Method of removing mercury-containing contaminations in gases

Details Method of removing mercury-containing contaminations in gases Method of removing mercury-containing contaminations in gases

B - Operations, Transporting

01

D

23/356.5

B01D 53/34 (2006.01)

Patent

CA 1099489

ABSTRACT OF THE DISCLOSURE The present invention relates to a method of removing mercury-containing contaminations from gases by passing the gas to be purified through a filter bed which is devised to make effective gas contact. The method is characterized in that the filter bed is comprised of specific material prepared by binding, onto a carrier substance such as granulated pumice, a sulfurous substance as contamination absorbin agent. The sulfurous substance may be a naturally occurring or synthetic sulfide of lead, cadmium, antimony, arsenic, iron, nickel and zinc and may be subjected to a surface activation pretreatment. The invention is specially adapted to remove contaminations in refinery effluent gases, especially those containing vaporized mercury metal, together with absorption on the filter bed material. The process uses a mechanism by which mercury, which has a high vapour pressure, is converted into its sulfide, which shows very low vapour pressure, by contacting the gas with sulfides of other metals.

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