In mild hydrocracking (MHC), the main objectives are to obtain a certain minimum conversion between 15–50% as well as meeting specific product properties, such as sulfur content, density, cloud point and cetane number. At typical pressures in the 60-110 bar range, meeting these parameters can be challenging and cycle lengths are often determined not by conversion rates, but by a failure to comply with specifications.
Topsoe’s range of MHC catalysts and technologies enable you to meet these challenges, whatever your product specifications. Our mild hydrocracking catalysts deliver excellent nitrogen tolerance, resulting in very stable hydrodenitrogenation (HDN) and hydrodesulfurization (HDS) activity throughout the cycle.
Our Staged Partial Conversion (SPC) hydrocracking process enables high-quality ultra-low sulfur diesel (ULSD) to be produced in an fluid catalytic cracking (FCC) pretreater. With no overtreating of the FCC feedstock, the process optimizes your hydrogen use and costs, while ensuring a stable heat balance in the fluid catalytic cracking (FCC) unit.
Catalysts
Catalysts
The performance catalysts we supply for this application are listed below.
CatalystsTK-921
TK-921 is part of Topsoe’s hydrocracking red series developed for maximum hydrogenation. This is an amorphous hydrocracking catalyst with high selectivity for middle distillates. TK-921 provides high end point reduction at low conversion and hydrogenation of the heavy end of the feed, as well...
CatalystsTK-925
TK-925 is part of Topsoe’s hydrocracking red series developed for maximum hydrogenation. This is a hydrocracking catalyst optimized for maximum production of middle distillate products with very low aromatic content and excellent properties. It is also very suitable for mild hydrocracking...
CatalystsTK-926
TK-926 is part of Topsoe’s hydrocracking blue series, developed for maximum cold flow properties of diesel. This is a catalyst with excellent selectivity to diesel. TK-926 is also very suitable for mild hydrocracking applications, where high stability and excellent cold flow properties of the...
CatalystsTK-931
TK-931 is part of Topsoe’s hydrocracking red series developed for maximum hydrogenation. It is a low zeolitic NiW catalyst with high selectivity for middle distillates. TK-931 provides excellent middle distillate yield with low overcracking. Furthermore, TK-931 enhances the quality of the...
CatalystsTK-939 D-sel™
TK-939 D-sel™ is part of Topsoe’s hydrocracking D-sel™ series for maximum diesel yields. TK-939 D-sel™ is a low zeolitic NiW catalyst with high selectivity for middle distillates. As a result of a novel production technology, TK-939 D-sel™ provides excellent middle...
CatalystsTK-941
TK-941 is part of Topsoe’s hydrocracking red series developed for maximum hydrogenation. TK-941 has a high selectivity to middle distillates, and it can be used in applications where high cracking activity and high middle distillate yield are required, and where high light-ends yield is...
CatalystsTK-943
TK-943 is part of Topsoe’s hydrocracking blue series developed for maximum cold flow properties of diesel. TK-943 is a medium- to high-activity hydrocracking catalyst with excellent selectivity to diesel. It is optimized for maximum production of middle distillate products with good cold flow...
CatalystsTK-947
TK-947 is part of Topsoe’s hydrocracking red series developed for maximum hydrogenation. TK-947 is recommended for applications where high cracking activity and high middle distillate yield are required. Also, it is an excellent choice for mild hydrocracking (MHC) applications, where high...
CatalystsTK-949 D-sel™
TK-949 D-sel™ is part of Topsoe’s hydrocracking D-sel™ series for maximum diesel yields. TK-949 D-sel™ is a zeolitic NiW catalyst with high selectivity for middle distillates. It can be used in applications where high cracking activity and high middle distillate yield are...- Catalysts
TK-951
TK-951 is part of Topsoe’s hydrocracking red series developed for maximum hydrogenation. TK-951 is a high-activity hydrocracking catalyst, providing optimum diesel and naphtha yields, while minimizing overcracking. It has a strong hydrogenation function that improves the properties of the... - Catalysts
TK-961
TK-961 is part of Topsoe’s hydrocracking red series developed for maximum hydrogenation. TK-961 is a zeolitic NiW based hydrocracking catalyst with very high activity and a very high nitrogen tolerance. TK-961 provides balanced naphtha and middle distillate yields, minimizing overcracking,...
