Process for the preparation of aqueous ammonium thiocyanate solutions
AssigneeAkzo N.V.
InventorsGerhard Meyer, Gunter Sudheimer, Hans Zengel, Hans Grothaus
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Abstract
Aqueous ammonium thiocyanate solutions are prepared continuously by reaction of ammonia with carbon disulfide in the presence of water using activated carbon as catalyst at pressures of from 2 to 7 bar. In this way, a very pure product can be obtained. The process can be carried out at very low cost, because both the addition of ammonia to carbon disulfide and the decomposition of the resulting ammonium dithiocarbamate can be carried out in a reactor in one step under identical conditions.
Claims21
A process comprising reacting ammonia with carbon disulfide in the presence of water or a first aqueous ammonium thiocyanate solution and a catalytic amount of activated carbon in a reaction vessel to produce a second aqueous ammonium thiocyanate solution, said ammonia being reacted with said carbon disulfide in a single reaction zone to form intermediate, all of said intermediates being decomposed in situ in said single reaction zone at a temperature of from 90.degree. to 150.degree. C. and a pressure of from 2 to 7 bar.
Dependencies are inferred from the claim text.