Method for purifying hydrocyanic acid

Details Method for purifying hydrocyanic acid Method for purifying hydrocyanic acid

2004-04-15

2008-12-09

Manoharan, Virginia (Department: 1797)

Distillation: processes, separatory

Distilling to separate or remove only water

C203S049000, C203S071000, C423S372000, C558S338000

Reexamination Certificate

active

07462263

ABSTRACT:
A process for dewatering hydrocyanic acid by distillation, which includes distilling crude hydrocyanic acid containing from 50 to 99.9% by weight of HCN, from 0.1 to 40% by weight of water, from 0 to 15% by weight of carbon oxides and optionally from 0.01 to 1% by weight of an involatile stabilizer, at a pressure of from 1 bar to 2.5 bar, a bottom temperature of from 100° C. to 130° C. and a top temperature of from 25° C. to 54° C., in the absence of a volatile stabilizer, in a distillation column to obtain a top draw stream containing purified, anhydrous hydrocyanic acid and carbon oxides and a bottom draw stream including water and, optionally, the involatile stabilizer.

REFERENCES:
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patent: 3329582 (1967-07-01), Senneweld et al.
patent: 3920721 (1975-11-01), Gosser
patent: 1 205 064 (1965-11-01), None
patent: 33 34 321 (1985-04-01), None
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patent: 1 396 249 (1975-06-01), None
patent: WO-97/45369 (1997-12-01), None

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