Propane-butane (autogas) became one of the main alternative fuels for cars. This is a hydrocarbon mixture of propane (50 +/- 10% in accordance with GOST) and butane.
Hydrocarbon gases are produced from natural gas and associated oil. At refineries they are divided into fractions with separate extraction of propane, ethane and other gases. Propane and butane are the mostly applied gases in various industries. Under high pressure over a small area they are transferred from the gaseous state to the liquid (liquefied) to facilitate transport in the tanks. Depending on the purpose of the mixture, the ratio of the parts of the gases in it can vary.
The PBA gas (propane-butane for cars) is used as a fuel in car engines. Filling with propane-butane is becoming more popular, because for the car owner it is 50% cheaper than gasoline. But this gas, like gasoline, can be of different quality.
- Technical parameters of PBA are regulated by GOST 52087:
- Propane content is 50 +/- 10%
- Total unsaturated hydrocarbons – up to 6%.
- The saturated vapour pressure at -20 ° C is from 0.07 MPa.
- Mass fraction of hydrogen sulphide (including mercaptans) – not more than 0.01%.
- Does not contain water and alkalis.
- The intensity of the odor is from 3 points according to GOST 22387.
Quality of the gas mixture and its suitability for use in cars depend on its composition. Pure propane in bombs is an explosive mixture that expands when heated. Butane has a high thermal conductivity, but it freezes at a minimum below zero temperature. Therefore, it is their combination that gives the optimum result when used as a fuel. For the cold season, winter propane is used where a propane mass fraction of about 90%.
Another important indicator is vapour pressure. It provides the uninterrupted supply of gas to the engine during the cold season. Lack of pressure slows down the gas supply from the cylinder until the engine is completely muffled.
Liquefied automotive gas must not contain a liquid residue. For comparison, in technical propane-butane, its mass fraction reaches 1.6%. The liquid residue does not evaporate and does not burn, but settles on the filter and the walls of the cylinder, so the system requires constant cleaning. This reduces the service life of a car gas cylinder, which on average is 10 years.
BUY AUTOMOTIVE PROPANE-BUTANE (AUTOGAS)