cumene alkylation

Heavy aromatics transalkylation (TransPlus℠ 5)  

Learn about Transplus℠ 5 heavy aromatics transalkylation technology, available for license from ExxonMobil.

The TransPlus℠ 5 process is the low-cost, high-conversion solution to upgrade C₉+ heavy aromatics and toluene to higher-value mixed xylenes and high purity benzene products. Benzene can also be co-processed for additional mixed xylenes production. The TransPlus 5 process, which is based on a proprietary high-activity, co-extruded dual zeolite catalyst with low precious metal content, offers superior yields, longer cycles, lower operating costs and increased profitability. The TransPlus 5 process is also licensed by Axens as part of the ParamaX® technology suite for grassroots aromatics complexes.

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Key benefits

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    Broad feedstock

    • Up to 100 C9+ A in fresh feed
    • No indane spec in the C9+ A fraction
    • Unlimited C10A’s in the C9+ A fraction
    • Low H2:HC ratio

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    Improved process performance

    • Higher xylenes yields
    • Improved benzene purity
    • Very low ring loss
    • Substantially higher de-ethylation

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    Lower process costs

    • Smaller unit – grassroots
    • Higher capacity – revamps
    • Longer catalyst cycles

TransPlus 5 flowscheme  

The following simplified flowscheme shows the TransPlus 5 process in a typical fractionation and recovery section of an aromatics complex.

transplus 5 flowscheme

Higher xylenes yields, longer cycles, very low ring loss and improved benzene purity  

The TransPlus 5 process delivers improved products yields, very low ring loss, improved benzene purity and significantly extended cycles. While cycles of 7+ years have been achieved with the first generation catalysts, significantly longer cycles are anticipated with the TransPlus 5 process. Multiple in-situ regenerations of previous generation catalysts have been commercially demonstrated. Likewise, the catalyst used in the TransPlus 5 process is fully regenerable in-situ, allowing continued operation for many years beyond the first cycle. The TransPlus 5 process delivers substantial improvements over its predecessors such as higher C₉+ aromatics conversion per pass, higher selectivity to xylenes and benzene products, lower aromatics ring loss, longer cycles and reduced installed costs. The TransPlus 5 process operates at higher C₉+ aromatics conversion per pass, meaning reduced recycle rates and reduced operating costs versus prior generations.

Enhanced features of our third generation technology  

The TransPlus 5 process is the third generation of transalkylation technology licensed by ExxonMobil. The process features a high-activity, co-extruded dual zeolite catalyst formulation with low precious metal content, higher operating weight hourly space velocity (WHSV), and an expanded temperature window compared to the prior generation technology.

TransPlus 5 process: Broad feedstock flexibility  

The TransPlus 5 process is capable of handling light to very heavy fresh feeds of compositions, from very light feeds up to up to and including 100% C₉+ aromatics in the fresh feed. In addition, the TransPlus 5 process can process C₉+ heavy aromatics with either toluene, benzene or any combination of the two as co-feeds. This broad feedstock flexibility provides Licensees with exceptional operating flexibility and profit-maximizing potential. For example, Licensees have increased flexibility to optimize the disposition of the C₉+ aromatics stream by enabling incremental production of mixed xylenes and reducing the heavy aromatics content in gasoline in order to meet reformulated fuel requirements or distillation specifications. Licensees can also upgrade benzene product to mixed xylenes when it is economically attractive.

TransPlus 5 process: Broad feedstock flexibility  

transplus process

Life cycle support  

  • Initial discussions to confirm client objectives and tailor the solution
  • Detailed yield estimate
  • Feasibility study
  • Commercial proposal
  • Process design package
  • Technology transfer, training, catalyst loading and startup support
  • Technology improvement
  • Performance monitoring and technical assistance throughout the life of the catalyst

Featured resources

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  • ExxonMobil Chemical play button icon

    Introduction to ExxonMobil Catalysts and Technology Licensing

    See an overview of ExxonMobil's refining, chemical manufacturing and gas processing technologies along with their assortment of specialty catalysts. These technologies and catalysts are used at ExxonMobil's own facilities and are offered for license to customers.

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