Gas purification process

Details Gas purification process Gas purification process

1979-04-18

1980-04-22

Thomas, Earl C.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Carbon dioxide or hydrogen sulfide component

423236, 423366, 423514, B01D 5334

Patent

active

041995538

ABSTRACT:
A process for purifying gases containing hydrogen sulfide and/or hydrogen cyanide is provided wherein said gases are contacted with an absorbing solution containing naphthols or their salts as a catalyst having a nitroso group at .alpha.-position or .beta.-position and also acidic group(s) and also having a standard redox potential in the range of 0.4 V or higher but lower than 0.7 V to remove hydrogen sulfide and/or hydrogen cyanide by converting the former mainly into thiosulfuric acid and the latter mainly into thiocyanic acid. According to this process, no trouble caused by sulfur deposit as seen in conventional method occurs, and the scale of purification apparatus is made smaller, and also the amount of catalyst required for purification is reduced. Further, by pretreating the absorbing solution, this process becomes more advantageous.

REFERENCES:
patent: 3459495 (1969-08-01), Iida et al.
patent: 3937795 (1976-02-01), Hasebe
patent: 4002727 (1977-01-01), Sonoda et al.

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