Liquefied gas can be used a fuel for vehicles and equipment along with oil products. It is a mixture of hydrocarbons liquefied under pressure which are transformed to a low-boiling flammable liquid with the toxicity class. Technical propane-butane is one of the types of hydrocarbon liquefied gases.
Propane-butane gas consists of propane and butane in different proportions. Propane alone can expand uncontrollably in conditions of increasing temperature, which can lead to an explosion. But butane, although it has a high thermal conductivity, freezes at a temperature below 0 ° C. Therefore, to provide the maximum safety to the fuel system and eliminate the risk of fuel mixture freezing, propane-butane gas is used.
PBT parameters are regulated by GOST 52087 and meet the following standards:
- The share of butane in the total volume is up to 60% (and for cold climatic regions – up to 25%)
- Liquid residue at 20 ° C – up to 1.6%.
- The presence of hydrogen sulphide (including mercaptan sulfur compounds) – up to 0.013%.
- The intensity of the odor is from 3 points.
- Absence of water and alkalis in total mass.
Density of the propane-butane mixture indicates the weight of 1 liter of gas and depends on the composition (propane and butane ratio in the total volume) and ambient temperature. For example, if the gas density at a temperature of 5 ° C is 562 kg / m3, then for 1 liter it is 0.562 kg.
If the temperatures are equal, gas density with contains more butane than propane will be higher than in the mixture with more propane.
The specific weight of propane-butane which shows the weight/volume ratio is directly proportional to the density of the gas.
Application of technical propane-butane:
- Fuel for automotive transport
- Domestic fuel
- Raw material for petrochemical plants
Properties of propane-butane
Technical propane-butane can be used in any climate, but the temperature of the air surrounding the gas reservoir should not be below -20-25 ° C. Technical propane-butane is well mixed with air and burns evenly and completely, leaving no soot. Such fuel is more environmentally friendly and cheaper than gasoline. It has high operational properties and can be stored in tanks for a long time, unlike natural gas
Liquefied gases are inflammable and explosive, they can easily ignite, therefore their transportation in bombs should be made with provision of the maximum safety requirements.