Purification of silicon

Details Purification of silicon Purification of silicon

1982-05-24

1984-01-31

Vertiz, O. R.

Chemistry of inorganic compounds

Silicon or compound thereof

Elemental silicon

556471, C01B 3302

Patent

active

044289170

ABSTRACT:
A process for manufacturing (very high purity) solare voltaic cell grade silicon involving the steps of reacting impure silicon tetrachloride with a lower molecular weight alcohol (e.g. ethanol) to form a silicon alkoxide (e.g. tetraethyl silicate) and then isolating a pure silicon alkoxide by filtration and fractional distillation. The purified silicon alkoxide can then be chemically reduced by reacting with a metal (e.g. Na) thus recovering high purity elemental silicon. The reaction byproducts (e.g. HCl and NaOR) can be used to regenerate the alcohol and resulting salt (e.g. NaCl) can be subjected to electrolysis to recover the metal and the halogen, thus leading to an overall process with total recycle of byproducts.

REFERENCES:
patent: 2953466 (1960-09-01), Brown
Emblem, H. G. article in "Chemical Products", (GB), vol. 20, pp. 493-494, Dec. 1957.
Gerrard, W. et al., article in "J. Chem. Soc.", (GB), 1956; pp. 1536-1539.

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