1,3-Diethyl-1,3-diphenylurea (CentraliteⅠ) CAS 85-98-3

Introduction to 1,3-Diethyl-1,3-diphenylurea

1,3-Diethyl-1,3-diphenylurea, widely known as Centralite Ⅰ, is a symmetric disubstituted urea compound with ethyl and phenyl groups bound to each nitrogen atom. It appears as white to off-white crystalline powder at room temperature. It dissolves readily in alcohol, ether and most aromatic solvents, and shows very low solubility in water.

Industrial production follows reaction of diphenylamine with ethyl isocyanate, or phosgene-based carbonylation under controlled conditions. The compound acts as a radical scavenger that captures nitrogen oxide species released during nitrocellulose degradation. This mechanism slows autocatalytic breakdown of double-base propellants and preserves ballistic properties over long storage cycles.

1,3-Diethyl-1,3-diphenylurea Chemical & Physical Properties

Applications of 1,3-Diethyl-1,3-diphenylurea

Propellant and powder stabilizer: Added to single-base and double-base smokeless powders to neutralize nitrous oxides formed during aging. It extends safe storage life and prevents degradation of ballistic performance parameters.

Defense and aerospace propellants: Incorporated into composite rocket propellant formulations as a chemical stabilizer. It works alongside other stabilizers to maintain propellant integrity under temperature cycling and long-term storage.

Organic synthesis intermediate: Used as a building block for specialty urea derivatives and pharmaceutical intermediate production. It also serves as a corrosion inhibitor additive in certain industrial fluid systems.

Rubber and polymer processing: Acts as a vulcanization activator and stabilizer in specialty rubber compounds, improving heat aging resistance of finished rubber articles.

Storage & Safety Precautions

• Store in tightly sealed fiber drums or steel containers in a cool, dry and ventilated warehouse. Keep away from strong acids, oxidizing agents and direct sunlight. Protect from moisture to prevent caking.
• Wear safety goggles, dust masks and nitrile gloves during powder handling. Avoid inhalation of dust and prolonged skin contact. The material may cause mild irritation to eyes and respiratory tract.
• Handle material in dust-controlled areas to prevent airborne accumulation. Use grounded conductive equipment during bulk transfer. Keep bulk storage areas equipped with appropriate dust collection systems.

1,3-Diethyl-1,3-diphenylurea FAQ

Q: What is the main function of Centralite Ⅰ in propellants?

A: It acts as a stabilizer that traps nitrogen oxide decomposition products. This slows nitrocellulose degradation and extends the safe storage life of smokeless powders and propellants.

Q: Does Centralite Ⅰ dissolve in water?

A: 1,3-Diethyl-1,3-diphenylurea shows very low water solubility. It dissolves well in alcohols, ethers and most aromatic organic solvents used in propellant processing.

Q: What purity grade is standard for propellant-grade Centralite Ⅰ?

A: Standard industrial grade reaches 99.0% min purity by HPLC with a defined melting range. It meets typical requirements for propellant and specialty chemical formulation.