Beumont refinery

Lubricant dewaxing (MWI™ technology)  

Refiners can use MWI™ wax isomerization technology to convert slack wax or other highly paraffinic streams into very high value Group III+ base stocks (high VI –140). Small amounts of valuable winter (low Cloud Point) diesel are also produced as a by-product without need for further processing.

Key benefits

  • Exceptional quality

    • High-quality product with high VI
    • Ultra-low pour capability
    • Haze-free” product

  • Low risk

    • Easily retrofitted into existing hydrotreating units
    • Robust catalyst with nitrogen and sulfur tolerance

  • High performance

    • Increased yield
    • High selectivity

MWI™ services include:  

  • Initial non-confidential consultations
  • Development of licensing proposal
  • Basic engineering package, including basic design specification and operating guide
  • Engineering support during FEED and EPC stages
  • Technology transfer, training, catalyst loading and startup support
  • Performance estimates for catalyst refills

Group III+ production  

Group 3 base stoks flow chart

Valuable flexibility  


Using MWI technology, refiners can produce high-quality Group III+ base stocks. MWI’s processing of slack wax, or a variety of synthetic waxes, can be used to augment a lube plant’s VI balance. This capability makes MWI a valuable option for almost any existing or planned lube plant.


MWI dewaxing process  

Wax is liquified and preheated to reactor temperature and fed to a proprietary fixed bed reactor containing an advanced proprietary selective zeolite catalyst. Paraffinic molecules in the waxy feed are selectively isomerized by this catalyst to branched, lower pour point lube molecules with minimal conversion to high-quality diesel. For some feeds (high oil-in-wax slack waxes, for example) an initial hydrotreating step may be required.

Featured resources

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    Lubricant base stock dewaxing – MSDW™ catalyst – fact sheet

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