PROCESS FOR PRODUCING HYDROCYANIC ACID

The present invention relates to an improved process for producing hydrocyanic acid by reaction of ammonia with methane in which a small amount of at least one sulphur-containing compound corresponding to the general formula R S (S)x-R' is added, in which R and R', which are identical or different, represent a linear or branched alkyl or alkenyl radical containing from 1 to 5 carbon atoms, and x is a number ranging from 1 to 5, to the reactive gas mixture before it passes over the catalyst. The process according to the invention makes it possible to obtain improved yields of HCN. Another subject of the invention relates to the use of the resulting product for producing methionine, acetone cyanohydrin, adiponitrile or sodium cyanide.