Analysis of pressure-driven distillation
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This post was last edited by *ng*ng916 on 2012-3-29 at 11:52. The advantages and disadvantages of pressure distillation and atmospheric distillation are that pressure distillation allows for higher production volumes, but the quality is relatively lower.
Theoretically, as the distillation pressure increases, the relative volatility of the substances decreases, resulting in a relatively reduced separation efficiency. But it wasn’t noticeable during actual operation
The theory is that, yes. However, a comprehensive consideration is needed to determine whether the degree of decrease in relative volatility within the pressure range affects the separation efficiency, and to what extent. In general chlorosilane systems, the pressure must be increased significantly for there to be a noticeable decrease in relative volatility
What is the pressure control for the distillation towers among you? Please share~ 0.3 Mpa seems to be a common value.
What is the purpose of using pressurized distillation in so many polysilicon projects?
Pressure distillation accelerates the separation of materials under high pressure; as long as the radial flow column is properly designed, the yield from pressure distillation will definitely be higher than that of distillation at normal pressure! This is very common in chemical production!
The operating pressure used in current pressure-driven distillation is not very high; it’s only a few kilograms
LZ should first read some books on distillation before posting; there are many available online.
What pressure is achieved in a pressurized distillation column? I’ve not been too sure
A distillation process that operates at a tower top pressure higher than atmospheric pressure is called pressurized distillation. Pressurized distillation is used for the separation of chlorosilanes in polysilicon companies because the boiling points of the chlorosilane mixtures to be separated are relatively low. Also, in terms of the distillation process, achieving a higher pressure ratio results in lower costs in terms of equipment and energy consumption.