Upgraded ebullated bed reactor with less fouling sediment

Abstract

An ebullated bed hydroprocessing system is upgraded using a dual catalyst system that includes a heterogeneous catalyst and dispersed metal sulfide particles to produce less fouling sediment. The dualcatalyst system more effectively converts sediment-forming precursors to produce sediment that is less fouling than sediment produced using only the heterogeneous catalyst and not the dispersed metalsulfide particles. The dual catalyst system provides for a lower rate of equipment fouling for a given sediment production rate and / or concentration. In some cases, sediment production rate and / or concentration can be maintained or increased while equipment fouling is reduced. In some cases, sediment production rate and / or concentration can be increased without increasing equipment fouling.

Description

technical field [0001] The present invention relates to heavy oil hydroprocessing methods and systems, such as ebullating bed hydroprocessing methods and systems, which utilize a dual catalyst system and operate with fewer fouling deposits. Background technique [0002] There is an increasing need to more efficiently utilize and extract fuel value from low-quality heavy oil feedstocks. Low quality feedstocks are characterized by including relatively high amounts of hydrocarbons that nominally boil at 524°C (975°F) or above. They also contain relatively high concentrations of sulfur, nitrogen and / or metals. High-boiling fractions derived from these low-quality feedstocks typically have high molecular weights (often indicated by higher densities and viscosities) and / or low hydrogen-to-carbon ratios, which are consistent with the presence of high concentrations of undesired components, including asphaltenes and carbon residue) related. Asphaltenes and carbon residues are dif...

AI Technical Summary

Problems solved by technology

In addition, sediment generation and equipment fouling limit downstream processing of high boiling fractions

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