Silane production methods
Thread Content
Silane production methods include the UCC process, the Komatsu method, the ETHYL method, etc., and now there is also the triethoxysilane disproportionation method. The raw materials for the triethoxysilane disproportionation method (metallurgical silicon and ethanol) are readily available, and this method requires less energy to produce polysilicon; those interested can discuss it further.
I’m not quite familiar with this yet; it seems I need to keep working hard
There are few manufacturers using the silane method for production these days, right?
The production of polysilicon using the silane method is prone to explosions, and only a few companies around the world use this method.
The explosion problem was resolved long ago; currently, silane technology is very safe. Triethoxysilane is used to produce high-purity silane, which is then thermally decomposed to yield high-purity polycrystalline silicon. This method is cost-effective and requires low energy consumption, and as far as I know, it represents the most advanced technology available today
Chlorine Free Technology is a patented technology developed by the Russian INTERSOLAR Center and the U.S. National Renewable Energy Laboratory (NREL) based on the SiH4 thermal decomposition process used for producing polycrystalline silicon in the former Soviet Union. It represents a highly promising technique for manufacturing solar-grade polycrystalline silicon. Its raw material is metallurgical-grade silicon, and the process involves: (1) the reaction of metallurgical-grade silicon with ethanol at 280°C in the presence of a catalyst to produce Si(OC2H5)3H ； (2) Si(OC2H5)3H is further decomposed into SiH4 and Si(OC2H5)4 under the action of a catalyst ； (3) SiH4 purified from the aforementioned mixture using low-energy consumption concentration and adsorption methods is pyrolyzed at high temperatures of 850–900°C to produce high-purity polysilicon and hydrogen ； Hydrolyzing Si(OC2H5)4 can yield high-purity SiO2 or silica sol, and the ethanol produced can be recycled. Using this process technology, only 15–30 kWh of energy is required to produce 1 kg of polysilicon, with a silicon yield (polysilicon, major by-products, silica sol) of 80–90%. The specific process is as follows: Silicon + ethanol > Triethoxysilane > Disproportionation reaction > Silane + Tetraethoxysilane > Silane cracking > Silicon
What method is it that uses silicon tetrafluoride and sodium aluminum hydride to produce silanes? I heard that two companies in China are using this method.
The 7th floor mentioned American technology; currently, two companies in China are using it: Hebei 69 and Zhejiang Zhongning
7th Floor: This manufacturing process was developed by the American company MEMC; the company currently has a factory that uses this process to produce polysilicon. However, the silane production methods are different.
It makes a difference whether it is a silane production method or a polysilicon production method; it seems that what the original poster is referring to is the silane production method
:) Silanes are really expensive; I heard it costs 1 million yuan per ton, while polysilicon costs less than 50 million yuan per ton