Patent · US Active

Separation of chlorosilanes

US8062483B2 · kind B2 · utility

0Cited by

8References

14Claims

0Family size

Assignee

Dow Corning Corporation · US

Inventors

David Miller · Bartlesville, US
Jonathan David Wineland · Bedford, US
Ora L. Flaningam · Midland, US

Key dates

Filing date	Dec 6, 2006
Grant date	Nov 22, 2011
Priority date	—
Expiry date	Oct 21, 2028

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07F7/20
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Crude chlorosilane streams containing lower-boiling chlorosilanes and higher-boiling chlorosilanes are separated by contacting them with a distillation aid. The lower-boiling chlorosilanes are separated from the crude chlorosilane stream, and then the distillation aid and the higher-boiling chlorosilanes are separated from one another. The distillation aid is a mono-cyano-substituted organic compound, a nitro-substituted organic compound, a mono-cyano-substituted organosilicon compound, a nitro-substituted organosilicon compound, or a mixture thereof. These distillation aids increase the relative volatility of crude chlorosilane streams such as methyltrichlorosilane and dimethyldichlorosilane resulting in improved separation at lower capital and/or fixed costs.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.