Technology Description

The DTL™ process is a dry-gas-to-liquids technology that allows for flexible conversion of light olefins, present in FCC offgas, into either gasoline and distillate or concentrated aromatics, significantly increasing their value.  The DTL™ process technology increases existing refinery naphtha and aromatics production through the conversion of dilute, light olefins, present in refinery FCC offgas.  The DTL™ Process technology is focused on high conversion of ethylene and propylene, at low pressure conditions, without significant feed separation, to enable a cost-effective gas-to-liquids process solution to the refiner.

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Using multifunctional polymerization, dehydrogenation, and aromatization catalysts, these hard-to-recover light olefins gases are converted into valuable liquids while the incremental site energy needs are supplanted through the use of cost-effective natural gas.

Sweetened FCC dry-gas, comprising a mixture of hydrogen, methane, ethane and low concentration ethylene, propylene and C4s, is pre-treated, efficiently heated and reacted at high conversion, using proprietary multifunctional catalysts, to oligomerize and aromatize the contained mixed olefins.  The product effluent is cooled to recover liquid polygas and a remaining fuel gas vapor.  Natural gas is used to replace the heating value of the olefins converted.  Polygas product is stabilized and either blended into the gasoline pool when designed for maximum octane-barrel production (94 RON) or sent to an aromatics extraction unit (60+% BTX) when designed for maximum aromatics production.  Typical process scale and design allows for unit modularization to help reduce time of construction.

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INVISTA offers a comprehensive technology transfer package and proprietary catalyst for the DTL™ process technology.

Key Features

The DTL™ process technology offers the following advantages:

  • Simplified, fixed-bed design and process control
  • Low operating pressures
  • Customer-focused design to enable maximum octane-barrel production or maximum aromatics yield
  • Robust feed pre-treatment and catalyst solutions for handling a broad range of mixed olefin conversions and feed impurities