loss of energy
If reaction temperature is lowered to reduce energy consumption and by-product formation, then energy efficiency is improved, but the reaction becomes extremely slow
Solution Approach 1:
Copper or copper compound serves as a catalyst that mediates the chlorination reaction, providing an alternative pathway with lower activation energy. This enables the reaction to proceed at low temperatures (140-300°C) with high reaction rate, thus resolving the contradiction between energy efficiency and productivity by making the low-temperature pathway available through catalysis.
Solution Approach 2:
The invention changes the temperature parameter to a low range (140-300°C) made possible by copper catalysis, which fundamentally alters the reaction kinetics. This parameter change enables simultaneous achievement of low energy consumption and high reaction rate, as the catalyzed pathway allows rapid reaction progression at temperatures that would otherwise be too low for meaningful reaction rates.
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 method enables the production of chloropolysilane with low Al and Ti impurities, reducing reaction residues and costs, and is environmentally friendly by maintaining low reaction temperatures and minimizing copper accumulation.
Implementation Method 1
An activated catalyst having activity to reaction between metallic silicon and chlorine is produced by heating a granular mixture of high-purity metallic silicon and metallic copper or a copper compound in an inert atmosphere. Then, by conducting a chlorination reaction at a relatively low temperature with the use of the activated catalyst, high-purity hexachlorodisilane is obtained.
Data Source
AI summary
A chlorination reaction can be carried out at a relatively low temperature by heating a mixture of granular metallic silicon and metallic copper or a copper compound in an inert atmosphere even when the metallic silicon has a high purity and does not contain aluminum and titanium and that chloropolysilane of high purity can be obtained by further adding metallic silicon as needed after the chlorination reaction is started.