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Propane

C3H8
Propane

Made of

carbon hydrogen

Propane is a flammable hydrocarbon gas that liquefies easily under pressure, making it very convenient for storage and transport in cylinders. It is a common fuel for portable applications.

Description of what it is like

  • State: Gas at atmospheric pressure, liquid inside the tank.
  • Odor: Naturally odorless, but an odorant (mercaptan) that smells like rotten eggs or cabbage is added to detect leaks.

Origin and where to find it

  • Source: Found mixed with natural gas and crude oil in underground deposits.
  • Process: Separated during the refining of Crude Oil or natural gas processing.

Minimum processing required

  1. Extraction: Obtain natural gas or oil.
  2. Fractionation: Separate propane from other hydrocarbons (methane, butane, ethane) by distillation or refrigeration. Requires advanced industrial technology.

Tools needed to work on it

  • Pressure Tanks: Steel or composite cylinders to store it as a liquid.
  • Regulators: To reduce tank pressure to a safe working pressure.
  • Hoses and Burners: Compatible with LPG (Liquefied Petroleum Gases).

Common forms of use

  • Domestic Fuel: Stoves, ovens, water heaters.
  • Torches: For welding copper pipes (plumbing) and brazing.
  • Oxy-cutting: Used with oxygen as a cheaper alternative to acetylene for cutting steel (although it does not reach the temperature to weld steel by fusion).

Possible substitutes

  • Acetylene: For high-temperature welding.
  • Biofuel: Ethanol or biogas for heating/cooking.
  • Charcoal: For forging and cooking.
  • Wood: Basic heating.

Limitations and common failures

  • Flame Temperature: Burns at about 1980°C in air and 2820°C with oxygen. This is enough for soldering copper or silver, but low for efficiently melting steel compared to acetylene (3100°C).
  • Pressure: Tank pressure drops if gas is consumed too quickly (the liquid cools as it evaporates), “freezing” the tank.

Risks and safety

  • Asphyxiation: It is heavier than air; it accumulates in low areas (basements, pits) displacing oxygen.
  • Explosion: Highly flammable. Leaks in enclosed spaces are very dangerous.
  • Frostbite: The gas expands and cools rapidly as it leaves the tank, which can cause cold burns.

Properties

  • colorless gas
  • odorless (odor added)
  • liquefiable at low pressure
  • high calorific value

Used for

  • heating
  • cooking
  • brazing
  • metal cutting (with oxygen)

Manufacturing / Process

By-product of natural gas processing and petroleum refining.