How to use caustic soda

Question 1: How to Use Caustic Soda Regulations on the Safety Management of Hazardous Chemicals (released in the State Council on February 1987), Detailed Rules for the Implementation of Regulations on the Safety Management of Hazardous Chemicals (Hua Lao Fa [1 992] No.677) and Regulations on the Safe Use of Chemicals in the Workplace ([1 996] This substance is classified as Class 8.2 alkaline corrosive products in Classification and Labeling of Commonly Used Hazardous Chemicals (GB 13690-990 "Technical Specification for Safety in Caustic Soda Production by Diaphragm Method" (HGA00 1-83) and "Technical Specification for Safety in Caustic Soda Production by Mercury Method" (HGA002-83) Protective equipment should be worn when exposed to caustic soda in large quantities, and work clothes or working caps should be made of cotton cloth or appropriate synthetic materials. Operators must wear work clothes, masks, protective glasses, rubber gloves, rubber aprons, rubber boots and other labor protection articles when working. Neutral and hydrophobic ointments are applied to the skin. When contacting flake or granular caustic soda, the workplace should be ventilated. The maximum allowable concentration in indoor air in China is 0.5mg/m3, and that in ACGIH TLVC in the United States is 2mg/m3. It is necessary to wear a hood-type electric air supply and dust filtering respirator when it may come into contact with its dust. Wear air respirator if necessary. Operators must be specially trained and strictly abide by the operating procedures. It is recommended that the operator wear a hood-type electric air supply filter dust mask, rubber acid and alkali resistant clothing and rubber acid alkali resistant gloves. Keep away from flammable and combustible materials. Avoid dust. Avoid contact with acids. When handling, handle with care to prevent the packaging and container from being damaged. Equipped with leakage emergency treatment equipment. Empty containers may leave harmful substances behind. If you want to keep sodium hydroxide solid, you need to put it in a sealed container with desiccant. When diluting or preparing the solution, alkali should be added to the water to avoid boiling and splashing. Wear protective glasses and gloves when dealing with the leakage, sweep it up, slowly pour it into a large amount of water, rinse the ground with water, and put the diluted sewage into the wastewater system. When lye contacts the skin, it can be cleaned with 5 ~ 10% magnesium sulfate solution; If it spills into eyes, it should be cleaned immediately with a large amount of boric acid aqueous solution; When a small amount is eaten by mistake, it should be neutralized with vinegar, 3 ~ 5% acetic acid or 5% dilute hydrochloric acid, and a large amount of orange juice or lemon juice. , and give egg white, milk or vegetable oil, and seek medical advice quickly. Vomiting or gastric lavage is not allowed. Sodium hydroxide crystal solid sodium hydroxide can be packed in steel drums with a thickness of 0.5 mm and sealed tightly, and the net weight of each drum does not exceed 100 kg. Steel drums with full opening or middle opening outside plastic bags or double-layer kraft paper bags; Threaded glass bottles, iron-capped glass bottles, plastic bottles or ordinary wooden cases outside metal barrels (cans); A threaded glass bottle, plastic bottle or tinned steel barrel (can) is sheathed with a bottom plate lattice box, a fiberboard box or a plywood box; Tinned steel drums (cans), metal drums (cans), plastic bottles or corrugated boxes with metal hoses. Packaging containers should be complete and sealed, and should have obvious signs of "corrosive substances". In railway transportation, steel drums can be transported by open cars. The package shall be intact during shipment and the loading shall be safe. During transportation, it is necessary to ensure that the container does not leak, collapse, fall or be damaged, and is moisture-proof and rain-proof. If rust, cracking, perforation, melting and dripping are found in the packaging container, the packaging should be replaced immediately or shipped as soon as possible. Damaged containers can be repaired by welding. It is strictly prohibited to transport with flammable or combustible materials, acids and edible chemicals. Transport vehicles should be equipped with leakage emergency treatment equipment during transportation. Do not mix with flammable materials and acids. In case of fire, water, sand and various fire extinguishers can be used to put out the fire, but firefighters should pay attention to the corrosiveness of caustic soda dissolved in water.

Question 2: How to use caustic soda How to use caustic soda: Dilute or dissolve caustic soda with water to make 2% caustic soda solution, which can disinfect the environment and utensils to prevent viral infectious diseases such as Newcastle disease and gosling plague, as well as bacterial diseases such as Salmonella and Escherichia coli.

