Trichlorosilane Conversion Cooling Rate and Polymer Control
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Solution Overview
Problem
Existing methods for manufacturing trichlorosilane suffer from low conversion ratios and polymer formation, leading to pipe clogging and reduced efficiency due to inadequate cooling rates and reverse reactions.
Innovation Solution
A method involving a conversion reaction at 1000-1900°C, followed by rapid cooling to 950°C within 1 second, and maintaining the reaction product in a 600-950°C range for 0.01-5 seconds, with subsequent cooling to below 600°C, using heat exchange with silicon tetrachloride and hydrogen to suppress reverse reactions and decompose polymers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the reaction product gas is cooled by a heat exchanger at a low cooling rate, then the reaction product gas can be sufficiently cooled, but the reverse reaction occurs and the conversion ratio to trichlorosilane deteriorates
Solution Approach 1:
The patent changes the cooling rate parameter from low to high (rapid cooling within 1 second), which prevents the reverse reaction and maintains high conversion ratio to trichlorosilane while achieving sufficient cooling
2Productivity
If the reaction product gas is rapidly cooled to suppress the reverse reaction, then the conversion ratio improves, but polymer is generated as a by-product and pipe clogging occurs
Solution Approach 1:
The cooling process is segmented into two distinct stages: first rapid cooling within 1 second to suppress reverse reaction and improve conversion ratio, then slower cooling at a controlled rate to prevent polymer formation and pipe clogging
Solution Approach 2:
The patent performs preliminary rapid cooling to suppress the reverse reaction before the polymer formation can occur, thereby preventing the harmful effect of pipe clogging while maintaining high conversion ratio
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 enhances trichlorosilane production by reducing reverse reactions and polymer formation, improving conversion efficiency and maintaining apparatus integrity by minimizing polymer deposition.
Implementation Method 1
a heat exchanger is provided at a lower portion of the reaction chamber, and a raw material gas supplying tube through which hydrogen and silicon tetrachloride are supplied... In the heat exchanger, a feed gas supplied to the reaction chamber is preheated by heat transferred from a reaction product gas that is discharged from the reaction chamber
Implementation Method 2
a conversion reaction apparatus (conversion furnace) disclosed in Patent Document 1 is known as an apparatus for manufacturing trichlorosilane... a reaction chamber for obtaining a reaction product gas containing trichlorosilane and hydrogen chloride by introducing silicon tetrachloride and hydrogen to the reaction chamber and performing the conversion reaction of the silicon tetrachloride and hydrogen at a temperature of 600 to 1200° C.
Data Source
AI summary
A method of manufacturing trichlorosilane includes a conversion reaction process (first reaction process) for producing a first reaction product gas, which contains trichlorosilane, dichlorosilylene, hydrogen chloride, and high-order silane compounds, by performing a conversion reaction of silicon tetrachloride and hydrogen, which are raw materials, in a first temperature range that is equal to or higher than 1000° C. and equal to or lower than 1900° C.; a first cooling process for cooling the first reaction product gas to a temperature of 950° C. or lower within 1 sec (except that the first reaction product gas is cooled to a temperature lower than 600° C. within 0.01 sec); a second reaction process for maintaining the temperature of the first reaction product gas in a second temperature range, which is equal to or higher than 600° C. and equal to or lower than 950° C., during the time that is equal to or more than 0.01 sec and equal to or less than 5 sec; and a second cooling process for cooling a second reaction product gas, which has been subjected to the second reaction process, to a temperature lower than 600° C.