Recovery of heavy hydrocarbons or LPG from refinery gas streams can significantly increase the added value of their products and enhance their profitability and overall competitiveness.

State of the art processing technology and equipment are essential for efficient and reliable operation.  Maximizing LPG recovery into the product streams improves  refining margins.

Light ends recovery process

The light ends recovery unit uses absorption and distillation steps to remove propane and heavier components from refinery gas streams prior to their use as fuel gas.  The recovered C3+ components are then separated and used in various product streams.  

In the absorption step, naphtha and kerosene are used to absorb the  heavier hydrocarbons producing fuel gas and the heavier liquid stream. The naphtha rich liquid product exiting the bottom of the absorber is fed into a series of columns which removes lighter products stage by stage. 

These sub-columns are named in a self-explanatory way

  • Deethanizer:  Ethane recovery
  • Depropanizer:  Propane recovery
  • Debutanizer:  Butanes recovery
  • Deisobutanizer:  Separates the isobutane overhead and normal butane as a side draw

The remaining C5/C6 fraction is generally used for gasoline blending, while the heavy naphtha fraction goes to the catalytic reforming to produce high octane gasoline.

One or more of these light ends columns can become a bottleneck in refinery expansion, reconfiguration or feedstock change.  However, these can be alleviated with modern upgraded internals and/or rerated rotating equipment.

Light ends recovery process

Pumping solutions
  • OHH overhung single stage pumps
    The OHH is our API 610 (ISO 13709) type OH2 overhung, horizontal, centerline mounted, single stage, radially split process pump.

  • OHHL low flow high head pumps
    The OHHL is our API 610 (ISO 13709) type OH2 low-flow horizontal overhung process pump. It covers the low-flow end of the OHH range map.

  • PRE end suction pump range
    The PRE is our API 610 (ISO 13709) Type OH2 overhung, horizontal, centerline mounted, single stage, radially split process pump. The highly configurable design offers reliability, high efficiency and minimum pump life cycle cost.
Separation technology
  • Sulzer Plus tray technology
    Our high performance trays, VGPlus™ and UFMPlus™ combine high capacity tray decks and advanced chordal downcomer technology for high column loads.

  • Shell tray technology
    The exclusive alliance with Shell Global Solutions enables us to offer the complete range of Shell tray technology with multi-downcomer principle for high liquid loads to you.

  • Floating valve trays
    Floating valve trays are used in applications where higher turndown ratios are required. We can provide trays with round valves or our proprietary BDH™ and UFM™ valves.
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