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| 1. |
What is oxygen scavenger ? Discuss with two examples. |
| Answer» Oxygen scavengers or oxygen absorbers are added to enclosed packaging to help remove or decrease the level of oxygen in the package. They are used to help maintain product safety and extend shelf life.There are many types of oxygen absorbers available to cover a wide array of applications.A chemical that reacts with dissolved oxygen (O2) to reduce corrosion, such as sulfite (SO3-2) and bisulfite (HSO3-) ions that combine with oxygen to form sulfate (SO4-2). This is a redox reaction and requires a nickel or cobalt catalyst. Removal of air from a mud by defoaming and mechanical degassing is an essential first step before a scavenger can lower the dissolved oxygen content. | |