초록 ▼

H2S is removed from a stream of gas such as coal gas at a relatively elevated temperature (300°-400°F.) in a process which employs sulfates or hydroxides of nickel, iron, or zinc as sulfur absorbents. The absorbents are converted to metal sulfides during the absorption process and are regenerated by

H2S is removed from a stream of gas such as coal gas at a relatively elevated temperature (300°-400°F.) in a process which employs sulfates or hydroxides of nickel, iron, or zinc as sulfur absorbents. The absorbents are converted to metal sulfides during the absorption process and are regenerated by aeration. Acids produced during sulfur absorption and absorbent regeneration steps are neutralized through the addition of a base. In a preferred embodiment ammonia is also removed and elemental sulfur is produced during the process.

대표청구항 ▼

A process for removing hydrogen sulfide from a gaseous stream comprising the steps of: (a) providing an aqueous solution at a pH of between 2 and 12, said solution containing at least one reactive metal compound therein the metal of which is selected from the group consisting of nickel, iron and zin

A process for removing hydrogen sulfide from a gaseous stream comprising the steps of: (a) providing an aqueous solution at a pH of between 2 and 12, said solution containing at least one reactive metal compound therein the metal of which is selected from the group consisting of nickel, iron and zinc; (b) removing hydrogen sulfide from said gaseous stream by contacting the same with said aqueous solution at a temperature of between 300°and 400°F. in a closed vessel to form a resulting solution having a metal sulfide reaction product therein and a resulting gaseous stream depleted in hydrogen sulfide; (c) removing said resulting gaseous stream from said contact; (d) regenerating said reactive metal compound provided in the aqueous solution in step (a) from said metal sulfide reaction product by aerating at least a portion of said resulting solution with an oxygen-containing gas while maintaining the pH level of said resulting solution at between approximately 2 to 12.