	US 12,268,984 B1
	Process for removing hydrogen sulfide from sour gases with ZIF-8 mixed metal hydroxides composites
Sagheer A. Onaizi, Dhahran (SA)
Assigned to KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS, Dhahran (SA)
Filed by KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS, Dhahran (SA)
Filed on Jul. 15, 2024, as Appl. No. 18/772,460.
Int. Cl. B01D 53/10 (2006.01); B01J 20/22 (2006.01)

CPC B01D 53/10 (2013.01) [B01J 20/226 (2013.01); B01D 2253/204 (2013.01); B01D 2257/304 (2013.01)]

16 Claims

1. A method for removing hydrogen sulfide (H₂S) from a H₂S-containing gas composition, comprising:

adding an aqueous media to a reactor under continuous agitation;

dispersing particles of a composite in the aqueous media to form a composite mixture;

continuously agitating the composite mixture;

introducing the H₂S-containing gas composition to the reactor containing the composite mixture under continuous agitation and passing the H₂S-containing gas composition through the composite mixture; and

adsorbing and removing H₂S from the gas composition by the composite mixture to form a purified gas composition,

wherein the composite comprises:

a XMgAl mixed hydroxide, where X is Zn, Co, Mn, or Cu; and

a zeolitic imidazolate framework-8 (ZIF-8),

wherein particles of the XMgAl mixed hydroxide are dispersed within pores of the ZIF-8, and

wherein the composite is made by a method comprising:

preparing the ZIF-8; and

hydrothermally reacting the ZIF-8 with metal salts of metals in the XMgAl mixed hydroxide to form the composite,

wherein the ZIF-8 has a specific pore volume of 0.3-0.7 m³/g, and a pore size of 0.5-5 nm.