Nitrogen oxide treatment equipment manufacturer - Yellow smoke removal from exhaust gas - Significant effect - Numerous cases

Soak coal columnar activated carbon in a solution containing carbonic acid or sodium bicarbonate, dry it, and place it in a storage tank. The discharged nitrogen oxide waste gas is purified through the storage tank. The exhaust gas containing nitric oxide can pass through a purification tank filled with coal columnar activated carbon, with a temperature below 50 ℃ and a relative humidity of ≤ 50%. Coal based columnar activated carbon can adsorb nitric oxide and be heated to 100-200 ℃ for analysis. This exhaust gas treatment process is suitable for purifying underground exhaust gas, which is discharged by concentrating low levels of nitric oxide.

(4) Chemical properties of nitrogen

① N2 combines with H2 to form NH3: (catalyst, high temperature and high pressure) N2+3H2=2NH3 (principle of industrial ammonia synthesis);

② N2 and O2 combine to form NO: (discharge) N2+O2==2NO (the above reaction occurs in lightning or moving engines);

③ Reacting with vivid metals such as Mg:

(Ignite) N2+3Mg=Mg3N2. The product undergoes double hydrolysis reaction when encountering water: Mg3N2+6H2O=3Mg (OH) 2 ↓+2NH3 ↑;

④ The reason why N2 can be used as maintenance gas is that its chemical properties are not very active.

(5) The use of nitrogen

① Synthesize ammonia to produce nitric acid;

② Replace rare gases as maintenance gases for welding metals to prevent metal oxidation;

③ Fill the bulb with nitrogen to prevent oxidation of the tungsten wire;

③ Save food such as grains and fruits to prevent decay;

④ In medicine, liquid nitrogen is used as a cryogen for anesthesia under frozen conditions;

⑤ Using liquid nitrogen to create a low-temperature environment, such as enabling certain superconducting materials to achieve superconducting properties at low temperatures.

[Explanation]

The process of converting free nitrogen into compound nitrogen is called nitrogen fixation, which can be achieved through natural nitrogen fixation or artificial nitrogen fixation.

① Natural nitrogen fixation: NO gas occurs during thunderstorms

Nitrogen fixation by rhizobia in leguminous plants;

② Artificial nitrogen fixation: synthetic ammonia industry.

2. Nitrogen oxides

The nitrogen element has five positive valences:+1,+2,+3,+4, and+5. The five positive valences correspond to six oxides: N2O (commonly known as "laughing gas" and used for anesthesia), NO, N2O, NO2, N2O3, N2O4, and N2O5 (white solid). N2O3 and N2O5 are the acid anhydrides of HNO2 and HNO3, respectively. They are all air pollutants, and NO2 in the air is the main factor contributing to photochemical smog.

NH3 is a colorless, pungent gas with a higher density than air. It has a lower melting and boiling point, is easily liquefied, and is highly soluble in water. Its aqueous solution is weakly alkaline. At room temperature, one volume of water can dissolve about 700 volumes of ammonia gas. Ammonia has a stimulating effect on mucous membranes such as the eyes, nose, and throat of humans, so be careful when touching. If you accidentally touch too much ammonia and develop symptoms, you should promptly inhale fresh air and water vapor, and rinse your eyes with a lot of water.

(3) Chemical properties

① Reacting with water;

NH3+H2O=NH3 · H2O=NH4++OH - (both reactions can be reversed), the aqueous solution of ammonia is called ammonia water. The particles contained in ammonia water include NH3, H2O, NH3.H2O, NH, H+, OH -. Ammonia water has alkaline properties, such as the ability to turn colorless phenolphthalein solutions red.

② Reacting with acid to generate ammonium salts;

The essence of the reaction is: NH3+H+=NH4+(tetrahedral)

For example: 2NH3+H2SO4=(NH4) 2SO4

The N atom in NH3 molecule has a pair of lone electron pairs, which can form coordination bonds with H+ions with empty orbitals.

③ Has reducibility;

(Catalyst) 4NH3+5O2=4NO+6H2O (Fundamental Reaction for Industrial HNO3 Production)

2NH3+3Cl2=6HC1+N2 (excess Cl2)

8NH3+3Cl2=6NH4Cl+N2 (excessive NH4 can be used to check if there is any gas leakage in the Cl2 bottle)

2NH3+3CuO=N2+3Cu+3H2O (laboratory made N2)

(Catalyst) 6NO2+8NH3=7N2+12H2O

(Catalyst) 2xNH3+3NOx -=(2x+3/2) N2+3xH2O

(Managing nitrogen oxide pollution)

④ Reacting with CO2 to produce urea;

(200atm，180℃) 2NH3 + CO2 = CO(NH2)2 + H2O

⑤ Collaboration response.

Ag+ + 2NH3 = [Ag(NH3)2]+

(4) The use of ammonia

① Ammonia is an important material for the nitrogen fertilizer industry and the production of nitric acid, ammonium salts, soda ash, etc;

② Ammonia is also a commonly used material in organic synthesis industries such as urea production, synthetic fibers, fuels, etc;

③ Ammonia can also be used as a refrigerant.