Baytown refinery at night

Lubricant base stock dewaxing (MSDW™ technology)  

Demonstrated in nearly 20 years of proven performance, MSDW™ selective dewaxing technology delivers outstanding activity, yield, selectivity, run length and durability. Refiners rely on MSDW catalyst technology to improve base stock cold-flow properties and convert wax to high viscosity index (VI) lubricant.

Key benefits

  • Higher performance

    • Increased yields
    • Improved selectivity
    • Higher activity
    • Long life

  • Exceptional quality

    • Proven performance
    • Simple fixed-bed operation
    • Tolerant to feed upsets

  • Low operating cost

    • API Groups II, II+, III and III+ classification
    • Outstanding low-temperature performance
    • High oxidation stability
    • Low and high viscosity grades

MSDW 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

Market leader  

MSDW is currently used in 21 units, with more than 30 licenses. More than 55 percent of Group II and Group III is currently produced over MSDW. None of the more than 20 commercial units operating with MSDW catalyst has changed the catalyst fill due to aging, poor performance due to feed contamination, refinery upsets or reaching end of cycle. Two of the units have operated for more than 12 years, with one still using the original catalyst fill.

Hydrofinishing with MAXSAT chart

Catalytic dewaxing technology  

Proprietary shape-selective catalysts containing zeolites and small amounts of noble metals are specifically designed to isomerize n-paraffins and saturate aromatics with maximum selectivity to lubes and minimal cracking to fuels. The catalysts display superior activity and unsurpassed tolerance to nitrogen, sulfur and aromatic contaminants in the feed. Compatible with a full range of feed from light neutral to Bright stock, MSDW catalyst can process a wide range of feedstocks, from hydrotreated or hydrocracked VGOs and DAOs to hydrotreated raffinates and slack waxes.

Increase profitability  

MSDW catalyst has demonstrated some of the highest base oil yields, maximizing profitability. Extremely high catalyst activity can lower capital costs and improves run length. To put the yield advantage in context: for an average MSDW unit, a difference of 1 percent in base stock product yield is currently worth between $2 million and $4 million per year over producing diesel fuel, or about $7 million to $8 million in annual revenue.

Operational flexibility  

High contaminants tolerance improves stability and reliability, and MSDW is compatible with a full range of feed from light neutral to Bright stock. MSDW catalyst technology is capable of processing a wide range of feedstocks, from hydrotreated or hydrocracked VGOs and DAOs to hydrotreated raffinates and slack waxes. Typical products are base stocks in the API Group II to III+ range, with viscosity grades as low as 2 and as high as 25 cSt at 100°C.

Continued advancement  

Through on-going R&D, we continue to boost yield, improve tolerance to heteroatom contaminants and broaden the range of acceptable feedstock. The MSDW system is in its third generation, offering better activity, selectivity and polar tolerance.

Featured resources

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  • ExxonMobil Chemical Library icon

    Lube dewaxing – MWI™ catalyst – fact sheet

    Find out how refiners can use MWI™ wax isomerization technology to convert slack wax or other highly paraffinic streams into very high value Group III+ base stocks.

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  • ExxonMobil Chemical Library icon

    Lube base stock hydrofinishing – MAXSAT™ catalyst – fact sheet

    Learn how MAXSAT™ proprietary, state-of-the-art aromatic saturation catalyst can be used with lubes or fuels hydrocrackers or as a hydrofinishing step with hydrodewaxing technologies.

    Read more
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    A Particle of Difference

    How ExxonMobil Catalysts and Technology Licensing solves shared challenges through expertise, specialty catalysts, technology licensing and collaboration.

    Watch the video
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    ExxonMobil Catalysts and Technology Licensing – summary of technologies offered

    Learn about the cutting-edge, proprietary catalysts and advantaged process technologies that ExxonMobil provides for refining, gas and chemical needs.

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