You are currently viewing: Literature



Improved hydrocracking

leading-edge Catalysts coupled with outstanding Technical service. Criterion Catalysts & Technologies (Criterion) offers a broad range of zeolite catalysts to satisfy a variety of refinery hydrocracking objectives. We also provide the feed pretreatment catalysts that are vital to preserving the function of the main cracking catalysts.

Hydrocracking is replacing fluidised catalytic cracking as the refinery conversion process of choice. The reasons are simple: the shift from gasoline to diesel in many parts of the world; the flexibility of the hydrocracking process, which makes it relatively easy to alter the product slate to meet changing market demands; the ability of the process to make high-quality transport fuels, particularly ultra-low-sulphur diesel, directly from difficult-to-process feeds; and, finally, the ease with which hydrocrackers can be integrated with ethylene crackers in the petrochemicals sector.

The performance of hydrocracking units is fundamentally dependent on the zeolite catalyst used to break down the heavier oil molecules. However, as feed quality generally declines, it is becoming increasingly common to find units whose performance, notably run length, is limited by the decline in activity of the feed pretreatment catalyst, the role of which is to protect the zeolite from harmful sulphur and nitrogen compounds and trace metals.

CATALYST SELECTION
We work closely with refiners to select the most appropriate hydrocracking and pretreatment catalysts to meet their individual process needs.

This involves a detailed analysis in which reference will be made to feedstock quality; the desired product slate; the design of the hydrocracker and its normal operating regime; the amount of hydrogen available; and the target cycle length. Process modelling and pilot plant trials are part of the toolbox used to pinpoint the best catalysts for individual hydrocrackers and also to develop the most effective unit operating strategy.

TECHNICAL SERVICE
Criterion customers benefit from the support of knowledgeable and experienced technical service engineers at every stage of the process cycle.

The technical support available to customers goes beyond advising on the selection of suitable catalysts. We routinely provide consultation during catalyst activation and, thereafter, we help customers with information as they seek to optimise the performance of their hydrocrackers. Using our Cat-Check knowledge management system, we can help them to build a clear picture of the way the unit is performing as the process cycle  develops. This helps to customers to optimise operating conditions to best effect, understand process anomalies and troubleshoot any process problems quickly and efficiently. We are always looking for ways to provide information that will help to increase a unit’s profit margin.

View More

Catalysts for improved lubricating oil

Catalyst performance is paramount in producing high-value lubricants. Refiners trust catalysts from Criterion Catalysts & Technologies (Criterion) to deliver high yields of top-quality base oils. Consequently, our products are to be found in lubricant plants across the world.

Lubricant ...


Diesel dewaxing catalysts

Maximising middle distillate yields while maintaining excellent cold flow properties. In recent years, diesel dewaxing has emerged as a powerful
technique for meeting product specifications and creating additional margin.

To avoid wax compounds crystallising out and causing engine ...


Criterion Catalysts & Technologies focus on performance

Considerable resourcefulness is required to run a refinery profitably when faced with shifting product demand patterns, tighter specifications, rising energy costs, tougher environmental regulations and variable crude quality.

At the same time, the world order is changing. The economic ...


ASCENTâ„¢ DC-2534: performance that delivers greater value for your investment

Refiners who are planning to replace their ULSD catalysts have important decisions to make. The factors they must consider include catalyst performance, hydrogen consumption and catalyst regeneration/reuse options, all of which will have a direct bearing on their costs and the economic value of their ...


Transforming ULSD economics

The ability to produce diesel containing less than 10-ppm sulphur is no longer a differentiator in most  markets. Progressive refiners are pushing to make  ultra-low-sulphur diesel (ULSD) with improved fuel  properties from tougher feedstocks and often within  tight hydrogen budgets. ...


Residue upgrading using fixed-bed hydroconversion

Dealing more effectively with the bottom of the barrel is high on the refining industry’s agenda for a several reasons. Crude oil feedstocks are becoming heavier, which is making lighter crudes more expensive. Environmental pressures are undermining the market for heavy fuel oil. In addition, the ...


Residue upgrading using ebullated-bed hydrocracking

Dealing more effectively with the bottom of the barrel is high on the refining industry’s agenda for the following reasons. Crude oil feedstocks are becoming heavier, which is making lighter crudes more expensive. Environmental pressures are undermining the market for heavy fuel oil. In addition, ...


FCC pretreatment catalysts

High-performance catalyst systems tailored to meet refiners’ operating objectives. Refiners worldwide are reporting significantly enhanced refinery economics after working with Criterion Catalysts & Technologies to optimise the performance of their fluidised catalytic cracking (FCC) pretreatment ...


Naphtha hydrotreating catalysts

Dealing with the more challenging streams. Criterion is a world-leading supplier of naphtha hydrotreating catalysts, the key to the effective removal of sulphur and nitrogen compounds from this valuable refinery stream. We supply about one-third by weight of all the naphtha hydrotreating catalyst purchased ...


Improved hydrocracking

leading-edge Catalysts coupled with outstanding Technical service. Criterion Catalysts & Technologies (Criterion) offers a broad range of zeolite catalysts to satisfy a variety of refinery hydrocracking objectives. We also provide the feed pretreatment catalysts that are vital to preserving the function ...