Abstract: The present invention relates to a kit for improving food shelf life comprising a sheet-like element component and an alkaline component. The sheet-like element component comprises a particulate filler comprising surface-reacted calcium carbonate, a binder and an oxygen scavenger. The oxygen scavenger is a compound comprising at least two phenolic hydroxyl groups, which can be deprotonated by the alkaline component, thus activating the oxygen scavenger. Further aspects of the present invention relate to an activated sheet-like element formed from the inventive kit, a process for the manufacture of a kit for improving shelf life, a process for the manufacture of a sheet-like element component, a process for activating the sheet-like element component, a supply device comprising the activated sheet-like element, a food packaging comprising the activated sheet-like element and the use of the kit or the activated sheet-like element in a food packaging and for prolonging food shelf life.

Abstract: An ammonia-containing gas stream and a hydrogen sulfide-containing gas stream are combusted to a mixture of SO.sub.2 and H.sub.2 S in a ratio of substantially 1:2 in the thermal zone of a sulfur recovery unit by feeding said streams separately to a burner comprising a double-barrelled gun of two concentric tubes, the ammonia-containing gas stream being fed to the inner tube of the gun and the hydrogen sulfide-containing gas stream being fed to the outer tube.