March 2021

Special Focus: Petrochemical Technology

Best practices for pygas-based styrene extraction

Pyrolysis gasoline (pygas) is a by-produced fraction of hydrocarbons generated from a steam cracker.

Liu, Z., Joshi, S., Ma, H., Zhang, R., Sulzer GTC Technology

Pyrolysis gasoline (pygas) is a by-produced fraction of hydrocarbons generated from a steam cracker. Rich in aromatics content, particularly for benzene and toluene, pygas was historically blended into the gasoline pool as a high-octane number component. In this modern era, due to stringent benzene specifications in the gasoline pool and growing demand for the aromatic molecules from petrochemicals and chemicals manufacturing, the majority of pygas is fed to aromatics extraction units for benzene, toluene and mixed xylenes (BTX) recovery. How much pygas can be by-produced from a steam cracker primarily depends on the type of feed to the cracker and the cracking severity. TABLE 1 lists the y

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