Feasibility study about adding DSO to Hydrocarbon Condensate

摘要

This work presents a feasibility study about the injection of the DSO-a side product in LPG treatment units - to Hydrocarbon condensate- product of stabilizing units- in South Pars Gas Complex phases 4, 5 plants. 5.2 ton/day DSO (Disulfide Oil) is produced in LPG a unit which uses caustic for removing mercaptane from LPG and as a waste side product; it is burned in burn pit. The Hydrocarbon condensate is separated from the plant feed by the rate of 80000 bbls/day and stored as a product after RVP adjustment. A PVTsim and HYSYS simulation followed by a sort of lab experiments and the following results are achieved. The total sulfur and mercaptane content of Hydrocarbon condensate are 2830 ppmw and 2300 ppmw respectively which this injection increase the total sulfur up to 3380 ppmw. This amount meets the Hydrocarbon client's standards. The lab experiments are shown a decrement in Hydrocarbon condensate density. Concluding from simulations' results the DSO, Hydrocarbon mixture in operating pressures (1 to 50 barg) formed wax at -41 to -37 degree centigrade so in the positive operating temperature of the plant, there is no risk of wax formation. Low amount of caustic which exist in DSO, should be separated before injection. Injecting DSO to hydrocarbon condensate increases the DSO selling price and in the other hand decreases the environmental pollution of DSO burning.