How is liquid nitrogen made and how is liquid nitrogen made?

In industry, liquid nitrogen is obtained by air fractionation. After purifying the air, it is liquefied under pressure and cooling, and separated by the different boiling points of each component in the air. There is no problem when the human body is in direct contact with liquid nitrogen, and it will cause frostbite and irreversible after more than 2 seconds.

Operation precautions: closed operation. Closed operation to provide good natural ventilation conditions. Operators must be specially trained and strictly follow operating procedures. It is recommended that the operator wear cold-proof clothing and cold-proof gloves.

We can make liquid nitrogen from air:

It is possible that the production equipment is not perfect. The purity obtained is not high. Let's say we only have nitrogen in the air right now, carbon dioxide.

and oxygen. Then what we have to do is very simple, separate the carbon dioxide from the oxygen.

It is easier to absorb carbon dioxide if sodium hydroxide can be bought.

Just go buy sodium hydroxide, if you can't buy it, don't worry, you can make it yourself. It's relatively simple to make your own sodium hydroxide, find a plastic basin and cover it with something and seal it, and then turn the DC conductance.

Get in. Generally, the household battery is 24V, and the process of conducting electricity into it will not hurt people. This process also produces chlorine gas.

Chlorine is very dangerous, so please keep it safe. The solution left after draining the chlorine is sodium hydroxide solution, which is not too pure, but it is enough to absorb some carbon dioxide. Now we're going to put our air into this hydrogen peroxide solution.

In this way we get a gas that has only nitrogen and oxygen.

The best way to separate nitrogen and oxygen is to turn one into a liquid, as they have different melting points. Industry can use machines to make a lot of pressure, if a small partner wants to make it, Leng Yan has a way, but the price is relatively expensive. In the past, Acorn once went to borrow a glass box from a friend, which is the kind of glass box in our laboratory, and the sealing conditions of those boxes are relatively good, and there is only one place where gas can be entered.

Then connect a pump-type Liang Qingmu device to pass a large amount of gas into the glass box, and then compress the gas in the box.

Liquid nitrogen is produced in an air separation plant by air liquefaction and distillation, where the air is liquefied at high pressure, the mixed components are rectified, and then the nitrogen is used as a cryogenic liquid**.

Liquid nitrogen is an inert, colorless, odorless, non-corrosive, non-flammable, extremely low temperature gas, nitrogen constitutes the great bend of the atmosphere, nitrogen is inactive, does not support combustion, but nitrogen is a necessary element to sustain life.

At atmospheric pressure, the liquid nitrogen temperature is 196, and 1 cubic meter of liquid nitrogen can expand to 696 cubic meters of pure gaseous nitrogen at 21°C. Liquid nitrogen is a colorless, odorless, and low-temperature liquid and gas under high pressure. Liquid nitrogen (often written as LN2) is the liquid form of nitrogen formed at low temperatures.

The boiling point of nitrogen is -196°C, and liquid nitrogen will be formed if the temperature is below this at normal atmospheric pressure, and liquid nitrogen can be obtained at higher temperatures if pressurized.

Precautions for operation:

1. Closed operation. Closed operation to provide good natural ventilation conditions.

2. The operator must be specially trained and strictly abide by the operating procedures.

3. It is recommended that the operator wear cold-proof clothing and cold-proof gloves. Prevent gas leakage into the workplace air.

4. Light loading and unloading during handling to prevent damage to cylinders and accessories. Equipped with emergency equipment for spill treatment.

The international well-known brand air compressor is used as the main component of the air compression unit, which has the characteristics of low vibration, low noise, stable operation and high weather resistance;

The international advanced multi-stage air treatment process and forced sewage discharge scheme are adopted, the air treatment effect is better and more stable, and the service life of the membrane pack can be effectively prolonged.

Using the world's advanced hollow fiber membrane separation technology and Jereh's original membrane pack retention technology, the nitrogen separation efficiency is high, and the gas production is stable and adjustable, which can meet the demand for nitrogen under various working conditions.

Equipped with the international advanced horizontal opposed multi-stage cylinder compressor, and the unit is analyzed for pulsation, torsional vibration, etc., the equipment operation is more stable, the pressurization performance is more reliable, and the continuous operation time is longer;

If it is poisonous, there will be no one on the earth, and the air has the highest proportion of nitrogen, and to get liquid nitrogen, nitrogen needs to be pressurized and cooled.

Industrially, it is pressurized at low temperatures to convert the air into liquid air and then evaporate. Since the boiling point of liquid nitrogen is 196 (77K), which is lower than that of liquid oxygen, nitrogen first evaporates from the liquid air.

Then nitrogen can be obtained by collection, and then liquid nitrogen can be obtained by cooling and pressurizing.

Dry ice with 90 percent pure alcohol.