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Designing the CDU/VDU for Opportunity Crudes

New units for processing heavy crudes should not be designed using conventional practices or run length with be short, and product yields & quality poor.
Tags: CDU, VDU

Desalting Heavy Canadian Crude

Heavy Canadian crudes pose serious challenges during the process of desalting due to their inherent properties. This article presents an overview of critical desalter design and operating considerations to overcome various operational issues.
Tags: CDU, VDU

Maximising Diesel Recovery From Crude

The CDU/VDU process flow scheme is reviewed, including equipment design and operating fundamentals used to maximise straight-run diesel recovery. Factors important to increasing diesel yield are discussed in detail.
Tags: CDU, VDU

Lube Vacuum Column Revamp

The basis of a lube vacuum column revamp and its results are discussed. The primary goals were to increase lube product fractionation, minimise HVGO product contaminants and improve vacuum bottoms specifications for asphalt production.
Tags: CDU, VDU

Crude Overhead System Design Considerations

Proper crude unit overhead system is important when building a new unit or revamping an existing one to process different crudes. Overhead condenser designs should meet the specific processing objectives, such as distillate yield, run length and energy recovery.
Tags: CDU, VDU

Revamping Atmospheric Crude Heaters

The revamp of an atmospheric crude unit heater, which was suffering from coking caused by asphaltene precipitation and poor burner stability, resulting in a significantly increased heater run length.
Tags: CDU, VDU

FCC Gas Concentration Unit Stripper Revamp

Unit charge rate and reactor conversion were increased by elimination of stripper column flooding. Chemical-grade propylene specifications were met and C2 excursions in mixed C2/C3 streams were eliminated.
Tags: FCCU

Main Fractionator Water Wash Systems

When properly designer and operated, main fractionator wash water systems can remove salt with little upset. Misconceptions concerning the minimum column overhead temperature and operation when producing FCC heavy naphtha are discussed.
Tags: FCCU

Designing Vacuum Units

When designing vacuum units for processing heavy Canadian crudes, reliability costs can be high if the feedstock’s thermal instability is not fully appreciate. Process design considerations affection VGO yield and quality are discussed.
Tags: CDU, VDU

Better Fractionation Hikes ULSD Yields, Hydrotreater Run Lengths

Improved CDU, FCC and Coker main column fractionation maximizes diesel boiling range yields while eliminating hard-to-treat sulfur components from the hydrotreater feed. Hydrotreater run lengths can be materially improved by improving the segregation of easy-to-treat and hard-to-treat sulfur species in ...
Tags: CDU, VDU