How to make pure oxygen, how to produce oxygen in an oxygen plant

Materials: AC to DC power adapter, copper wires (several), discarded dry battery (carbon), salt water, empty Coke bottle (two), plastic basin;

The method of "electrolysis of salt water" for the production of oxygen and the "drainage gas collection method" for gas collection.

Peel out the carbon rod electrode from the discarded carbon dry battery, connect the two poles of the output end of the DC power adapter with wires respectively, fill the cola bottle with salt water, and turn it into a plastic basin filled with salt water, insert a carbon rod electrode at the mouth of the bottle, turn on the power supply, and after a period of power, the gas in the bottle with less gas volume is oxygen. The other bottle is filled with hydrogen, so be careful to keep it away from the fire when operating.

PS: Anyway, the production of oxygen is generally part of chemistry, and you started chemistry classes in the first year of junior high school? We didn't learn until the third year of the new year.

PS2: Although there are also physical methods in the industry to produce less pure oxygen, but it is necessary to use pressurization and cooling methods to cool the air to more than minus 200 degrees Celsius, which is impossible for household equipment to do, so I will not go into details.

In daily necessities, and at home, the laboratory table is considered a kitchen.

These conditions will certainly not be possible.

The materials and methods mentioned above are more or less to buy some ordinary raw materials and equipment.

Just make pure oxygen in the school laboratory, don't be impulsive.

Just use H2O2 and MNO2, which can be used in plastic bottles, and there is no corrosive effect on plastics, and glass can also be used. Pay attention to adjust the concentration, the general industrial is 30%, too strong, adjust to about 3%, the pharmacy is 3%, you can use it directly. Add a small amount of mno2, and a small amount must be small, otherwise the speed will not be easy to control.

To prevent overheating, the bottle can be cooled in water.

When it comes to safe production of pure oxygen, it can be made with hydrogen peroxide (H2O2) and catalyst (MNO2)! Add H2O2 and Mno2 to the tube, and when bubbles appear, start collecting! Hydrogen peroxide is a commonly used medicine in daily life!

If you don't have manganese dioxide, you can heat it directly with an alcohol lamp! You can also get oxygen!

Industrially: pressurize the air, cool it, and separate the liquid air through the different boiling points of various substances in the air;

Laboratory method: mix hydrogen peroxide (commonly known as hydrogen peroxide) solution and manganese dioxide to generate oxygen and water; Potassium chlorate and manganese dioxide are mixed and heated to produce potassium chloride and oxygen; Potassium permanganate is heated to produce potassium manganate, manganese dioxide and oxygen. The oxygen generated is collected by the drainage method or the upward exhaust air method.

There should be an experimental class of electrolyzed water in junior high school, you haven't learned it yet, and then the teacher will let you do the experiment by yourself. Really fun.

To produce oxygen, pure oxygen is obtained, and no other gaseous substances are generated in the first production process, and the second is to remove impurities. The chemical reagents used to obtain pure oxygen are hydrogen peroxide and potassium permanganate.

It is best not to use potassium chlorate and manganese dioxide.

Because the two reactions have to go through a series of complex reactions, there may be a small amount of gaseous substances generated in the intermediate reaction of this oversized judgment process, as shown in the figure

Taking hydrogen peroxide to oxygen as an example, device 2 is a water removal device, device 3 is a collection device, and device 4 is a water connection device. Vegetable oil is added to the surface of the water in the collection device to prevent the water from evaporating and mixing water vapor with oxygen.

1. Heat potassium permanganate.

The equation for the thermal decomposition of potassium permanganate is controversial because its decomposition products will vary under different temperature conditions.

Reaction equation at the secondary school level.

2kmno = k mno + mno +o heating).

2. Potassium chlorate decomposition of limb friends.

The prepared oxygen contains a small amount of Cl, O and a trace amount of Clo; The reaction is actually an exothermic reaction, not an endothermic reaction, and the above 1mol reaction occurs, and the exothermic reaction is 108kJ

2kCl = 2kCl + 3O mNo catalytic heating).

3. Hydrogen peroxide decomposition.

Catalytic decomposition of hydrogen peroxide solution (the catalyst in Xuzhen is mainly manganese dioxide, and ferric oxide and copper oxide can also be used).

