The plant is designed for processing the purified product of the Fischer-Tropsch reactor and separating paraffinic hydrocarbons into fractions to obtain LPG products, naphtha, kerosene and diesel fuel.
Fischer-Tropsch paraffin, distillation column bottoms and a mixture of hydrogen make-up and hydrogen rich circulation gas are sent to a paraffin hydrocracking reactor where long hydrocarbon chains are cracked and isomerized. The cracked paraffin and hydrocarbon condensate are sent to a hydrotreating reactor to convert all non-paraffin components to saturated hydrocarbons in a hydrogen rich environment. The reactor products are then cooled, separated and the unreacted hydrogen is returned back to the hydrocracker. Liquid products are fractionated into GTL diesel, GTL kerosene and GTL naphtha, then cooled in water coolers and sent to finished product storage tanks. Unreacted oil is sent back to the hydrocracker. The GTL diesel fuel can be further treated in an isodeparaffinization reactor to achieve the required flow characteristics of the diesel product at low temperatures. The GTL naphtha is stabilized in a separate column.