October 2012

Special Report: Process Control and Information Systems

Use a systematized approach of good practices in pygas hydrogenation via APC

APC with inferential modeling was successfully applied to pygas hydrogenation units. The lengthening of the catalyst run length limits downtime for both the pygas unit and upstream units such as the steam cracker.

As illustrated in Fig. 1, steam crackers produce many basic building blocks for the polymer industry, along with aromatic-rich gasoline (pygas). When naphtha is used as the feed for cracking furnaces, pygas yields increase significantly. Table 1 shows the typical pygas yield and composition for naphtha cracking. Pygas is a large contributor to benzene production capacities.     Fig. 1. Pygas production and other products   from a steam cracker. Before the pygas can be routed to downstream units (aromatics extraction, etc.), unstable compounds such as diolefins and styrenics must be removed. Also, olefins and sulfur must be eliminated to ensure that final

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