Composition for absorbing nitrogen oxide from tobacco smoke, method for absorbing nitrogen oxide using said composition, filter for purifying tobacco smoke using said composition, and method for impregnating the base of a filter with said composition
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United States of America Patent
Stats
-
Jan 28, 1992
Grant Date -
N/A
app pub date -
Jul 14, 1989
filing date -
Jul 15, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention consists of a method for absorbing nitrogen oxide and carbon monoxide from tobacco smoke. It includes a base made of acetate, cellulose and acetate-cellulose fibers. The base is impregnated with an absorbing agent, and the absorbing agent may include a complex compound of ferrous iron and thiol-containing low-molecular ligands. A method for impregnating the base of the filter with the absorbing agent comprises immersing the base in an aqueous suspension of a complex compound of ferrous iron and thiol-containing low-molecular ligands and then drying it; or, treating the base with an aqueous solution of a thiol-containing low-molecular ligand, treating the resulting compound with an aqueous solution of ferrous salts and then drying the resulting compound. A composition for absorbing nitrogen oxide and carbon monoxide from smoke comprises a complex compound of ferrous iron and thiol-containing low-molecular ligands. A method of removing nitrogen oxide and carbon monoxide from smoke consists of passing the smoke through an absorbing agent consisting of a complex compound of ferrous iron and thiol-containing low-molecular ligands.
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