Process for the separation of hydrogen cyanide from gases and wa

Details Process for the separation of hydrogen cyanide from gases and wa Process for the separation of hydrogen cyanide from gases and wa

1992-05-06

1993-04-06

Heller, Gregory A.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

436150, C01C 300, G01N 2508

Patent

active

052001610

ABSTRACT:
A process is disclosed for the separation of hydrogen cyanide from gases and waste gases by a throughflow or circulation scrubbing, in which formaldehyde is added at a controlled rate to the aqueous scrubbing liquid to form glycol nitrile. This addition is controlled by measuring the HCN tension in a measuring stream which has been branched off and which is first treated with hydrogen peroxide so that free H.sub.2 O.sub.2 is still detectable after 1 to 100 seconds and the pH is adjusted to a constant value before measurement of the HCN tension is carried out. The process prevents overdosing with formaldehyde which could not always be prevented in previously known processes in which the addition of formaldehyde was regulated by measuring the cyanide specific redox potential.

REFERENCES:
patent: 2859090 (1958-11-01), Karchmer et al.
patent: 4172880 (1979-10-01), Tzavos
patent: 4731232 (1988-03-01), Fischer et al.
patent: 4844874 (1989-07-01), de Vlies

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