Sodium Chlorite NaClO2 CAS 7758-19-2 for paper

The basic parameters of sodium chlorite:

CAS: 7758-19-2

Chemical name: Sodium Chlorite 25%

Chemical formula: NaClO2

Molecular weight: 90.44

Appearance: white or light yellow crystalline powder or small particles

Density: 2.1 g/cm³

Melting point: 180-200°C

Boiling point: Dissociation

Water solubility: soluble in water, easily soluble in hot water and alcohol, slightly soluble in ether and ethyl acetate

Stability: Stable, but can react violently when in contact with strong acids, strong oxidants and combustibles, releasing chlorine gas

Main application: bleaching agent, disinfectant, water treatment agent, metal surface treatment agent, etc.

In the paper industry, sodium chlorite is mainly used as a bleaching agent, which can effectively remove impurities and pigments in cellulose raw materials, and improve the whiteness and transparency of paper. At the same time, sodium chlorite can also be used as a disinfectant and preservative to maintain the hygiene and stability of the paper. If you want to purchase a solution, we can customize a specific ratio of sodium chlorite solution for you according to your requirements.

Sodium chlorite solution 26%

Sodium chlorite bleach for paper

Sodium chlorite is widely used as a bleaching agent in papermaking. Its main function is to bleach wood pulp and other cellulose raw materials to achieve high whiteness and good printability and writeability of paper.

The use of sodium chlorite in the papermaking process is usually divided into two stages:

• Pre-bleaching: Sodium chlorite reacts with acidic medium (such as hydrochloric acid, sulfuric acid, etc.) to generate chlorous acid gas, which further reacts with water to generate hypochlorous acid (ClO-), and then hypochlorous acid reacts with wood pulp or other The pigment reaction in the cellulose raw material causes bleaching.

• Post-bleaching: Post-bleaching generally uses bleaching agents such as hydrogen peroxide or chlorine dioxide to further improve the bleaching effect and gloss.

Sodium chlorite bleach has the following advantages over other bleaching agents:

• Good bleaching effect: The bleaching effect of sodium chlorite is obvious, which can improve the whiteness and purity of paper.

• Small impact on the environment: The by-products of sodium chlorite bleaching are relatively small, and the pollution and damage to the environment are relatively small.

It is important to note that sodium chlorite is a hazardous chemical that needs to be stored and used properly.

Sodium chlorite solution 31%

Sodium chlorite usage and dosage

The usage and amount of sodium chlorite used in papermaking will vary according to the specific paper variety, production process and equipment conditions, and generally need to be adjusted according to the actual situation. The following is the general usage and dosage reference of sodium chlorite in papermaking:

Sodium chlorite usage:

• Pre-bleaching method: Add sodium chlorite solution to an acidic medium (such as hydrochloric acid or sulfuric acid) to make a mixed solution, and then add the mixed solution to the paper cellulose raw material for pre-bleaching.

• Post-bleaching method: Add sodium chlorite solution to the paper cellulose raw material, and then add an appropriate amount of alkaline agent (such as sodium hydroxide) for post-bleaching.

Sodium chlorite dosage:

• Pre-bleaching method: The dosage of sodium chlorite is generally 0.5%-1.5% of the dry weight of paper cellulose raw materials, and the dosage of acidic medium is generally 2-4 times of the dosage of sodium chlorite.

• Post-bleaching method: The dosage of sodium chlorite is generally 0.1%-0.3% of the dry weight of the paper cellulose raw material, and the dosage of alkaline agent is generally 1.5-2 times the dosage of sodium chlorite.

It should be noted that too much sodium chlorite will affect the strength and stability of paper, and will also cause pollution to the environment. Therefore, when using sodium chlorite for bleaching, the appropriate dosage should be selected according to the specific situation, and at the same time, the treatment of waste water and waste gas should be strengthened to reduce environmental pollution. The bleaching ability of Sodium chlorite NaClO2 is 4~5 times that of bleaching powder. Sodium chlorite NaClO2 is widely used in paper industry. The specific amount of addition has a lot to do with your pH value, concentration, process, etc., so you need to do some corresponding experiments according to the requirements of the paper you want to produce, and get the best after repeated experiments. usage, this is the best.

