How to make liquid nitrogen

People may not know much about liquid nitrogen, let alone how to make it. It also plays a very important role in food production. For example, the ice cream we usually like to eat is made with food-grade liquid nitrogen, and some liquid nitrogen biscuits are also made with food-grade liquid nitrogen. Liquid nitrogen is also widely used in clinical practice, for removing moles and freckles, etc. Let us learn about liquid nitrogen and its production.

Liquid nitrogen, liquid nitrogen. It is inert, colorless, odorless, non-corrosive, non-flammable and extremely low temperature. Nitrogen makes up the majority of the atmosphere (78.03% by volume, 75.5% by weight). Nitrogen is inactive and does not support combustion. When vaporizing, it absorbs a large amount of heat and causes frostbite. Nitrogen makes up 78% of air.

At normal pressure, the temperature of liquid nitrogen is -196°C; 1 cubic meter of liquid nitrogen can expand to 696 cubic meters.

Pure gaseous nitrogen at 21°C. Liquid nitrogen is a colorless, odorless, 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. If the temperature is below this, liquid nitrogen will be formed under normal atmospheric pressure; if pressurized, liquid nitrogen can be obtained at a higher temperature.

In industry, liquid nitrogen is obtained by fractional distillation of air. The air is purified and then liquefied under pressure and cooling, and the components in the air are separated based on their different boiling points. There is no problem if human skin comes into direct contact with liquid nitrogen for a moment, but it will only cause frostbite and become irreversible if it exceeds 2 seconds.

Under normal pressure, the temperature of liquid nitrogen is -196°C. 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, 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. If the temperature is below this, liquid nitrogen will be formed under normal atmospheric pressure. If pressurized, liquid nitrogen can be obtained at a higher temperature.

Operation Notes:

1. Closed operation. Closed operation provides good natural ventilation conditions.

2. Operators must undergo special training and strictly abide by operating procedures.

3. It is recommended that operators wear cold-proof clothing and gloves. Prevent gas from escaping into the workplace air.

4. Be careful when loading and unloading to prevent damage to the cylinder and accessories. Equipped with leakage emergency treatment equipment.