Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture
Reexamination Certificate
2011-08-30
2011-08-30
Johnson, Edward (Department: 1736)
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
C423S212000, C588S407000
Reexamination Certificate
active
08007748
ABSTRACT:
Perlite, particularly, perlite in powdered form, is employed to adsorb metals and metal compounds from fluids, in particular gases at elevated temperature. Treatment of perlite by boiling with sulfuric acid or suspending in a suspension of sulfur in carbon disulfide has been shown to significantly expand the surface area of perlite, thus increasing the efficiency of the process. In select embodiments, powdered perlite is treated to expand its surface area and injected into a fluid stream, such as flue gas, held for a specific retention period, and removed for subsequent disposal. In other embodiments powdered perlite is provided in an adsorption bed. Fluids containing metals or metal compounds in vapor form are permitted to pass through the adsorption bed until the expanded perlite powder is saturated (exhausted) with the metal and metal compounds adsorbed thereon. The perlite is then replaced, disposing of the exhausted perlite.
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Boddu Veera M.
Ghosh Tushar K.
Hay Kent James
Viswanath Dabir S.
Baugher Jr. Earl H.
Johnson Edward
The United States of America as represented by the Secretary of
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