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Processing Units of Oil Refinery
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Modular Refinery
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Processing Units of Oil Refinery


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  • Crude Oil Distillation Unit

    Crude Oil Distillation Unit

    Crude Oil Distillation Unit (CDU): is the first processing unit in virtually all oil refineries. The CDU distills the incoming crude oil into various fractions of different boiling ranges, each of whi...
  • Vacuum Distillation Unit

    Vacuum Distillation Unit

    Vacuum Distillation Unit (VDU): further distills the residue oil from the bottom of the crude oil distillation unit. The vacuum distillation is performed at a pressure well below atmospheric pressure.
  • Diesel Hydrotreating Unit

    Diesel Hydrotreating Unit

    Diesel Hydrotreating Unit (DHT): uses hydrogen to desulfurize the naphtha fraction from the crude oil distillation or other units within the refinery.
  • Semi-regenerative Reforming

    Semi-regenerative Reforming

    Semi-regenerative Reforming (SRR): used to convert petroleum refinery naphtha distilled from crude oil (typically having low octane ratings) into high-octane liquid products called reformates, which a...
  • Fluid Catalytic Cracking Unit

    Fluid Catalytic Cracking Unit

    Fluid Catalytic Cracking Unit (FCC): under the action of heat and catalyst, upgrades the heavier, higher-boiling fractions from the crude oil distillation by converting them into lighter and lower boi...
  • Sulfur Recovery Unit

    Sulfur Recovery Unit

    Sulfur Recovery Unit (SRU): converts sulfur gas such as H2S into elemental sulfur, so as to convert waste into treasure and protect the environment.
  • Isomerization Unit

    Isomerization Unit

    Isomerization Unit: converts linear molecules such as normal pentane into higher-octane branched molecules for blending into the end-product gasoline. Also used to convert linear normal butane into is...
Oil refining processes are the chemical engineering processes and other facilities used in petroleum refineries (also referred to as oil refineries) to transform crude oil into useful products such as liquefied petroleum gas (LPG), gasoline or petrol, kerosene, jet fuel, diesel oil and fuel oils. As a core part of the crude oil refinery process, these operations rely on specialized oil refinery equipment to ensure stable and efficient output.

PCC's oil refinery usually consists of processing units like CDU, VDU, NHT, DHT, SRR, FCC, SRU, and Isomerization units, forming a complete refinery plant process within a modern crude oil processing plant.