Butane-Based LPG is a refined hydrocarbon fuel consisting predominantly of n-butane (C₄H₁₀), obtained during natural gas processing and crude oil refining. It is stored and transported as a liquid under low to moderate pressure and vaporizes rapidly when released to atmospheric conditions.
Due to its high volumetric energy density, clean combustion, and lower storage pressure, butane-based LPG is widely preferred in residential cooking, commercial kitchens, aerosol applications, chemical processing, and industries operating in moderate or warm climates.
Chemical Composition & Fuel Quality
* Primary Component: n-Butane (typically ≥95%)
* Isomers: Small traces of iso-butane
* Impurities: Negligible sulfur, moisture, and unsaturated hydrocarbons
* Odorant: Ethyl mercaptan added for leak detection
* Corrosivity: Non-corrosive to steel, aluminum, and copper alloys
High purity ensures stable flame characteristics, consistent pressure behavior, and long equipment life.
Key Characteristics of Butane-Based LPG
1.High Energy Density (Volumetric Advantage)
* Delivers 27–28 MJ per liter, higher than propane on a volumetric basis
* Ideal for space-constrained storage (kitchens, food trucks, portable cylinders)
This makes butane especially attractive for small cylinders and cartridge-based systems.
2.Clean & Smokeless Combustion
* No ash, soot, or smoke
* Extremely low sulfur oxide (SOₓ) and particulate emissions
* Suitable for food preparation, pharmaceuticals, laboratories, and clean industrial processes
Ensures product purity in sensitive applications.
3.Low Pressure Storage & Handling
* Liquefies at significantly lower pressure than propane
* Reduced stress on cylinders, valves, and piping
* Lower energy consumption during bottling and compression
This improves safety, cost efficiency, and equipment longevity.
4.Best Suited for Warm & Mild Climates
* Boiling point of –0.5°C
* Vaporization efficiency decreases in cold climates
* Performs optimally in tropical and temperate regions
Often blended with propane in colder regions to maintain vapor pressure.
5.Economical & Widely Available
* Generally lower cost than propane
* Easily sourced through refinery LPG streams
* Ideal for high-consumption commercial users
Typical Mechanical & Physical Properties
| Property | Approximate Value |
|---|---|
| Chemical Formula | C₄H₁₀ |
| Molecular Weight | 58.12 g/mol |
| Boiling Point | –0.5°C |
| Vapor Pressure @ 20°C | ~2.1 bar |
| Liquid Density | 0.58 – 0.60 kg/L |
| Calorific Value | 27 – 28 MJ/L |
| Flash Point | –60°C |
| Auto-Ignition Temperature | 350 – 460°C |
| Flammability Range | 1.6% – 8.5% |
| Flame Temperature | ~1,970°C |
Storage, Transport & Supply Formats
1.Cylinders
* 5 kg, 12 kg, 14.2 kg, 17 kg, 19 kg, 33 kg
* Suitable for:
* Homes
* Restaurants
* Street food & food trucks
* Small commercial kitchens
2.Bulk / Lorry Load Supply
* Delivered via LPG road tankers
* Stored in stationary above-ground tanks
* Used in:
* Industrial heating
* Textile units
* Ceramics and glass factories
3.ISO Tank Containers
* 20-ft / 40-ft cryogenic or pressurized tanks
* Ideal for:
* Import/export
* Large industrial consumers
* Continuous production plants
4.Bottling & Private Label Supply
* Custom cylinder filling
* Branding and regulatory compliance support
* Suitable for:
* Regional LPG distributors
* Hospitality chains
* Industrial gas suppliers
Applications of Butane-Based LPG
Residential
* Cooking
* Water heaters (geysers)
* Space heating (warm regions)
* Backup fuel systems
Commercial
* Hotels and restaurants
* Catering units
* Food trucks
* Bakeries and tandoors
* Canteens and hostels
* Laundry and dry-cleaning
Industrial
* Metal heating and cutting
* Ceramics and glass manufacturing
* Textile drying and finishing
* Plastic molding
* Pharmaceutical heating
* Chemical reactions
* Aerosol propellant production
* Rubber and foam industries
Agriculture
* Crop and grain drying
* Greenhouse heating
* Pest control fumigation
* Food processing at farm level
Comparison: Butane vs Propane
| Parameter | Butane LPG | Propane LPG |
|---|---|---|
| Boiling Point | –0.5°C | –42°C |
| Storage Pressure | Lower | Higher |
| Cold Climate Suitability | Poor | Excellent |
| Volumetric Energy | Higher | Slightly Lower |
| Cost | Lower | Higher |
| Best Use | Warm climates, indoor | Cold climates, outdoor |
Safety & Compliance
* Odorized for leak detection
* Requires adequate ventilation
* Cylinders fitted with pressure relief valves
* Complies with:
* IS / EN / ASTM LPG standards
* Local explosive and gas safety norms
Complies with IS / EN / ASTM LPG standards and local gas safety regulations.
Advantages Summary
✔ High energy per liter
✔ Clean combustion
✔ Low storage pressure
✔ Cost-effective
✔ Ideal for indoor and commercial use
✔ Minimal maintenance
Butane-Based LPG is a high-efficiency, clean, and economical fuel best suited for warm climates and controlled indoor applications. Its excellent volumetric energy density, low storage pressure, and clean combustion make it an essential energy source for households, hospitality, industrial processing, and specialty chemical uses.