N-Methylaniline (NMA) | CAS 100-61-8

N-Methylaniline (NMA) | CAS 100-61-8

A Technical Overview of Its Role as an Octane Booster in Gasoline

1. Chemical Profile

• Name: N-Methylaniline (NMA)

• Synonyms: Methylphenylamine, N-Methylbenzenamine

• Molecular Formula: C₇H₉N

• Molecular Weight: 107.15 g/mol

• Appearance: Colorless to light yellow liquid

• Boiling Point: 197 °C

• Solubility: Soluble in ethanol, ether, benzene, and partially in water

2. Importance of Octane Rating

The octane number is a key indicator of gasoline quality, measuring its ability to resist engine knock—the premature detonation of the fuel-air mixture inside an engine cylinder. Knock can damage the engine, reduce efficiency, and increase emissions. Enhancing octane number improves fuel stability, combustion control, and vehicle performance.

3. Mechanism of Octane Enhancement

N-Methylaniline functions as a non-traditional antiknock additive. When blended at levels typically between 1–3% v/v, NMA:

• Delays ignition timing by moderating the chain reactions in combustion.

• Stabilizes the combustion process, reducing the probability of uncontrolled detonation.

• Acts as a free radical scavenger, thereby suppressing auto-ignition pathways.

Studies report that 1% NMA can raise gasoline octane by 2–4 units, while higher concentrations (2–3%) may deliver improvements of 5–7 points, depending on the base fuel composition.

4. Comparative Advantages

• Lead-free alternative: Unlike tetraethyl lead (TEL), NMA does not introduce heavy metal contamination.

• Environmental profile: Biodegradable, with no halogen content; lower persistence than MTBE.

• Low vapor pressure: Reduced volatility makes it safer to handle, store, and transport.

5. Industrial Applications

• Fuel industry: Widely adopted in refinery blending and downstream fuel distribution.

• Corrosion inhibition: Neutralizes acidic combustion by-products, protecting engine components.

• Secondary uses: Also serves as an intermediate in dyes, pharmaceuticals, agrochemicals, and antioxidants, though its largest volume use is in gasoline octane enhancement.

6. Safety and Handling Notes

• Classified as toxic aromatic amine; requires proper PPE (gloves, goggles, protective clothing).

• Store in a cool, ventilated environment, away from oxidizing agents and ignition sources.

• Transport in sealed iron drums or IBC tanks or ISOTANK under international chemical safety standards.

  
  

Our Supply Commitment
As a professional chemical exporter, Royalchem provides high-quality N-Methylaniline with guaranteed purity and stable supply. Our NMA is packed in drums or IBC  or ISOTANK, ensuring safe delivery worldwide. By partnering with reliable logistics channels, we support both large-scale refiners and independent fuel distributors.