Octadecyltrimethylammonium bromide, commonly abbreviated as 1831 ammonium bromide, is an organic compound belonging to the class of quaternary ammonium salt cationic surfactants. Its chemical formula is C18H39N(CH3)3Br, and it is a widely used surfactant with applications in various fields.

Basic Properties:

• Appearance: Typically appears as a white or pale yellow solid or granules.

• Molecular Weight: Approximately 348.50

• Melting Point: Approximately 227-232°C

• Solubility: Easily soluble in water, with aqueous solutions being alkaline.

• Stability: Stable under normal conditions but should be kept away from oxidizing agents.

Applications:

1. Disinfectant and Bactericide: Due to its cationic nature, octadecyltrimethylammonium bromide can disrupt bacterial cell membranes, making it commonly used as a disinfectant and bactericide.

2. Emulsifier: Serves as an emulsifier in cosmetics and personal care products, helping to mix oil-based ingredients with water.

3. Flocculant: Used as a flocculant in wastewater treatment to aid in the removal of suspended solids.

4. Softener and Antistatic Agent: In textile processing, it is used to enhance fabric softness and reduce static electricity.

5. Phase Transfer Catalyst: Acts as a phase transfer catalyst in organic synthesis to improve reaction efficiency.

6. Flotation Agent: Employed in the mining industry for mineral flotation processes.

Safety and Storage:

• Octadecyltrimethylammonium bromide should be stored in a cool, dry place, away from water and strong oxidizing agents.

• Appropriate personal protective equipment, such as gloves and safety goggles, should be worn during use to prevent accidental contact or inhalation.

• This chemical should be handled and disposed of in accordance with local regulations and standards.

When purchasing and using octadecyltrimethylammonium bromide, refer to the Material Safety Data Sheet (MSDS) provided by the supplier to ensure safe and compliant usage.