Purification process for compounds useful in optical fiber manufacture

US4372834A · kind A · utility

Assignee

• Bell Telephone Laboratories, Inc. · US

Inventors

• Robert L. Barns · Berkeley Heights, US
• Edwin Arthur Chandross · New Providence, US
• Daniel Flamm · Walnut Creek, US
• Louis Thomas Manzione · Summit, US
• Larry F. Thompson · Gillette, US

Key dates

• Filing date: Jun 19, 1981
• Grant date: Feb 8, 1983
• Expiry date: Jun 19, 2001

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01B33/10778
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Silicon tetrachloride is processed to ultrahigh purity by subjecting it to a specific succession of purification steps. These steps include the photochlorination of the SiCl.sub.4 using a reactor that allows a long residence time for the SiCl.sub.4. After photochlorination, highly volatile products such as HCl are removed and the remaining impurities are then separated by a distillation technique.