| Product | Nitrogen |
| Molecular formula: | N2 |
| Molecular weight: | 28.01 |
| Harmatic ingredients: | Nitrogen |
| Health hazards: | The nitrogen content in the air is too high, which reduces the voltage pressure of the inhalation air, causing hypoxia and suffocation. When the concentration of nitrogen inhalation is not too high, the patient initially felt chest tightness, shortness of breath, and weakness; then there was irritability, extreme excitement, running, shouting, unhappy, and unstable gait. Or a coma. Inhale high concentration, patients can quickly coma and die due to breathing and heartbeat. When the diver replaces deeply, the anesthesia effect of nitrogen can occur; if it is transferred from a high pressure environment to the normal pressure environment, the nitrogen bubble will form in the body, compress the nerves, blood vessels, or cause badge blood vessel obstruction, and “decompression disease” occurs. |
| Burning danger: | Nitrogen is non -flammable. |
| Inhale: | Quickly get out of the scene to fresh air. Keep the respiratory tract open. If breathing is difficult, give oxygen. When the breathing heartbeat stops, immediately perform artificial breathing and chest heart pressing surgery to seek medical treatment. |
| Dangerous characteristics: | If it encounters high fever, the internal pressure of the container increases, and it is in danger of cracking and explosion. |
| Harm combustion products: | Nitrogen Gas |
| Fire extinguishing method: | This product is not burning. Moles the container from the fire to the open area as much as possible, and the water spraying the fire container cools until the end of the fire is ended. |
| Emergency treatment: | Quickly evacuate personnel in the leakage of pollution areas to the upper winds, and isolate, strictly restricting entry and exit. It is recommended that emergency treatment personnel wear self -sufficient positive respirators and general work clothes. Try the leak source as much as possible. Reasonable ventilation and accelerate spread. The leakage container should be properly handled, and then used after repair and inspection. |
| Operation precautions: | Concerned operation. Concerned operations provide good natural ventilation conditions. The operator must strictly abide by the operating procedures after special training. Prevent gas leakage to the air in the workplace. Drink and lightly unload during handling to prevent damage to the cylinders and accessories. Equipped with leak emergency treatment equipment. |
| Storage precautions: | Store in a cool, ventilated warehouse. Stay away from fire and heat. Kuken should not exceed 30 ° C. There should be leakage emergency treatment equipment in the storage area。 |
| TLVTN： | ACGIH Suffocation gas |
| engineering control: | Concerned operation. Provide good natural ventilation conditions. |
| Respiratory protection: | Generally no special protection is required. When the oxygen concentration in the air in the operating venue is less than 18 %, we must wear air respirators, oxygen respirators or long tube masks |
| Eye protection: | Generally no special protection is required. |
| Physical protection: | Wear general work clothes. |
| Hand protection: | Wear general work protection gloves. |
| Other protection: | Avoid high concentration inhalation. Entering tanks, limited spaces or other high concentration areas must be monitored. |
| Main ingredients: | Content: high -pure nitrogen ≥99.999 %; industrial level first level ≥99.5 %; secondary level ≥98.5 %. |
| Appearance | Colorless and odorless gas. |
| Melving point (℃): | -209.8 |
| Boiling point (℃): | -195.6 |
| Relative density (water = 1): | 0.81(-196℃) |
| Relatively steam density (air = 1): | 0.97 |
| Saturated steam pressure (KPA): | 1026.42(-173℃) |
| Burning (kj/mol): | pointless |
| Critical temperature (℃): | -147 |
| Critical pressure (MPA): | 3.40 |
| Flash point (℃): | pointless |
| Burnning temperature (℃): | pointless |
| The upper limit of explosion: | pointless |
| The lower limit of explosion: | pointless |
| Solubility: | Slightly soluble in water and ethanol. |
| Main purpose: | Used to synthesize ammonia, nitric acid, used as a material protective agent, frozen agent. |
| Acute toxicity: | Ld50: No information LC50: No information |
| Other harmful effects: | No information |
| Abolition disposal method: | Please refer to relevant national and local regulations before disposal. The exhaust gas is directly discharged into the atmosphere. |
| Dangerous cargo number: | 22005 |
| UN number: | 1066 |
| Packaging category: | O53 |
| Packing method: | Steel gas cylinder; ordinary wooden boxes outside the ampoule bottle. |
