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Hydrogen cyanide is then obtained as an aqueous solution by washing with water and followed by distillation and condensation. Flow diagram of the process for the catalytic synthesis of hydrogen cyanide from methane, ammonia and air.
Some recent development in the choice of the catalyst have been reported to produce EDC of high quality which eliminates the need for distillation.This greatly reduces the impact of the side reaction between water and carbon monoxide and consequently improves the selectivity.The overall impact is a less expensive downstream purification process of the acetic acid compared to the technology used in Monsanto process.To be more specific, the new configuration uses a compact two distillation columns configuration.The major units of a commercial scale Cativa methanol carbonylation plant are shown in the following figure. Simplified process flowsheet for a Cativa-based acetic acid plant Posted in: FAQ - Acetic acid Hydrocyanic acid is mainly used for the manufacture of products such as acrylonitrile, adiponitrile, cyanogen chloride, cyanuric chloride, acrylates and methacrylates, cyanide, ferrocyanide, chelating agents (EDTA, ….).
The method which has proved successful for HCN manufacture is based on that described by Andrussow in 1930 which employs methane, ammonia and air at high temperatures (1100-1200°C).