Gas stream treatment process

摘要

A process of treating a gas stream containing mercury and acid gas pollutants is disclosed. The process includes applying a sorbent composition into a gas stream in order to adsorb mercury containing compounds and acid gas pollutants. The sorbent composition includes a compound having the formula (SiO2)x(OH)yMzSaF.B. The combination of basic inorganic solids for the adsorption of acid gases, and metal sulfide-doped silica for the adsorption of mercury provides dual sorbent functionality, along with additional benefits for each individual sorbent: silica for moisture retention on the surface of the basic inorganic particle and adsorption of acid gas, which will improve metal sulfide performance at higher operating temperatures. The use of a hygroscopic solid effectively dries the metal sulfide-doped silica slurry without the use of filtration of drying equipment, providing significant economic benefit for the manufacture of metal sulfide-doped silica material.

主权项

1. A composition comprising a compound having formula (I),
(SiO2)x(OH)yMzSaF.B  (I)wherein
M is a metal or metalloid cation selected from the group consisting of boron, magnesium, aluminum, calcium, titanium, vanadium, manganese, iron, cobalt, nickel, copper, zinc, zirconium, molybdenum, palladium, silver, cadmium, tin, platinum, gold, and bismuth; S is a sulfur-based species selected from the group consisting of at least one of the following: sulfide salts, dithiocarbamates, polymer-based dithiocarbamates, and polysulfide salts; F optionally exists and said F is at least one of the following: a functionalized organosilane, a sulfur-containing organosilane, an amine-containing organosilane, or an alkyl-containing organosilane at a surface area coverage of about 0.01 to about 100%; B is a hydroscopic solid; the molar ratio of y/x is equal to about 0.01 to about 0.5; the molar ratio of x/z is equal to about 0.5 to about 300; and the molar ratio of a/z is about 0.5 to about 5.