1.2 Technology Introduction

1. Sodium chlorate solution, concentrated sulfuric acid, and hydrogen peroxide from the storage tank are added to the reactor in a specific ratio. Under low negative pressure conditions, a multi-stage reaction is carried out to generate chlorine dioxide gas.

2. The generated chlorine dioxide gas is diluted with air and enters the absorption tower from the top of the reactor. It is absorbed by a specific ratio of sodium hydroxide and hydrogen peroxide solution to form a sodium chlorite solution of a certain concentration.

3. The generated sodium chlorite solution is evaporated, concentrated, crystallized, filtered, and dried to become solid sodium chlorite.

Reaction Equation: Sodium chlorite production involves two steps:

a. Production of chlorine dioxide: Sodium chlorate is reduced to ClO2 by hydrogen peroxide under acidic conditions.

2NaClO3 + H2SO4 + H2O2 = 2ClO2 + Na2SO4 + 2H2O + O2

b. Preparation of sodium chlorite: Under alkaline conditions, ClO2 is reduced to sodium chlorite by hydrogen peroxide.

2NaOH + 2ClO₂ + H₂O₂ = 2NaClO₂ + 2H₂O + O₂ 

Technical Features and Advantages:

1) High output (15 tons/day for solid products; 50 tons/day for liquid products);

2) High technological maturity, high raw material utilization rate, reaction byproducts are mainly water and oxygen, green and low-carbon, safe, stable and continuous operation;

3) High degree of automation, convenient operation and maintenance;

1.3 Application Areas: 

Sodium chlorite (NaClO₂) is a highly efficient and stable bleaching agent, oxidant and disinfectant, used in small and medium-scale production scenarios with high product quality and environmental protection requirements, such as pulp and paper bleaching and drinking water disinfection.

1.4 Project Services:

1.Technical Services: Technical services for the sodium chlorite preparation project include project process design, system installation and commissioning guidance, theoretical and on-site operation training, etc. 

2. Pre-sales service: Optimize process design based on customer needs to ensure the solution meets their requirements.

3. In-sales service: Provide accurate civil engineering information, optimize process design and equipment/instrument selection, create detailed construction drawings, track equipment processing and overall project progress throughout the entire process, and coordinate resources from all parties to ensure smooth project implementation.

4. After-sales service: Respond promptly to customer feedback, and visit the site as needed to resolve issues, ensuring the long-term stable operation of the entire chlorine dioxide preparation unit.