DEVELOPMENT OF A BASIC TECHNOLOGICAL SCHEME FOR THE PROCESS OF ADSORPTION DESULPHURIZATION OF GASOLINE FRACTION USING SILICA GEL MODIFIED WITH ZINC(II) PIVALATE

The paper presents the results of a theoretical and experimental study of the effectiveness of adsorption desulfurization of hydrocarbon motor fuels using silica gel modified with zinc(II) pivalate. The expediency of using powdered silica gel in the process of removing toxic and highly corrosive hydrogen sulfide and thiols are shown. Based on the effective parameters of adsorptive desulphurization established in laboratory conditions, a schematic process flow diagram for the process of removing acidic sulfur compounds from the gasoline fraction at a temperature of 25 ℃ and a pressure close to atmospheric are proposed. The possibility of solvent regeneration of the saturated adsorbent of the desulfurization process at a temperature of 25 ℃ and a pressure close to atmospheric are shown. The most effective solvent for the regeneration process is isopropyl alcohol. To maintain the activity and stability of the adsorbent during the desulphurization process, the technological scheme provides for ultrasonic feeding of the regenerated adsorbent with a saturated solution of the modifier, followed by drying with fuel gas. The recovery of isopropyl alcohol after washing the saturated adsorbent is carried out by distillation at a temperature of 90 ℃ and a pressure close to atmospheric. Technology based on adsorption by a scavenger consisting of a carrier and a polynuclear carboxylate complex of transition metal allows the removal of sulfur-containing compounds directly in the feed stream. A reactor with a suspension adsorbent bed is proposed as the main apparatus for the process of adsorption desulphurization. The process of washing and separating the suspension of adsorbent and fuel takes place in drum vacuum filters. The concentrate of sulfur compounds obtained during the purification process can be used as a feedstock in chemical and petrochemical processes in order to obtain practically important sulfur-containing compounds. For citation: Kamyshnikova A.S., Okhlobystin A.O., Karatun O.N., Storozhenko V.N., Zorina-Tikhonova E.N., Berberova N.T. Development of a basic technological scheme for the process of adsorption desulphurization of gasoline fraction using silica gel modified with zinc(II) pivalate. ChemChemTech [Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.]. 2023. V. 66. N 2. P. 92-99. DOI: 10.6060/ivkkt.20236602.6705.