How to store and transport sodium chlorite for papermaking?

When storing and transporting sodium chlorite for papermaking, the following points need to be paid attention to:

Storage environment

Sodium chlorite should be stored in a cool, dry and well-ventilated environment, avoiding direct sunlight, humidity and high temperature. At the same time, contact with acids, oxidants, flammables and other substances should be avoided to prevent chemical reactions.

Packaging container

Sodium chlorite should be stored in well-sealed plastic barrels or polyethylene bags to prevent moisture and air from entering.

Shipping requirements

Sodium chlorite is a hazardous chemical, and it needs to be packaged, marked and transported in accordance with relevant laws, regulations and transport standards to ensure transport safety. At the same time, it should avoid mixing and transporting with flammable, volatile and oxidizing substances to prevent accidents.

Pay attention to protection

Sodium chlorite is a strong oxidant, which is irritating and corrosive. Protective glasses, gloves, masks and other protective equipment should be worn to avoid direct contact. In case of accidental contact with skin or eyes, rinse immediately with plenty of water and seek medical attention.

Finally, the storage and transportation of sodium chlorite for papermaking requires attention to safety and environmental protection, compliance with relevant laws, regulations and standards, and ensuring the quality and safety of sodium chlorite.

As a professional supplier of sodium chlorite, whether you are a distributor or an end user of chlorite, we will give you corresponding suggestions and advantageous prices. If you are planning to purchase sodium chlorite, please contact us as soon as possible.

FAQ

Q: What is sodium chlorite (NaClO2)?

A: Sodium Chlorite (NaClO2) is a chemical compound composed of sodium (Na+) and chlorite (ClO2-) ions. It is a white, crystalline powder or a yellow-green liquid with strong oxidizing properties.

Q: What is the CAS number for sodium chlorite?

A: The CAS number for sodium chlorite is 7758-19-2.

Q: How is sodium chlorite used in the paper industry?

A: Sodium chlorite is commonly used in the paper industry as a bleaching agent. It helps remove lignin and other impurities from wood pulp during the bleaching process, resulting in bright and high-quality paper products.

Q: What are the benefits of using sodium chlorite in paper bleaching?

A: Sodium chlorite is an effective and efficient bleaching agent that can achieve significant brightness improvement in paper products. It offers better selectivity and lower environmental impact compared to traditional chlorine-based bleaching agents.

Q: Is sodium chlorite safe to use in paper bleaching?

A: When used properly and following recommended guidelines, sodium chlorite is considered safe for paper bleaching. However, it is essential to handle and store the chemical with care and adhere to safety precautions.

Q: How is sodium chlorite applied in the paper bleaching process?

A: In the paper bleaching process, sodium chlorite is typically added to the pulp slurry. The bleaching conditions, including dosage, temperature, and pH, are carefully controlled to achieve the desired brightness and quality.

Q: Does the concentration of sodium chlorite used in paper bleaching vary?

A: Yes, the concentration of sodium chlorite used in paper bleaching can vary depending on the specific process and paper grade requirements. It is available in various concentrations, typically ranging from 25% to 80%, which can be diluted to the desired level.

Q: Are there any environmental considerations when using sodium chlorite in paper bleaching?

A: The use of sodium chlorite in paper bleaching has environmental advantages over traditional chlorine-based bleaching agents. It produces fewer harmful byproducts, reducing the environmental impact.

Q: Is sodium chlorite regulated in the paper industry?

A: Yes, the use of sodium chlorite in the paper industry is subject to regulations and guidelines related to its safe handling, storage, and disposal. Compliance with relevant safety and environmental standards is essential.

Q: Can sodium chlorite be used in combination with other chemicals in paper bleaching?

A: Yes, sodium chlorite can be used in combination with other chemicals, depending on the specific bleaching process. Care should be taken to ensure compatibility and avoid unintended reactions.

Q: Can sodium chlorite be used for other purposes in the paper industry?

A: Sodium Chlorite may have limited applications in other paper-related processes, such as deinking or pre-bleaching, depending on the paper production requirements and process conditions. However, its primary use remains as a bleaching agent.