Crude oil is processed through a single-stage atmospheric pipe-still producing an overhead naptha cut, kerosene and gas oil sidestream cuts and bottoms at 350°C. Variation of sidestream cut points produces kerosene or aviation fuel and auto diesel or marine diesel in blocked operations. The naphta cut is de-ethanised, de-butanised and split with light and heavy virgin naphthas to blend motor gasonline, while heavy virgin naptha is also blended to middle distillates and heavy fuel oil (HFO). Light end fractionalisation splits into propane and butane, liquified petroleum gases, (LPG) and butane for gasoline blending. The kerosene sidestream is hydrofined and run down to tankage as dual purpose kero/turbo fuel. Auto diesel oil is produced by blending a part, or all of the kerosene sidestream. However, as a heavier cut it may also be run down directly to tankage as marine diesel oil. Atmospheric Pipestill bottom is blended with gas oil, kero and/or heavy virgin naptha to produce Bunker C fuel oil. The vacuum Pipestill produces two grades of penetration asphalt.
প্রকৌশলী মোঃ লোকমান