| 摘要 |
<p>PROCESS FOR THE REMOVAL OF HYDROGEN CYANIDE Process for the removal of hydrogen cyanide from a gaseous stream containing hydrogen cyanide, comprising the following steps: (a) contacting said gaseous stream in a contact zone with a solution containing ammonium polysulphide to convert hydrogen cyanide into ammonium thiocyanate, thereby producing a solution containing ammonium polysulphide and ammonium thiocyanate, and a gas stream having reduced hydrogen cyanide content; (b) removing at least a portion of the solution containing ammonium polysulphide and ammonium thiocyanate from the contact zone; (c) decomposing ammonium polysulphide and precipitating sulphur in the solution removed in step (b), thereby producing hydrogen sulphide, sulphur and a remaining ammonium thiocyanate-containing solution; (d) removing sulphur from said remaining solution and hydro lyzing the ammonium thiocyanate in said remaining solution, producing ammonia, hydrogen sulphide and carbon dioxide.</p> |
