Method for the production of hydrocyanic acid by oxidation...

Chemistry of inorganic compounds – Nitrogen or compound thereof – Carbon containing

Reexamination Certificate

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Details

Other Related Categories

C423S238000, C423S375000

Type

Reexamination Certificate

Status

active

Patent number

10517814

Description

ABSTRACT:
A process is described for preparing hydrogen cyanide by autothermal noncatalytic oxidation of one or more nitrogenous hydrocarbons or a nitrogenous hydrocarbon mixture in which the nitrogenous hydrocarbons, an oxygen-containing gas, with or without ammonia, with or without water, with or without a gas containing nitrogen oxides and with or without other essentially inert feed gas constituents are introduced into a flame reaction zone, react in the flame reaction zone and a post-reaction zone at a temperature of from 1000 to 1800° C. for a reaction time of 0.03 to 0.3 s to form a cleavage gas which comprises at least the constituents hydrogen cyanide, carbon oxides, hydrogen, water, ammonia, nitrogen, light hydrocarbons with or without other cleavage gas constituents, the atomic C/N ratio in the reaction zones being from 1 to 7 and the atomic air ratio λatobeing <0.6, the cleavage gas being cooled and separated.

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Morikawa, Tokio. “Evolution of Hydrogen Cyanide during Combustion and Pyrolysis”, Journal of Combustion Toxicology, vol. 5, pp. 315-330, XP002069700 1978, no month.
Schingnitz, Manfred et al. “Flugstromvergasung”, Umwelt, vol. 29, No. 9 1999, no month.

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