What are the impurities generated during the synthesis of trichlorosilane?
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In the synthesis reaction of trichlorosilane, apart from the common impurities such as calcium chloride, aluminum chloride, iron(III) chloride, phosphorus trichloride, and boron trichloride, what other substances are formed? Those who know about it, please share your insights.
In addition, there is still a small amount of other forms of metal impurities, as well as B and P impurities
The silicon blocks vary from place to place, as do the impurities present. Through X-ray diffraction analysis, it was determined that the silicon powder used in our factory contains impurities such as calcium, fluorine, aluminum, phosphorus, zinc, sulfur, nickel, copper, tin, and zinc.
Is there any substance that is highly flammable and poses a great danger during maintenance? During our maintenance work, it catches fire just from friction, and sometimes even the feet that touch the ground can ignite it. I’m scared inside; I don’t know what it is. It is said that the things you don’t know in a chemical plant are the most dangerous; I hope my friend Houhai can help resolve this concern!
The material that can be burned is estimated to be a polymer of chlorosilanes
In what form does B exist? Element, or compound? Many people think it’s BCL3; is that correct?
Hehe, it contains a lot of impurities. There are over 40 kinds. Mass spectrometry can be used to understand this
We now also suspect that the substance capable of catching fire is P, but an analysis of the P content in the raw silicon powder showed no significant increase. Now, burning occurs almost every time flanges are removed and filters are cleaned; the safety risk is extremely high. Do any of you have encountered similar situations and know of ways to resolve them or mitigate the risk?
Our factory often encounters situations where flanges need to be removed for cleaning filters and burning processes. When carrying out disassembly, maintenance, etc., it is important to maintain a slight positive pressure inside the device; if possible, flushing with water can be helpful in this regard.
Rinsing with water will only increase the risk of corrosion in the equipment. Moreover, using water generates a lot of smoke, which makes it difficult to control from an environmental perspective; it also produces a large amount of silicon dioxide, which is not good for the system.
Do you use catalysts? If there is a copper-based catalyst, it also burns easily.