Equipment
Equipment
The proprietary equipment we supply for this application are listed below. Also see our reactor internals overview for more.
EquipmentCatalyst Support
Our Catalyst Support is designed to support the combined weight of the catalyst, support material and oil.
EquipmentDistributor Tray
Our Vapor Lift Distributor Tray (VLT) ensures uniform distribution of liquid and gas over the entire cross section area of the catalyst bed.
EquipmentInlet Diffuser
Our Inlet Diffusers are optimized and customized for every unit, taking into account all your reactor flow parameters and reactor geometry.
EquipmentOutlet Collector
Our Outlet Collector ensures even flow distribution in the bottom bed to maximize catalyst utilization and prevents bed migration to downstream piping and equipment.
EquipmentQuench Mixer
Our Quench Mixer ensures efficient mixing of catalyst bed effluents from both above and from the cold quench stream.
EquipmentRedistribution Tray
Our Redistribution Tray ensures uniform redistribution of the mixer effluents to the catalyst bed below.
EquipmentScale Catcher
Our Scale Catching technology is a proven and economically feasible solution to delay pressure drop development and significantly increase unit utilization.
Services
Services
The services we supply for this application are listed below.
ServicesCatalyst Loading
All plants – even those with lots of turnaround experience – can run into trouble during loading. When a problem occurs, it can lead to longer turnarounds and, in the worst case, result in an underperforming catalyst. That makes proper loading an important step in profitable plant operation. Topsoe...
ServicesGeneral Technical Service
Optimal interaction between catalyst and technology is crucial if your plant is to perform at its best. Topsoe’s General Technical Service employs the full weight of our knowledge and experience to advise, inform and guide you towards improvement. All General Technical Service is provided as in-...
ServicesPlant Assessment / Optimization
Refineries and chemical plants are complex and vulnerable to changes over time. These changes can degrade performance and impact negatively on day-to-day operations and, ultimately, your bottom line. Whether you choose a catalyst performance evaluation or full-scale process and catalyst...
ServicesSampling & Analysis
As a general rule, the more you know about a plant or unit’s operating conditions, the better you’ll be able to keep performance, cost-efficiency and profits high. Our Sampling & Analysis service is your direct route to the detailed insight it takes to make better decisions. During start-ups...
ServicesStart-up & Reduction / Activation
Starting up your plant or unit is a complicated and time-consuming procedure that involves monitoring numerous parameters and ensuring the right start-up sequencing. If not performed correctly, it can result in delays or even damage to your catalysts, unit or plant. Our Start-up & Reduction/...
ServicesTroubleshooting
Catalysts and processes normally operate smoothly, yet suboptimal performance can occur from time to time. Since most issues have multiple root causes – usually originating in external factors – the process of solving an issue can be difficult and complex. Our Troubleshooting service draws on the...
Project development
Project development
Project development servicesFacilitating Investments
Benefit from the extensive experience of our project finance teams.
Project development servicesProject development
Holistic and integrated approach from idea to financial close.
Process licensing
Process licensing
We offer a full range of process solutions, ranging from technology process licensing to revamps of existing units.
- Process licensing
Back-end shift partial conversion (BES)
The once-through process that converts heavy gas oils to on-spec diesel Refiners often find that the end boiling point of their hydrotreated diesel product is slightly higher than allowed for the diesel pool. Topsoe’s back-end shift partial conversion hydrocracking process (BES) significantly... - Process licensing
Catalytic dewaxing
Significant cold flow improvement The cold flow properties of higher end-point feeds, tight oils, or renewable feeds need to be carefully managed in diesel hydrotreaters operating in cold regions or winter seasons. The freezing point of paraffin in the upper ULSD boiling range is critical because... 
Process licensingRevamping hydroprocessing units
The Topsoe Approach There are many good business reasons for considering revamping a hydroprocessing unit, for instance to react faster to fluctuations in crude oil supply and process more refractive and difficult feeds; to increase unit capacity; comply with stricter product specifications; or to...
