Ammonia and Derivatives

AMMONIA & ITS DERIVATIVES

Introduction and Background

Ammonia (NH₃) is a colorless gas with a pungent odor, composed of nitrogen and hydrogen. It is one of the most important and widely produced industrial chemicals globally.
Naturally occurring from the decomposition of organic matter, ammonia is also synthesized on a large scale primarily through the Haber-Bosch process, reacting nitrogen gas (N₂) with hydrogen gas (H₂) under high temperature and pressure in the presence of a catalyst.

Ammonia is a critical building block for many nitrogen-based compounds — collectively called Ammonia Derivatives — which are essential in agriculture, pharmaceuticals, textiles, chemical manufacturing, refrigeration, and environmental sectors.

Main Types of Ammonia and Ammonia Derivatives

Technical Details, Chemical and Physical Characteristics

3.1 Anhydrous Ammonia (NH₃)

• CAS Number: 7664-41-7
• Molecular Weight: 17.03 g/mol
• Appearance: Colorless gas (compressed as liquid)
• Odor: Strong, pungent
• Melting Point: -77.7°C
• Boiling Point: -33.34°C
• Density: 0.73 g/L (gas at STP)
• Solubility: Highly soluble in water (forms ammonium hydroxide)
• Vapor Pressure: 8.5 atm at 20°C
• Reactivity:
  • Reacts with acids to form ammonium salts.
  • Highly alkaline, reducing agent.

3.2 Aqueous Ammonia (Ammonium Hydroxide, NH₄OH)

• Solution: Ammonia gas dissolved in water.
• Concentration: Typically 25-30% in industrial use.
• Appearance: Clear, colorless liquid
• pH: Strongly basic (pH ≈ 11-12)
• Applications: Cleaning agents, water treatment, chemical synthesis.

3.3 Ammonium Nitrate (NH₄NO₃)

• CAS Number: 6484-52-2
• Molecular Weight: 80.04 g/mol
• Appearance: White crystalline solid
• Melting Point: 169.6°C
• Decomposition: Highly exothermic; risk of detonation under confinement.
• Applications:
  • Fertilizer (high nitrogen content).
  • Explosives (ANFO - Ammonium Nitrate Fuel Oil).
  • Cold packs.

3.4 Ammonium Sulfate ((NH₄)₂SO₄)

• CAS Number: 7783-20-2
• Molecular Weight: 132.14 g/mol
• Appearance: White granular solid
• Solubility: Highly soluble in water.
• Applications:
  • Fertilizers.
  • Flame retardants.
  • Food additives (acid regulator).

3.5 Ammonium Chloride (NH₄Cl)

• CAS Number: 12125-02-9
• Molecular Weight: 53.49 g/mol
• Appearance: White crystalline powder
• Solubility: Soluble in water.
• Applications:
  • Metalwork (flux for soldering, galvanizing).
  • Batteries (electrolyte in dry cells).
  • Pharmaceuticals (expectorant).

3.6 Urea (CO(NH₂)₂)

• CAS Number: 57-13-6
• Molecular Weight: 60.06 g/mol
• Appearance: White crystalline solid
• Applications:
  • Nitrogen fertilizer.
  • Resin production (urea-formaldehyde).
  • Animal feed supplements.

Differences Between Major Ammonia Derivatives

Applications Across Industries

Agriculture

• Anhydrous Ammonia: Injected into soil as a direct nitrogen fertilizer.
• Ammonium Nitrate & Urea: Solid fertilizers for diverse crops.
• Ammonium Sulfate: Used for crops needing sulfur and nitrogen.

Chemical Industry

• Ammonia: Starting material for nitric acid, hydrazine, amines.
• Urea: Basis for plastics, adhesives (urea-formaldehyde resins).

Refrigeration

• Anhydrous Ammonia: Widely used in industrial refrigeration due to high energy efficiency.

Pharmaceuticals and Healthcare

• Ammonium salts: Used in expectorants, acidifiers, and other formulations.

Explosives Industry

• Ammonium Nitrate: Primary oxidizer in explosives like ANFO.

Household and Industrial Cleaning

• Aqueous Ammonia: Window cleaning agents, degreasers.

Water Treatment

• Ammonia: Used in chloramination (combining chlorine and ammonia) to disinfect drinking water.

Standards and Specifications

Industrial and Regulatory Standards

Typical Specification Ranges

Safety and Handling

• Toxicity: Inhalation of ammonia gas is dangerous; can cause burns, respiratory issues.
• Flammability: Ammonia gas is flammable in high concentrations (15%-28% in air).
• Protective Equipment:
  • Chemical-resistant gloves.
  • Safety goggles.
  • Respirators for high-concentration exposure areas.
• Storage:
  • Anhydrous ammonia: Stored in pressurized tanks.
  • Solutions: Store in corrosion-resistant containers, away from acids.

Always follow GHS, OSHA, NFPA, and local regulations for transportation, labeling, and emergency response.