Impurities such as iron in the process of synthesizing trichlorosilane from silicon powder
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Do impurities such as iron and aluminum in silicon powder react with hydrogen chloride? Not long ago, I saw a post from a forum member who said that a reaction should occur, but I’m a bit confused. Iron should remain relatively stable in dry gases; hydrogen chloride is a covalent compound, and for iron to react it needs to lose electrons. Would such a reaction take place in a fluidized bed as well? The foundation from before wasn’t very solid, so I’d like to hear everyone’s opinions～
A reaction does occur, especially with AL; however, the high chloride content in AL can result in an extremely high conversion rate of silicon trichloride
Anything that needs to react should be removed as much as possible.
Chlorine contains some water, so the reaction occurs
There must be a reaction; the impurities that are generated need to be removed through the distillation step that follows. . .
It’s better to have a low level of AL; the chlorides produced pose significant problems during later processing. I’m not sure how you handle that issue
Even the purest HCL obtained from HCL synthesis contains water, so a reaction is definitely necessary! The high-boiling substances that are formed are indeed a nuisance; clogs in the pre-cooler are common, and they need to be cleaned regularly. Apart from removing these high-boiling substances, distillation is what’s necessary!
All of them need to react, and the aluminum present can increase the conversion rate of the crude product