National Refinery Limited

New CUIN Registration number 0001747 NTN-No 0711325-7
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Fuel Refinery

Crude Distillation Unit

In all refineries, crude distillation is the starting point of the refining operations. The Fuel Refinery’s Atmospheric Crude Distillation Unit, therefore, serves the primary purpose of separating the desalted crude oils into its fuel components; Gases, LPG, Naphtha, Kerosene, High Speed Diesel and Furnace Oil for down-stream processing. The overhead product of distillation column is Straight Run Naphtha. This is passed through a stabilizer column to recover LPG. The stabilized Naphtha enters into a splitter column, Light Naphtha is obtained from the top and Heavy Naphtha from the bottom of the splitter column. Light Naphtha is used for Gasoline blending whereas major part of Heavy Naphtha is upgraded at Platforming unit. Naphtha is also exported as feedstock for petrochemical plants.

This Crude Distillation Unit has been revamped for capacity enhancement by about 45% in which a pre-flash unit was added and the heat exchanger scheme was optimized. This way the capacity enhancement was made possible without additional fuel oil consumption.

After the revamp ;the pre-heated crude feed is now pre-flashed in a column to recover maximum of its Naphtha. The pre-flashed crude then follows the conventional flow scheme as narrated above.

Naphtha Hydrobon Unit

This unit is designed to hydrotreat the Heavy Naphtha fraction produced in Crude Distillation Units of the Lube and Fuel refineries. Sulphur and Nitrogen are poisons for reforming catalyst hence removed by Hydro treating Naphtha.

This is a high severity process operated in the presence of a catalyst and hydrogen.

Platforming Unit

The term “Platforming” is applied to catalytic reforming process where chemical conversion of the hydrocarbon feed is achieved on a bed of platinum based catalyst under extreme conditions of pressure and temperature. Hydrotreated Naphtha is the feed to this unit which is converted into high Octane Motor Gasoline.

As part of the Balancing & Modernization Project, the Platforming Unit has also been revamped for capacity enhancement by 72% of design. Adoption of Radial Flow Reactors and new improved catalyst has further enhanced the performance and operating cycle of the unit.

Kero Hydrobon Unit

Essentially similar to the Naphtha hydrotreating process; this unit further refines Sour Kerosene feedstock into the commercial Aviation Turbine Fuel, JP-1 by catalytic hydro treating. The fuel used in the Military Air Crafts JP-4 is also produced at Fuel Refinery by blending JP-1 and Naphtha. Currently not in operation.