Some applications of nitrogen in daily life;
① Anti-corrosion and grain storage
Why do factories usually fill puffed food, such as potato chips, with nitrogen instead of air? Initially, the purpose of inflation was to extend the shelf life and ensure that food would not go bad. There is oxygen in the air, which will make food oxidized and deteriorated, so it is not suitable for inflation. Nitrogen is a very common protective gas. Nitrogen is chemically inert and difficult to react with other substances at room temperature, so it is widely used in the manufacture of preservatives and also suitable for inflatable packaging.
In addition, the use of nitrogen can make grains drowsy and anoxic, slow down metabolism and prevent food from becoming moldy. Therefore, many areas in China also use nitrogen fertilizer to store grain, which is called "vacuum nitrogen storage grain".
② Use light bulbs in museums.
When the bulb works, the temperature of the internal tungsten filament rises, which reacts with the residual oxygen in the bulb to oxidize the filament. Therefore, we often use it because it is "withdrawn", low in activity and difficult to react with filament at high temperature.
Filling nitrogen into the lamp can prevent the oxidation of tungsten wire, slow down the evaporation speed of tungsten wire and prolong the life of the lamp. Similarly, in museums, some valuable paintings and calligraphy are often kept in bottles filled with nitrogen, which may cause moths to die of lack of oxygen.
The chemical reaction of nitrogen can produce substances needed by human beings. We often use nitrogen to synthesize ammonia, which is an important raw material for synthetic fiber, resin and rubber. Ammonia is produced under the action of high temperature, high pressure and catalyst. The reaction formula is N2 versus 3H2 2H3.
Instructions for safe filling of nitrogen gas:
The bottled gas after filling should be checked one by one by a special person in charge. If the inspection does not meet the requirements, it needs to be handled in time. Check whether the gas pressure in the gas cylinder is within the specified range. Whether the gas purity in the cylinder is within the specified range. Whether the connection between the bottle valve and the bottle mouth is well sealed. After the gas cylinder is filled with gas, are there any serious defects that affect the safety of use, such as foaming and deformation?