Care should be taken when storing and using flammable chemical reagents

Precautions for the storage and use of flammable chemical reagents: 1. Store separately in a cool and ventilated place 2, use an explosion-proof refrigerator in the refrigerator 3, keep away from the fire source, and never use an open flame for heating.

The management of chemical reagents must require managers to have professional knowledge of chemical reagent management. Including the characteristics of commonly used reagents, uses, general safety requirements, first aid measures, disposal of waste reagents and fire knowledge, etc. Strict management of chemical reagents can ensure the smooth progress of experiments, which is an important part of laboratory safety.

When storing and using flammable chemical reagents, it should be noted that flammable and explosive chemical reagents must be stored in a special dangerous reagent warehouse, and stored in cabinets and shelves made of non-combustible materials, and the temperature should not exceed 28, and the "five pairs" system shall be implemented according to the regulations.

A small number of bottles in the laboratory can be set up with a special counter for dangerous goods, which can be stored in separate compartments according to their nature, and shall not be mixed with contradictory products such as oxidants in the same compartment, and shall be equipped with corresponding fire extinguishing equipment and automatic alarm devices according to the type of storage. Low boiling point and extremely flammable reagents should be stored at low temperature (below 5, it is forbidden to store in ordinary household refrigerators with electric sparks.)

Generally, chemical reagents with a flash point of less than 25 are included in flammable chemical reagents, which are mostly highly volatile liquids that can be burned in case of open flame. The lower the flash point, the more flammable. When using flammable chemical reagents, an open flame should never be used, and heating should not be done directly with a heater, and it is generally not heated with a water bath.

Experimenters working with flammable chemical reagents should wear the necessary protective equipment, preferably protective glasses.

Sogou asked. Extended Materials.

As for radiochemical reagents:

When using such chemical reagents, it is necessary to take protective measures according to the method of using radioactive substances. Other types of dangerous chemical reagents, whether commonly used or not, must understand the precautions for safe use before use.

In the process of chemical experiments, accidents will inevitably occur due to improper operation or negligence. The problem is to have a correct attitude and a cool head when encountering an accident, so as not to panic, second, to deal with it in a timely and correct manner, and third, to operate according to the requirements and to avoid accidents as much as possible.

For example, when concentrated sulfuric acid is diluted, concentrated sulfuric acid should be slowly injected into water along the inner wall of the container, stirring while adding to evenly diffuse the heat. In experiments with toxic gases, they should be carried out in a fume hood as much as possible. If you accidentally get phenol on your hands, you should immediately scrub it with alcohol, then rinse it with water, etc.

When storing, try to isolate the air or use a brown bottle. When using, keep dry, away from fire, avoid contact with hot objects, and use tweezers or keys. Different flammable chemical agents are stored and used in different ways.

For example, the most common are white phosphorus, red phosphorus, lithium, sodium, potassium. Sodium can be sealed with paraffin when stored and kept away from water when used.

Use a fire extinguisher or add sand to extinguish the fire.

The combustion of solvents or flammable chemicals in the container can be extinguished with a fire extinguisher or sand, or covered with asbestos cloth and filled with sand. In doing so, the contact surface between the combustible material and oxygen is blocked, and the fire is extinguished.

A solvent is a liquid (gas, or solid) that can dissolve solids, liquids, or gaseous solutes, (solvents and solutes can be solids, liquids, gases), and then become solutions. The most prevalent solvent in everyday life is water. Organic solvents are organic compounds that contain carbon atoms.

Solvents usually have a relatively low boiling point and are volatile.

Description of features:

Solvents don't have to be liquids. Solvents and solutes can be solids, liquids, and gases. A solvent is a liquid (gas, or solid) that can dissolve solids, liquids, or gaseous solutes to become a solution. The most prevalent solvent in everyday life is water.

Solvents usually have a relatively low boiling point, and solvents cannot react chemically to solutes. Solvents are usually clear, colorless liquids, and most of them have a distinctive odor. The concentration of the solution depends on the amount of substance dissolved in the solvent.

Solubility is the maximum amount of substance that a solvent can dissolve at a given temperature.

The ideal storage temperature for flammable chemical reagents is -4 4, and the maximum allowable room temperature should not exceed 30.

Flammable reagents, which are not only flammable, but may also trigger when burning intensely**. Some solid chemical reagents, such as: nitrocellulose, picric acid, trinitrotoluene.

Trinitrobenzene, azide or overlapping compounds, hoxylates, etc.

They themselves are easy to explode and burn, and when exposed to heat or open flames, they are very easy to burn or decompose, resulting in **. Therefore, when using these chemical reagents, they must not be heated directly, and when using these chemical reagents, they should also be careful not to have open flames around.

Exposure to air can**.

