Process for removal of ammonia, hydrogen sulfide and hydrogen cy

Details Process for removal of ammonia, hydrogen sulfide and hydrogen cy Process for removal of ammonia, hydrogen sulfide and hydrogen cy

1974-01-02

1977-03-22

Thomas, Earl C.

Chemistry of inorganic compounds

Sulfur or compound thereof

Elemental sulfur

423222, 423236, 423238, C01B 1704, B01D 5334

Patent

active

040137791

ABSTRACT:
In the process disclosed, gas from a coke plant is washed with an aqueous metallic salt solution including sulfureous and sulfuric acid to absorb the ammonia, hydrogen sulfide and hydrogen cyanide from the gas. The washing solution is then oxidized in an aerating tank to recover elementary sulfur. A portion of the washing fluid from the oxidizer is returned for continued washing of gas and a portion of the fluid is heated in the presence of a catalyst to yield products of combustion including an acid anhydride and a metal or metal oxide. After processing the combustion products through a heat recovering system, the acid anhydride and metal oxides are combined and react to form renewed aqueous metal salt solution that is combined with the oxidized washing solution to wash additional quantities of gas.

REFERENCES:
patent: 961763 (1910-06-01), Falding
patent: 1160836 (1915-11-01), Burkheiser
patent: 2988430 (1961-06-01), Horner
patent: 3887682 (1975-06-01), Kumata et al.

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