Pygas, also known as pyrolysis gasoline or pygas, is a byproduct of the pyrolysis process used to produce ethylene, propylene, and other petrochemicals from naphtha, gas oil, or other feedstocks. Pyrolysis is a high-temperature process that breaks down hydrocarbons into smaller molecules through the application of heat and pressure.
Pygas is a mixture of various hydrocarbons, including olefins, aromatics, and naphthenes, and typically has a high octane rating and a low boiling point. It is a valuable feedstock for producing a range of products, including gasoline, aromatics, and solvents.
One of the most common uses of pygas is as a feedstock for producing benzene, toluene, and xylenes (BTX), which are important building blocks for the production of various chemicals and materials, including plastics, synthetic fibers, and rubber. Pygas can also be used as a blending component for gasoline to increase its octane rating or as a solvent for industrial applications.