Liquid alkali refers to sodium hydroxide in liquid form, also known as caustic soda or caustic soda. There are two types of liquid caustic soda: solid and liquid. Pure solid caustic soda is white in color and can be in the form of blocks, flakes, rods, or granules, with a brittle texture; Pure liquid caustic soda is a colorless and transparent liquid.

Due to different production processes, industrial products in existing chlor alkali plants often contain impurities, mainly sodium chloride and sodium carbonate, and sometimes a small amount of iron oxide. After dissolving into concentrated alkali, most impurities will float to the liquid surface and can be separated and removed. Solid caustic soda has strong hygroscopicity and is easily soluble in water. When dissolved, it releases heat, resulting in a strongly alkaline solution with a smooth and bitter texture. It can turn red atmospheric litmus paper blue and phenolphthalein solution red. It is also soluble in ethanol and glycerol, but insoluble in acetone, ether, and acetic acid. When encountering acid, it neutralizes and forms salt and water. Capable of saponification of fats and oils, producing soap and glycerol. Easily absorbs carbon dioxide and moisture from the air to form carbonates.

Main purpose

Liquid alkali is an important chemical raw material with a wide range of applications. The chemical industry is used to manufacture formic acid, oxalic acid, borax, phenol, sodium cyanide, soap, synthetic fatty acids, synthetic detergents, etc. The textile printing and dyeing industry uses it as a solvent for cotton fabric desizing agent, scouring agent, silk gloss agent, reducing dye, and navy blue dye. Manufacturing aluminum hydroxide, aluminum oxide, and metal surface treatment agents for the smelting industry. The instrument industry uses it as an acid neutralizer, decolorizer, and deodorizer. The adhesive industry uses it as a starch gelatinizer and neutralizer. In addition, it is widely used in industries such as enamel, medicine, cosmetics, leather making, coatings, pesticides, and glass.

1、 Refined petroleum

After being washed with sulfuric acid, petroleum products still contain some acidic substances that must be washed with sodium hydroxide solution and then washed with water to obtain refined products.

2、 Printing and dyeing

3、 Textile fibers

4、 Paper making

5、 Improving acidic soil with lime

6、 Chemical industry and chemical reagents

1. Pharmaceutical

Stomach medicine: The ingredients include aluminum hydroxide, magnesium hydroxide, sodium bicarbonate, and a small amount of sodium hydroxide. Its main function is to neutralize stomach acid.

Carboxymethyl cellulose sodium (CMC): emulsification, bonding, and film formation for food and pharmaceuticals. Used as an anti fouling and anti redeposition agent in detergents. Alkali cellulose is produced by reacting refined cotton with NaOH, and then etherified with chloroacetic acid in a one-step process.

2. Green water purification agent

Preparation of sodium ferrate (Na2FeO4)

3NaClO (sodium hypochlorite)+2Fe (OH) 3 (iron hydroxide)+4NaOH=2Na2FeO4+3NaCl+5H2O

Alkaline aluminum chloride (PAC/BAC) denatures viral proteins And water purification, wastewater treatment, strong sodium oxide to adjust pH value

3. Ion exchange resin

After the failure of anion exchange resin, it is generally regenerated with 5% -8% NaOH solution

4. Alkaline cleaning agent

NaOH solution can be used for the preparation of various cleaning agents, such as car wash, bottle wash, detergent, rust remover, disinfectant, mainly used for cleaning bottles in the liquor industry, surface treatment of ceramic and metal industries, etc

5. Sodium hypochlorite bleach

7、 Rubber, leather

1. Precipitated white carbon black

2. Recycling of old rubber

In the recycling of old rubber, sodium hydroxide solution is used for pre-treatment of rubber powder, followed by subsequent processing.

3. Leather

8、 Metallurgy, Electroplating

9、 Other functions

1. There are two functions of ceramic caustic soda in ceramic manufacturing. Firstly, caustic soda acts as a diluent during the firing process of ceramics Secondly, the surface of the fired ceramic may have scratches or be very rough. After cleaning with caustic soda solution, the ceramic surface will become smoother

2. The instrument industry uses it as an acid neutralizer, decolorizer, and deodorizer.

precautions

Liquid alkali belongs to Class I inorganic alkaline corrosive substances, with hazard code 82001. Liquid alkali is transported by tank trucks or storage tanks; Industrial solid alkali is packaged in iron drums or other sealed containers, with the "corrosive substance" mark on the packaging. Store in a well ventilated and dry place. Water, yellow sand, and various fire extinguishers can be used to extinguish a fire.

Caustic soda is highly corrosive. When it comes into contact with the skin, it should be immediately rinsed with clean water. If it splashes into the eyes, it should be rinsed with clean water or saline solution for 15 minutes. In severe cases, it should be taken to the hospital for treatment.

Engineering control involves closed operations. Provide safety shower and eye wash equipment.

When personal protection may come into contact with dust, it is necessary to wear a hood type electric air supply filter dust respirator. If necessary, wear an air respirator. Wear rubber acid resistant clothing. Wear rubber acid and alkali resistant gloves.

Smoking, eating, and drinking are prohibited at other work sites, and hands must be washed before meals. After work, take a shower and change clothes. Pay attention to personal hygiene and cleanliness.