| abstract |
Present invention relates to a process and an installation (100) for the preparation of hydrogen cyanide by the Andrussow process, and more precisely for improving the conditions of mixing the reactant gases before feeding the Andrussow type reactor (60), in order to improve safety, to avoid any risk of explosion and to produce HCN in safe and efficient manner. The installation is configured in such a manner that oxygen is pre-mixed with air with a ratio comprised between 20,95% and 32,5% by volume, preferably between 25% and 30,5% by volume; methane containing gas and ammonia are simultaneously added in the pre-mixture of oxygen-enriched air in such a manner that the volumic ratio of methane to ammonia is comprised between 1,35 and 1,02 depending on the content of oxygen into air; said obtained reactant gases mixture having a temperature comprised between 80°C and 120°C, preferably between 95°C and 115°C for feeding the Andrussow type reactor (60). |