DTL™ process technology
Innovative DTL™ technology allows refiners to convert light olefins in the fuel gas to stable high-octane gasoline.
DTL Technology process flow diagram










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DTL™ technology features

DTL™ process technology converts light olefins, present in Fluidized Catalytic Cracking (FCC) off-gas, coker off-gas and other refinery light olefinic gas streams into high-octane gasoline blend stock, significantly increasing their value.

The feed stream for the DTL process comes from:

  • Unsaturated fuel gas leaving the FCC gas plant and other unsaturated gases currently burned as fuel gas
  • Excess ethylene, butylene and unrecovered propylene present in fuel gas in propylene producing FCC units

Once unsaturated fuel gas is diverted to the DTL process, the stream is converted to high octane gasoline blend stock. The stock can be blended into the gasoline pool for increased gasoline production.

DTL technology also provides a benefit to Propylene producing FCC units as it recovers gasoline yield loss to ethylene and butylene for producing propylene back to high octane gasoline. This technology also provides flexibility to refiners to produce more propylene from the FCC unit without worrying about excess fuel gas production.

Today, 12 refineries are using DTL technology to optimize their gasoline production.




DTL™ technology process

The chemical reactions of DTL process technology are exothermic, which provides energy integration opportunity to lower utility cost, while the compact footprint, low operating pressure and reduced number of unit operations minimizes CAPEX.

This low CAPEX process can be integrated downstream of FCC gas plant. It uses standard refinery equipment such as fixed-bed reactors, absorption column and heterogeneous catalyst.

  • The feed stream, comprising a mixture of hydrogen, methane, ethane, and low concentration, ethylene, propylene and butylene, is diverted to the DTL process.
  • The dry gas is pre-heated with the reactor effluent in a feed-effluent exchanger and then is further heated to the reaction temperature with a fired or electrical heater.
  • The proprietary dry catalyst in the reactor oligomerizes, isomerizes and aromatizes light olefins in the feed. The exothermic reaction will require lean olefinic fuel gas injection by taking a slip stream from the lean olefinic fuel gas leaving the unit or cooling water injection between reactor beds for interbed cooling.
  • The reactor effluent is cooled further in a product condenser and sent to a product recovery column to separate C4+ material from the reactor effluent. The C4+ is then sent to a Stabilizer column to produce high octane gasoline blend stock.

This technology produces high olefin conversion (>95%) with 75 wt% C5+ liquid yield containing low benzene content and an additional 10 wt% C4 yield which can also be blended to gasoline pool. The gasoline octane from this process is premium grade.




INVISTA Performance Technology (IPT) and

Koch-Glitsch and INVISTA Performance Technology (IPT), affiliates of Koch Industries, have announced a partnership to offer the innovative DTL process technology to refiners.

The partnership combines IPT’s licensing and technology transfer capabilities with Koch-Glitsch’s market knowledge and refinery technology expertise. The capabilities of the extended Koch Engineered Solutions (who have successfully executed projects greater than $500 million value on a turnkey basis) allows us to offer full-service project execution.

More information
More information about DTL technology from IPT is available on IPT's DTL technology site

To implement the DTL technology in your facilities, please email KGProcessTechnology@kochglitsch.com