Question 3: How to use caustic soda sodium hydroxide, with the chemical formula of NaOH, commonly known as caustic soda, caustic soda and caustic soda, is a strongly corrosive alkali, which is generally flaky or granular, easily soluble in water (exothermic when dissolved in water) and forms an alkaline solution, and has deliquescence, and easily absorbs water vapor (deliquescence) and carbon dioxide (deterioration) in the air. Hydrochloric acid can be added to check for deterioration.

NaOH is one of the essential chemicals in the chemical laboratory, and it is also one of the common chemicals. Pure products are colorless and transparent crystals. The density is 2.130g/cm3. The melting point is 3 18.4℃. The boiling point is 1390℃. Industrial products contain a little sodium chloride and sodium carbonate, which are white opaque crystals. There are blocks, sheets, granules and rods. Equation 40.0 1

Sodium hydroxide can be used as an alkaline cleaning agent in water treatment, soluble in ethanol and glycerol; Insoluble in propanol and ether. It will also corrode sodium carbonate at high temperature. Disproportionation of chlorine, bromine, iodine and other halogens. Neutralization with acid produces salt and water.

Question 4: How to use caustic soda 100 kg of water accounts for 98% of the solution.

Therefore, the total weight of the solution is 100\98% kg.

Sodium hydroxide accounts for 2%

Need (100 \ 98%)* 2%

Sodium hydroxide is a drug with good disinfection effect. Its 2%~4% solution can kill reproductive bacteria and viruses, 10% solution can kill mycobacterium tuberculosis within 24 hours, and 30% solution can kill anthrax spores within 10 minutes. Therefore, caustic soda is often used to disinfect infectious diseases such as pullorum, fowl plague, duck plague, fowl cholera, swine fever, bovine influenza, tuberculosis, brucellosis and foot-and-mouth disease. Generally, 2%~4% solution is used to disinfect the floors, barns, wooden utensils and vehicles transporting livestock and poultry in farms and slaughterhouses. Its solution can be used after heating, which can improve the disinfection effect; Adding 10% salt can enhance the efficacy of killing spores. Attention should be paid when using caustic soda for disinfection: caustic soda will burn skin and organs, so it is not suitable for livestock disinfection, and livestock should be driven out of the house when disinfection is carried out; Personnel engaged in disinfection operations should pay attention to self-protection to avoid burning the skin. Sodium hydroxide is corrosive to textiles and aluminum products, and such products cannot be disinfected with this medicine. Vehicles and ships transporting livestock and poultry are disinfected with caustic soda solution for 6~ 12 hours, and then the disinfectant is thoroughly washed off with clean water to avoid corrosion and damage.

Question 5: How to use caustic soda to remove oil stains Because of my work, I often come into contact with caustic soda. You need to use a low concentration. I think it was 35%. It's dry powder, just like a meeting. This concentration of caustic soda is corrosive to the skin, but it is not as terrible as you think. In fact, it just makes your hands rough, nothing else. If you are washing work clothes, you can directly sprinkle small stains on the clothes, which will have a good effect. If there are a lot of places to wash, it's not very suitable. Just wear plastic gloves when washing. It's very cheap, and there's nothing else to pay attention to. If it is a stove, you should use a delicate and soft wire brush when washing dishes, but you should pay attention to your eyes, which is easy to splash. If it gets into your eyes, it's even more troublesome. You should rinse with clean water 15 minutes, and then send it to the hospital. This will not cause blindness, but it will do great harm to your eyes. There is also the need to pay attention to a certain proportion. Don't want a pot of water, just add a gourd ladle of caustic soda, which has no effect at all. The purpose of adding water is the same as that of washing powder. You don't need to use washing powder to wash clothes without adding water. When caustic soda meets water, it easily turns into a ball, so when we wash things in the west, we usually put a basin of water next to it. After wetting the cleaning tools, we will attack directly with caustic soda. I hope it helps you.