2H O ==2H O + O MNO Catalysis).

Oxygen production method:

1. Heating potassium permanganate: potassium permanganate generates potassium manganate, manganese dioxide and oxygen under heating conditions.

2. Separation of liquid air method.

Pressurized at low temperatures, the air is transformed into a liquid state, and then evaporated, since the boiling point of liquid nitrogen is 196, which is lower than the boiling point of liquid oxygen (183), so nitrogen first evaporates from liquid air, and the rest is mainly liquid oxygen.

3. Membrane separation technology.

Membrane separation technology has developed rapidly. Using this technology, oxygen-rich air with a high oxygen content can be obtained by passing air through a membrane with oxygen-enriching function at a certain pressure. Using this membrane for multi-stage separation, oxygen-rich air with more than 90% oxygen can be obtained.

4. Molecular sieve oxygen production method (adsorption method).

Taking advantage of the fact that nitrogen molecules are larger than oxygen molecules, special molecular sieves are used to separate oxygen from the air.

First of all, the compressor is used to force the dry air to enter the adsorber of the vacuum through the molecular sieve, the nitrogen molecules in the air are adsorbed by the molecular sieve, and the oxygen enters the adsorbber, and when the oxygen in the adsorber reaches a certain amount (the pressure reaches a certain level), the oxygen valve can be opened to release the oxygen.

5. Catalytic decomposition of hydrogen peroxide solution: generation of water and oxygen.

One is potassium permanganate heating to prepare oxygen; 2mno4= heating = k2mno4 + mno2 = o2

One is potassium chlorate added to the catalyst MNO2 to prepare oxygen. 2clo3 = mnO2, heating = 2kCl + 3O2

There should be a lot of hydrogen peroxide decomposition ,,, air liquefaction and separation of oxygen ,,,, and I can't remember it for a while.

Oxygen can also be produced by electrolysis of water, and hydrogen is also produced.

Laboratory Method:

1. Heating potassium permanganate, the chemical formula is: 2kmNO4 = heating = K2mNO4 + MNO2 + O2

2 Potassium chlorate is heated with a catalyst-manganese dioxide, the chemical formula is: 2kclo3=mno2 catalyzed and heated = 2kCl+3O2 (some textbooks have been deleted) It is important to note that this reaction is actually an exothermic reaction, not an endothermic reaction. 2kclo3 = 2kCl + 3O2, the unit of reaction heat release has been discarded, and it is converted by itself).

3 The hydrogen peroxide solution is used in the catalyst manganese dioxide to generate O2 and H2O, and the chemical equation is: 2H2O2=Mno2= 2H2O+O2

In addition, the decomposition of sulfur trioxide can also produce oxygen, the decomposition of hypochlorous acid can also produce oxygen, and the electrolysis of water.

Methods of Industrial Manufacturing of Oxygen:

Compressed cooling air.

Oxygen plants generally use the low-temperature separation air method to produce oxygen. It is mainly divided into air pressurization system, air purification system, heat exchange system, distillation system and backup system. Its principle is to use the pressurized medium (generally air, but also nitrogen) to expand and refrigerate, produce cold energy, throttle heat exchange, liquefy the air into liquid, form rising steam and reflux liquid in the distillation system, and establish distillation conditions.

Oxygen plants generally use the low-temperature separation air method to produce oxygen. It is mainly divided into several major parts: air pressurization system, air purification system, heat exchange system, distillation system and backup system. Its principle is to use the pressurized medium (generally air, but also with nitrogen) to expand and refrigerate, produce cold energy, through throttling heat exchange, liquefy the air into liquid, form rising steam and reflux liquid in the distillation system, establish distillation conditions, and then use the liquid air oxygen boiling point (-183) and nitrogen boiling point (-196) different, the rising steam and the reflux liquid mass transfer heat transfer, the oxygen in the rising steam is cooled to the back to the hail flow, the nitrogen in the reflux liquid is evaporated into the rising steam, after many times of distillation, When the oxygen content in the reflux liquid infiltrates the locust body reaches or even higher, and the nitrogen content in the rising steam reaches it, high-purity nitrogen and liquid oxygen will be obtained.

Liquid oxygen is vaporized through plate heat exchange to become the required oxygen.