February 2018

Special Focus: Materials Manufacturing

Metallurgy solution to prevent polythionic acid stress corrosion cracking in hydroprocessing

Hydrotreating is a staple process found in nearly every refinery. The process removes undesirable feed contaminants, such as sulfur, nitrogen and metals, and saturates olefins and/or aromatics to produce high-quality products.

Hoehn, R. K., Bradley, S. A., M. W. Mucek, Honeywell UOP; Anada, H., Osuki, T., Nippon Steel and Sumitomo Metal Corp.

Hydrotreating is a staple process found in nearly every refinery. The process removes undesirable feed contaminants, such as sulfur, nitrogen and metals, and saturates olefins and/or aromatics to produce high-quality products. Hydrotreating has moved to the forefront in recent years as fuel standards require that the sulfur content of transportation fuels be reduced to very low levels. Hydrocracking is a more severe form of hydrotreating. The objective of the hydrocracker is to not only remove the feed contaminants, but also to reduce the molecular weight of the products. While hydroprocessing units process a wide range of feeds with different processing objectives, one commonality is that

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