Question 6: How to use caustic soda to clean oil stains? Because of my work, I often contact caustic soda. You need to use a low concentration. I think it was 35%. It's dry powder, just like a meeting. This concentration of caustic soda is corrosive to the skin, but it is not as terrible as you think. In fact, it just makes your hands rough, nothing else. If you are washing work clothes, you can directly sprinkle small stains on the clothes, which will have a good effect. If there are a lot of places to wash, it's not very suitable. Just wear plastic gloves when washing. It's very cheap, and there's nothing else to pay attention to. If it is a stove, you should use a delicate and soft wire brush when washing dishes, but you should pay attention to your eyes, which is easy to splash. If it gets into your eyes, it's even more troublesome. You should rinse with clean water 15 minutes, and then send it to the hospital. This will not cause blindness, but it will do great harm to your eyes. There is also the need to pay attention to a certain proportion. Don't want a pot of water, just add a gourd ladle of caustic soda, which has no effect at all. The purpose of adding water is the same as that of washing powder. You don't need to use washing powder to wash clothes without adding water. When caustic soda meets water, it easily turns into a ball, so we usually put a basin of water next to it when washing things in the west, put a basin of caustic soda, wet the cleaning tools, and then attack it directly with caustic soda. I hope it helps you.

Question 7: How to use caustic soda to make paper? In papermaking, caustic soda is mainly used in the cooking part of papermaking. Generally, steamed meatballs are made of caustic soda, which is cooked at high temperature after a certain liquid ratio to dissolve lignin in raw materials. There are many options for cooking and washing methods mainly using grass fiber. The most economical and reasonable washing method should be selected according to the requirements of production capacity and pulp purity. Generally there are; Static pressure washing, high concentration extrusion, rinsing, etc.

Question 8: What are the uses of caustic soda? Sodium hydroxide is widely used in various production processes and is a widely used chemical raw material. In chemical production, sodium hydroxide provides an alkaline environment or acts as a catalyst, and the dilute solution of sodium hydroxide can be used as washing liquid at home. It is used to make pulp, soap, synthetic detergent, viscose fiber, printing and dyeing, etc. In textile industry, it is also used to manufacture aluminum in metallurgical industry, process various petroleum products in petroleum industry and process various organic intermediate products in chemical industry. The following are the applications in various industries: 1, printing and dyeing, textile industry, and a large amount of lye is used to remove grease from cotton yarn and wool. Caustic soda or soda ash is also needed to produce man-made fibers. 2. In metallurgical industry, it is often necessary to convert the effective components in ores into soluble sodium salts to remove insoluble impurities. Therefore, it is often necessary to add soda ash (which is also a flux), and sometimes caustic soda is used. Soda should also be used in refined oil. In order to remove gum from petroleum fraction, concentrated sulfuric acid is usually added to petroleum fraction to make gum become acid residue and precipitate. The acid-washed petroleum still contains acidic impurities such as phenol, naphthenic acid and redundant sulfuric acid. It must be washed with caustic soda solution and then washed with water to obtain refined petroleum products. In chemical industry, caustic soda is used to make metallic sodium and electrolytic water. Synthetic dyes, drugs and organic intermediates require caustic soda or soda ash. Soda or soda ash is used to produce many inorganic salts, especially some sodium salts. 5. In the paper industry, chemical treatment should be used first, and raw materials containing cellulose (such as wood) should be cooked with chemical reagents to make pulp. In a word, caustic soda is widely used in all walks of life and is a very important chemical raw material. Our company is an excellent enterprise focusing on flake caustic soda, with strong strength and sufficient supply, which can meet the requirements of friends from all walks of life. Flake caustic soda is a kind of caustic soda. Flake caustic soda is widely used in soap making, textile, printing and dyeing, bleaching, paper making, oil refining, metallurgy and other chemical industries. In the printing and dyeing and textile industries, a large amount of lye should also be used to remove the grease from cotton yarn and wool. The production of man-made fibers also requires flake caustic soda or soda ash. Refined petroleum also needs flake alkali. In order to remove gum from petroleum fraction, concentrated sulfuric acid is usually added to petroleum fraction to make gum become acid residue and precipitate. The acid-washed petroleum still contains acidic impurities such as phenol, naphthenic acid and redundant sulfuric acid. It must be washed with caustic soda solution and then washed with water to obtain refined petroleum products. In chemical industry, caustic soda is used to make metallic sodium and electrolyzed water. The production of many inorganic salts, especially some sodium salts (such as borax, sodium silicate, sodium phosphate, sodium dichromate, sodium sulfite, etc.). ) flake alkali or soda ash is needed. In metallurgical industry, it is often necessary to convert the effective components in ore into soluble sodium salts to remove insoluble impurities. Therefore, it is often necessary to add soda ash (which is also a flux), and sometimes caustic soda is used. In the paper industry, the raw materials containing cellulose and chemical reagents should first be treated by chemical methods to make pulp. Synthetic dyes, drugs and organic intermediates also need flaky bases.

