1. De-Mercaptanization Units Removing light mercaptans and converting heavy mercaptans to Disulfides is the goal of De-mercaptanization units. Products with low mercaptane content and converted mercaptans can be handled more easily in comparison to the Gas-Condensate Feed. For Mini- Refineries with low capacity of producing Naphtha and Gas-oil it is recommended to use this method. It decrease the load of desulfurization and increase the life time of downstream fractionation units. Optimizing the cut ranges in fractionation units is very important for controlling the load of De-sulfurization unit. It is not economic to install De-sulfurization facilities for one mini-refinery. But it is economically feasible to install a De-sulfurization facilities to treat the products of 2, 3 or 4 mini-Refineries. Utilizing the DM Units before desulfurization increase the capability of downstream De-sulfurization unit and determine the number of min-refineries that a Desulfurization can make treatment on their products. The main parts of this operation consist of following steps: • Hydrogen Sulfide and Mercaptans C1-C2 Extraction. • Mercaptans C2-C3 Extraction. • Heavy Mercaptans Oxidation 2. De-Sulfurization Units The Goal of Desulfurization Units are to eliminate all Sulfur compounds from Naphtha and Gas-oil. HDS process units in high temperature and pressure decrease the total sulfur below 50 ppm (Gasoline with Euro IV Standard). This process unit is expensive and should be designed for high flow rate of feed to be economically feasible. The main part of this unit consist of following items: • Hydrogen compression unit • Feed pressurizing Unit • HDS Reactor 3. Combination of De-mercaptanization and De-Sulfurization units via optimized Fractionation Combination of these two methods and selecting the optimized cut range in fractionation units are the most important skills of the BEIN AL Qasrain,Kavir Sahar Iranian Co. These practices and skills help to increase the lifetime of catalyst, decrease the rate of catalyst in HDS unit and decrease the Hydrogen consumption of HDS units for a specific capacity of Naphtha and Gasoil in comparison to conventional treatments.