Process for separating out noxious substances from gases and exh

Details Process for separating out noxious substances from gases and exh Process for separating out noxious substances from gases and exh

1990-05-02

1993-05-11

Heller, Gregory A.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

423240S, 4232451, B01D 4700, B01J 800, C01B 700, C10H 2300

Patent

active

052099121

ABSTRACT:
A composition for separating out volatile pollutants from gases and exhaust gases consists of calcium hydroxide and water-soluble salts of sulfur-containing compounds, e.g., mercaptans, sulfides, polysulfides, polythionates and thiosulfates, or elementary sulfur which are used in combination with surface-active substances.
Possible ways to produce the composition include adding the sulfur-containing compounds to the quicklime during slaking, to the slaking water, or, subsequent to slaking, to calcium hydroxide.
The compositions are used for removing the volatile heavy metals, particularly mercury, arsenic, cadmium, thallium, antimony and lead, at temperatures ranging from 20.degree. to 400.degree. C. For this purpose, the composition is blown as powder into the exhaust gas stream, and the resultant products are separated out at fabric filters. Upon addition of surface-active substances, volatile organic pollutants are removed simultaneously with the aforementioned inorganic pollutants.

REFERENCES:
patent: 2423689 (1947-07-01), Day
patent: 3826819 (1974-07-01), Orlondini et al.
patent: 3873581 (1975-03-01), Fitzpatrick et al.
patent: 4372927 (1983-02-01), McCollough
patent: 4889698 (1989-12-01), Moller et al.

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