| Precautions for transportation: |
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How to get high purity nitrogen gas from Air？
1. Cryogenic Air Separation Method
The Cryogenic separation method has gone through more than 100 years of development, and has experienced a variety of different process processes such as high voltage, high and low voltage, medium pressure, and full low voltage process. With the development of modern air score technology and equipment, the process of high -voltage, high and low pressure, and medium -voltage vacuum has been basically eliminated. The lower low -pressure process with lower energy consumption and safer production has become the first choice for large and medium -sized low -temperature vacuum devices. The full low -voltage air division process is divided into external compression processes and internal compression processes according to the different compression links of oxygen and nitrogen products. The full low -pressure external compression process produces low -pressure oxygen or nitrogen, and then compresses the product gas to the required pressure to supply the user through an external compressor. Full pressure in the low -pressure compression process The liquid oxygen or liquid nitrogen generated by distilled distillation is accepted by liquid pumps in the cold box to vaporize after the pressure required by the user, and the user is supplied after re -heat in the main heat exchange device. The main processes are filtering, compression, cooling, purification, supercharger, expansion, distillation, separation, heat -reunion, and external supply of raw air air.
2. pressure swing adsorption method (PSA method)
This method is based on compressed air as the raw material. Generally, molecular screening is used as the adsorbent. Under certain pressure, the difference in the absorption of oxygen and nitrogen molecules in the air in different molecular sieves is used. In the collection of gas, the separation of oxygen and nitrogen is implemented; and the molecular sieve absorbing agent analyzed and recycled after the pressure removal.
In addition to molecular sieves, adsorbents can also apply alumina and silicone.
At present, the commonly used transformer adsorption nitrogen making device is based on compressed air, carbon molecular sieve as the adsorbent, and uses the differences in the adsorption capacity, adsorption rate, adsorption force of oxygen and nitrogen on carbon molecular sieves and Different stress has different adsorption capacity characteristics to achieve oxygen and nitrogen separation. First of all, oxygen in the air is prioritized by carbon molecules, which enriches nitrogen in the gas phase. In order to obtain nitrogen continuously, two adsorption tower is required.
Application
1. The chemical properties of nitrogen are very stable and generally do not respond to other substances. This inertial quality allows it to be widely used in many anaerobic environments, such as using nitrogen to replace the air in a specific container, which plays a role in isolation, flame retardant, explosion -proof, and anticorrosion. LPG engineering, gas pipelines and liquefied bronchial networks are applied to the application of industries and civilian use [11]. Nitrogen can also be used in the packaging of processed foods and medicines as covering gases, sealing cables, telephone lines, and pressurized rubber tires that can be expanding. As a kind of preservative, nitrogen is often replaced with underground to slow down the corrosion generated by the contact between the tube column and the stratum fluid.
2. High -purity nitrogen is used in metal melting casting process to refine the metal melt to improve the quality of casting blank. Gas, it effectively prevents the high temperature oxidation of copper, keeps the surface of the copper material, and abolish the pickling process. The nitrogen -based charcoal furnace gas (its composition is: 64.1%N2, 34.7%CO, 1.2%H2 and a small amount of CO2) as a protective gas during copper melting, so that the copper melt surface is used product quality.
3. About 10%of the nitrogen produced as a refrigerant, mainly includes: usually soft or like rubber -like solidification, low -temperature processing rubber, cold contraction and installation, and biological specimens, such as blood preservation of blood Cool in transportation.
4. Nitrogen can be used to synthesize nitric oxide or nitrogen dioxide to create nitric acid. This manufacturing method is high and the price is low. In addition, nitrogen can also be used for synthetic ammonia and metal nitride.