Question 9: How to dredge the sewer with caustic soda, and how much does it need? First, waterway dredging agent: it is the best product on the market at present. This product is especially effective for removing the blockage caused by hair, greasy and paper. Widely used in restaurants, hotels, families and other vegetable sinks, wash basins, bathtubs, floor drains, toilets and other blockages. Do not damage the sewer pipe (including PVC pipe) and electroplating layer.

Usage: Clear the accumulated water in the washbasin or sanitary ware, and pour 50-100g of this product into the sewer. If there is no water in the sewer, please add half a cup of clear water. At this time, the pipe is boiling. After about 20 minutes, rinse with plenty of water.

Recommended dosage: washbasin, bathtub, floor drain-100g, vegetable sink-200g, toilet-400g.

Second, the method of cleaning up the blockage of the bathtub sewer pipe: (mainly due to the hair left in the shower). Because there is a cover at the drain of the bathtub, it can only be cleaned from the floor drain. Go to a small shop and buy a 8 yuan (about 6 mm in diameter) hand-cranked spiral steel wire, push it down from the floor drain until you feel something foreign with your hands, and then gently pull it out while shaking it. Clogged hair and other dirt will spin on the spiral steel wire, and the problem will be solved. (Never use hydrochloric acid. First of all, it pollutes the environment. Secondly, it is very dangerous to human body. Thirdly, if the pipeline is used for too long, it is easy to be corroded by hydrochloric acid, and the trouble is even greater. )

Third, put caustic soda into the sewer, and then pour a pot of boiling water into it, not a thermos cup, but a large pot of boiling water.

4. If you once watered the children with iron pot water and asked the workers to pass through with iron branches, but later you stopped watering, it is not suitable to use iron branches again, because you are worried that the corroded canals will be penetrated. It can be replaced by thick rattan. Ten eight-inch nails can be nailed to the rattan head, and the impurities are loosened while being put in, then the concentrated alkali solution is poured in, and then the rattan is pushed out. If this continues many times, it will have an effect. In addition to thick vines, you can also buy spring channel openers from hardware stores, which is more effective. Salt, white vinegar, straws, etc. Being used by ordinary people can't work.

5. Get some baking soda and vinegar.

Six, other small coup:

1, animal fat blockage: If it is oily, it is recommended to flush it with boiling water. Of course, it would be better if you could buy concentrated sulfuric acid. If something blocks it, you can only use that special tool to clean the pipeline.

2, cement plug: 70% hydrochloric acid can not be found, 35% are sold everywhere, you can try. Adding a little flour as preservative, urotropine is the best. The corrosion of steel can be reduced.

3. Buy a 2-meter-long spring steel pipe dredging tool in the market, bend its head at 10-20 degrees 1-2 cm, dredge it back and forth at the sewer inlet and outlet, and rinse it with water.

Seven, go to the mall to buy professional cleaning pipe powder, such as (swallowing king, etc.

8. If your sewer is made of new PVC, you can suck up the water on it with a vacuum pump first, and then fill it with concentrated vinegar or caustic soda, industrial vinegar and industrial alkali, but don't mix them, just use one. If you don't know or are not sure, or it must be an old-fashioned iron pipe, you can only try vinegar-grade weak acid at most. Never use the above method. It will take about 3 hours after filling out these things.

Nine, put the small Huang Huai, or add some detergent or salt and other things, and then cover it, and the sewer pipe will be connected in an instant!

10. Green method of dredging sewer: pour 1 cup of washing powder into the blocked sewer, and then pour 3 cups of hot water. If this doesn't clear the sewer, pour 1 cup of vinegar into it.

Question 10: Use of caustic soda 1. In production and use places, operators must wear protective glasses, rubber gloves and rubber boots to prevent alkali liquid or solid caustic soda fragments from contacting eyes and skin and causing burns.

2. In view of the characteristics of the heat of dissolution of caustic soda, alkali should be added to the water when diluting or preparing flake alkali; During operation, the operator must slowly add alkali to the container to prevent a sudden exothermic reaction from causing a combustion accident.

3. The stored flake caustic soda should be used first come first served, and the storage time should be shortened as much as possible to avoid moisture absorption and caking.

4. If the caked flake caustic soda is stored for a long time, the main content of caustic soda will not change under the condition that the packaging bag is intact, and the use effect will not be affected after crushing.