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Houston, TX, United States

Carlson K.,Criterion Catalysts
Petroleum Technology Quarterly

Developments including improved active site dispersion and assembly are designed for higher-valued operation in a range of processing units. A discussion covers challenges associated with refinery margins; the global drive towards clean fuels; Criterion Catalysts & Technologies' Centera technology, which is used in refining applications, e.g., ULSD production, hydrocracker pre-treat (HCPT), and FCC pre-treat; active site dispersion; maximum sulfidation; optimal assembly of active sites; MoS 2 particle dispersion; FCC pre-treat gains; and the relative performances of Criterion catalysts. Source

Robinson P.R.,Criterion Catalysts
4th Regional Process Technology Conference 2012

Purpose of this presentation - To give an overview of the role of hydroprocessing in petroleum refining. Crude oil to pure products - Properties of crude oil - Petroleum refining overview - Chemicals in refinery streams - Reactions & mechanism. Catalysis fundamentals. Hydroprocessing catalysts. Source

Huffmaster M.,PE Inc. | Maldonado F.,Criterion Catalysts
Sulphur 2014 30th International Conference and Exhibition

The Tail Gas Unit (TGU) process has been developed to remove sulfur compounds from Claus tail gas in order to comply with stringent emission regulations. From the early 1970s to today TGUs have been improved to meet higher levels of performance for ever tighter environmental requirements and to reduce capital or operating cost. Reactor performance is a critical parameter in achieving TGU environmental performance. Conversion of sulfur species to H2S is a function of catalyst activity, reactor space velocity and temperature. Reactor modeling, process chemistry and chemical equilibrium influence tail gas unit performance and provide a framework to examine the effects of space velocity and temperature. Assessment of the impact of these principal variables on both catalyst bed design and performance is the subject of this paper. Copyright © 2012 CRI/Criterion Inc. All rights reserved. Source

Rogers M.,Criterion Catalysts
American Fuel and Petrochemical Manufacturers, AFPM - AFPM Annual Meeting 2015

Alon Big Springs Refinery, with Criterion Catalysts, has worked for over ten years to achieve an impressive track record of successes in their distillate hydrotreater, boosting diesel capacity and production by up to 20%, and greatly improving unit flexibility. With the current strong market for diesel, this gain has allowed them not only to track their product demands, but it has dramatically boosted profitability for their shareholders. The sustained collaboration between Alon and Criterion has been a crucial factor in the success of the whole refinery. In the early 2000's Criterion worked with Shell Global Solutions to find a cost-effective way to bring Alon's distillate hydrotreater unit to ULSD production. The low operating pressure, difficult feed, and limited hydrogen availability were serious challenges. The refinery chose to install new reactor vessels with reactor internals from Shell Global Solutions. The catalyst was Criterion's first-generation Cobalt-Moly ULSD product. In the years following their successful transition to ULSD production, Alon continued to work closely with Criterion. The challenge was to extend the catalyst life cycle and increase straight run diesel (SRD) and light cycle oil (LCO) cut-points for improved refinery economics. They needed to push the cycle from about nine months to at least 12 months in order to synchronize with the semi-regen reformer regenerations. Increasing demand for diesel was putting pressure on the refinery to raise cut-points of their straight-run and LCO to maximize diesel yields. In 2010, Alon loaded a first-generation CENTERA™ sandwich system which gave a large boost in activity and enabled significant gains towards increasing the unit's flexibility and profitability. In 2014 Alon implemented a revamp in their crude distillation unit. One of the main objectives of that revamp was to boost straight-run diesel yield which would increase available feed to the ULSD unit for higher diesel production. Again, the success of this project was crucial for the refinery to increase profitability in the face of shifting market demand. Criterion's second-generation CENTERA™ sandwich system with DC-2635 CoMo and DN-3636 NiMo has given the additional activity needed to process the additional difficult feed and, at the same time, maintain catalyst cycle flexibility, once again contributing to Alon's success. Source

Robinson P.R.,Criterion Catalysts
12AIChE - 2012 AIChE Spring Meeting and 8th Global Congress on Process Safety, Conference Proceedings

Hydrotreating removes sulfur, nitrogen, olefins, aromatics, and other contaminants from distilled crude oil fractions and intermediate process streams. Hydrocracking converts heavy oil fractions into lighter, more valuable products. Both processes share many common features, so they often are discussed together as "hydroprocessing". Most hydroprocessing units employ specialized catalysts and consume hydrogen. Most hydroprocessing catalysts are comprised of active metals and promoters on solid supports. Hydroprocessing configurations can include fixed-bed reactors, ebullating bed reactors, or slurry-phase reactors, each of which requires a different kind of catalysts or a non-catalytic additive. This is an abstract of a paper presented at the 2012 AIChE Spring National Meeting and 8th Global Congress on Process Safety (Houston, TX 4/1-5/2012). Source

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