How many distillation towers are required for the purification of polysilicon from silicon trichloride in solar energy applications?
Thread Content
This post was last edited by LHY8771 on 2009-5-7 09:33. How many distillation towers are needed for the separation and purification of polysilicon, and what factors determine this? I think it must be related to production capacity as well as the tower diameter and height! Because the production capacity determines the amount of polysilicon produced, while the tower diameter and height determine the tower’s processing capacity. What do you think?
How many columns are typically used for the distillation and purification of solar-grade trichlorosilane?
It is mainly determined based on one’s own processing techniques; to simply distill it to a solar-grade purity of 7–9 nines, at least 4 columns are required, and an additional 2 columns are needed if recycling is to be implemented.
The effect of the two towers doesn’t seem ideal
I think the original poster has already found the answer. First, what product do you want to obtain and what requirements does it need to meet? Solar-grade: depending on the process, some require 5 towers, while others need 6 to 10 or more towers ； Electronic-grade; some require 6 towers, and the maximum number I’ve heard of is 12 towers. Distillation for purification is not as simple as the original poster suggested. First, have you chosen a plate tower or a packed tower? Only then are tower diameter and height, tray spacing, packing efficiency, and height considered. There is still much to learn*, let’s work together. In fact, we are all still beginners; we truly hope that the experts from design institutes, those skilled in polysilicon production, and technical specialists will join us and share their knowledge with us!
What are the respective functions of the two towers? Will the first column produce pure trichlorosilane, and the second column produce silicon tetrachloride? This is my first time encountering this; please give me some guidance
At least 4 towers are required: one placed at a lower level, one at a higher level, and two used to raise the TCS level to that of solar energy. If recycling is to be done, two additional towers are needed to purify the material that has been recovered. Typical plants use around 8 towers in total~
11 towers are the best; they’re optimal from any perspective
10 towers can achieve solar-grade performance, while 21 towers can achieve electronic-grade performance! Whoosh!
The key is the removal of boron and phosphorus impurities, which depends on the processing capacity of your tower