What should be noted during the use of a hydrogenation furnace?
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As the title suggests, there is a hydrochlorination step in the polysilicon production process, which is the most dangerous part. What precautions should be taken during its use?
What hydrogenation fears the most is leakage! The most common issue is a lack of water in the hydrogenation furnace jacket, leading to dry burning! What is the chlorination process that LZ mentioned? Could you explain it?
Hydrogenation furnaces shouldn’t pose as many risks as reduction furnaces, right? The biggest concern is frequent starting and stopping, which shortens the lifespan of the heating elements!:lol
Chlorination is the reaction H2 + CL2 = HCl; this is the first step in the entire polysilicon production process, taking place in a chlorination furnace at a temperature of around 500 degrees
I’m not sure what process is used for hydrogenation these days; previously, we used recycled SICL4 + H2 + SI powder in a reaction furnace. Silicon powder is heated to 480 degrees in a drying furnace, while hydrogen is dried in a separate heater. The entire reactor is heated using inductance, at a temperature of around 400 degrees and a pressure of 1.5 Mpa. In this process, a conversion rate of about 20% for SICL4 is considered good.
That’s not right; you’re talking about the synthesis of hydrogen chloride. Chlorination should be a separate unit, primarily used to chlorinate compounds such as dichlorodihydrosilicon into silicon tetrachloride. I wonder if that sea friend has information on this topic? Share it.
Chlorination is generally divided into hydrochlorination and low-pressure chlorination; the former is mainly used to convert metallic silicon into silicon chlorides, while the latter is primarily used to convert silicon tetrachloride into trichlorosilane.
Where are you from? Are you using chlorohydrin as well? We also use chlorohydration, but the pressure is over 20 atmospheres and the temperature is close to 600 degrees; the maximum conversion rate in a single batch can reach 28%