Separation of chlorosilanes

Details Separation of chlorosilanes Separation of chlorosilanes

2006-12-06

2011-11-22

Caldarola, Glenn (Department: 1771)

Distillation: processes, separatory

Adding material to distilland except water or steam per se

Organic compound

C556S466000

Reexamination Certificate

active

08062483

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.

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