Pygas

Pyrolysis gasoline. Pygas is a naphtha-range product with a high aromatics content used either for gasoline blending or as a feedstock for a BTX extraction unit. Pyrolysis gasoline is produced in an ethylene plant that processes naphtha, butane or gasoil. (Abbreviation).
Found on http://www.encyclo.co.uk/visitor-contributions.php

Pygas

Pyrolysis gasoline. A naphtha-range product with a high aromatics content used either for gasoline blending or as a feedstock for a BTX extraction unit. Pygas is produced in an ethylene plant that processes butane, naphtha or gasoil.
Found on http://www.encyclo.co.uk/local/21049
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