Carbonyl Hydrazine Usage Tutorial

Carbohydrazide is a strong reducing chemical, primarily used as a boiler water deoxygenator, metal passivating agent, and chemical intermediate. Due to its toxicity and the potential for explosive reactions with acids or nitrous acid, it must be handled under strict safety regulations and under professional guidance.

Core Application Scenarios and Operating Methods

1. Boiler Water Deoxygenation

Addition Method: Powdered carbohydrazide can be directly added to water, or a pre-prepared aqueous solution can be continuously injected into the system via a dosing pump.

Reaction Conditions: The applicable temperature range is 87.8–176.7℃. It is typically added after the thermal deoxygenation process to remove residual dissolved oxygen.

Dosage Calculation: The theoretical stoichiometric ratio is 0.5 mol of carbohydrazide for every 1 mol of oxygen. In practical applications, a slight overdose is recommended to ensure thorough deoxygenation.

Combined Use: It can be used alone or in combination with redox catalysts to improve the reaction rate at low temperatures.

Reaction Products: Reacts with oxygen to produce nitrogen, carbon dioxide, and water, leaving no solid residue and not increasing boiler salinity.

2. Other Industrial Applications

Metal Passivation: Used to reduce metal corrosion rates; requires specific pH and temperature conditions to form a protective film.

Chemical Synthesis: Used as an intermediate in pharmaceuticals, dyes, and herbicides; requires precise synthetic operations such as diazotization or hydrogenation reduction in a closed reactor; strictly prohibited in non-professional laboratory environments.

Rubber and Textiles: Used as an antioxidant for rubber or a crosslinking agent for synthetic elastic fibers; uniformly dispersed in raw materials according to the formulation ratio.

Key Safety and Handling Precautions

Personal Protective Equipment: Chemical-resistant gloves, goggles, and dust masks must be worn during operation to avoid dust inhalation or direct skin contact, as these can cause skin irritation and allergies.

Strictly Prohibited from Mixing with Acidic Substances: Absolutely prohibited from mixing with acidic substances. In the presence of nitrous acid, it will transform into highly explosive carbonyl azide compounds, posing an extremely high explosion risk.

Storage Requirements: Must be stored in a sealed container in a cool, dry, and well-ventilated place, away from strong oxidizers and heat sources to prevent thermal decomposition and the generation of toxic gases.

Environmental Protection: This substance is toxic to aquatic life. Waste liquid must undergo professional treatment to meet standards before discharge and must not be directly discharged into water bodies.