In addition to the solid chemical reagents that are easy to cause when exposed to water and fire, there are also some solid chemical reagents that can have a strong oxidation effect when they come into contact with air; Such as yellow phosphorus, there are also some contact with oxidants or in the air heat, impact or friction can also lead to rapid combustion, or even **.

For example, the stool is made of phosphorus sulfide, red phosphorus magnesium powder, and zinc powder.

When using these chemical reagents, you must pay attention to the ambient temperature not to be too high (generally not more than 30 degrees Celsius.

Preferably below 20 degrees Celsius) do not come into contact with strong oxidizing agents.

This kind of reagent reacts very violently with water, including potassium, sodium, lithium, calcium, and aluminum chloride.

Lithium, calcium carbide. Wait. Potassium and sodium should be stored in kerosene, which is actually very easy to have nitric acid.

Fiber picric acid, trinitrotoluene, trinitrobenzene, azide or diazo compounds, etc., should be handled with care.

It is only advisable to store a small amount of drugs that need to be used in the short term in the laboratory, and the flammable and explosive reagents of the Yisouhe stool should be placed in an iron cabinet, and there should be a vent at the top of the cabinet. And flammable and explosive materials should be kept away.

In the cool and ventilated place of the laboratory, a small amount of flammable and explosive reagents stored in the laboratory should be strictly managed.

Isolated storage: flammable, highly toxic, highly corrosive, low-temperature storage, etc. Laboratory and warehouse management personnel are required to have certain relevant knowledge. Store in a ventilated, cool, and temperature-below 30 medicine cabinet.

Some medicines are easy to decompose when exposed to light and are stored in the dark. Solids, liquids, acids, and alkalis are placed separately.

Only a small amount of drugs that need to be used in the short term should be stored in the laboratory, and flammable and explosive reagents should be placed in an iron cabinet, and there should be a vent at the top of the cabinet. In addition, flammable and explosive materials should be placed in a cool and ventilated place away from the laboratory, and a small amount of flammable and explosive reagents stored in the laboratory should be strictly managed.

Isolated storage: flammable, highly toxic, highly corrosive, low-temperature storage, etc. Laboratory and warehouse management personnel are required to have certain relevant knowledge. Store in a ventilated, cool, and temperature-below 30 medicine cabinet.

Some medicines are easy to decompose when exposed to light, and should be stored in the dark and stored on the stool. Solids, liquids, acids, and alkalis are placed separately.

The ideal storage conditions for flammable chemical reagents are -4 4 °C, and the maximum should not exceed 30 °C.

1) Flammable and explosive reagents:

Flammable (commonly used such as acetone.)

Ether, ethanol.

isopropanol, etc.).

Explosive (such as picric acid, sodium azide, etc.) reagents.

When storing, it should be kept away from fire, in a cool and well-ventilated place. And should be tightly sealed, can not be mixed with strong oxidants together, explosive reagents can be stored in the refrigerator, storage room temperature should be below 30.

2) Corrosive reagents:

There are sulfuric acid, glacial acetic acid.

Acetic anhydride and nitrate crack are acid resistant.

Bromine, ammonia, etc.

It can burn** and even cause tissue necrosis.

Therefore, during storage or handling, it is necessary to avoid the rupture of the container mold caused by impact or strong vibration. Corrosion-resistant materials should be selected as shelves for storage.

3) Highly toxic reagents:

Such as cyanide, arsenic trioxide, mercuric chloride, dimethyl sulfate, etc. Blocking the spring.

A special person should be designated to lock the counter for safekeeping, and strictly register the application system.

Summary. Before using a hazardous chemical, it is important to understand the characteristics and precautions of the chemical through the safety label and safety data sheet.

Before using hazardous chemicals, it is necessary to understand the characteristics and precautions of the chemical.

Before using a hazardous chemical, it is important to understand the characteristics and precautions of the chemical through the safety label and safety data sheet.

There are 7 things that must be paid attention to when using hazardous chemicals:

1) Before the use of hazardous chemicals, it is necessary to read the "Safety Data Sheet" of the hazardous chemicals in advance. (2) The operator shall wear the corresponding labor protection fuel products in accordance with the requirements of the "Safety Technical Manual" of the hazardous chemicals. (3) When loading and unloading hazardous chemicals, they should be handled gently to prevent violent vibrations such as impact and friction.

4) When shipping and unloading hazardous chemicals, there should be no tilting, **, inversion, stacking too high, etc. (5) When using the hazardous chemicals of Class A fire protection grade, do not wear shoes with iron nails, and carry mobile phones or metal keys. (6) After the work is completed, wash your hands, face or shower in time, and wash or eliminate the labor protection equipment.

7) At the use site, a certain amount of first-aid equipment, medicines and materials must be available.