What issues should be considered in the synthesis of trichlorosilane? ? ?
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During the startup of a trichlorosilane synthesis furnace, failures in startup often occur due to improper control of silicon powder, HCL, and temperature； What issues should be taken into account while driving here? ?
I’m not involved in this work, but following the design temperature and operating procedures, there shouldn’t be any problems, I guess
When starting up the trichlorosilane production process, it is first necessary to check whether the temperature of the fluidized bed meets the required levels, as well as the purity of HCL and its moisture content. The particle size of the silicon powder also matters; different fluidized beds require silicon powder with different mesh sizes. At the beginning, when HCL is introduced, the bed temperature tends to drop significantly, so this needs to be taken into account. Once the silicon powder reacts with HCL, the temperature will rise again. Additionally, proper control of the bed layer in the fluidized bed is essential
I have a question: In a trichlorosilane synthesis furnace, after HCl is introduced, is the temperature higher at the top or at the bottom?
Of course, it’s the one below that’s high. But if it’s controlled properly, the temperature difference won’t be very large; it depends on how well it’s controlled, haha
Why is the temperature higher below?
Where to introduce the hydrogen chloride gas, below?
The lower part of the fluidized bed is the dense phase zone, where the reaction primarily takes place; therefore, the temperature there is high
Silicon powder and hydrogen chloride should be added gradually; the temperature of the outer wall should not be too high, as it can rise rapidly. Once growth occurs, increase the amount of air supplied, while still keeping an eye on the temperature. When hydrogen chloride is introduced, two outcomes are possible: if the reaction becomes more intense, it indicates that the heat is not being removed; when the temperature drops, reduce the amount of air supplied promptly to prevent shutdown. For details, QQ339565429