IMPROVING GASOLINE QUALITY BY REDUCING THE FCC GASOLINE SULPHUR CONTENT

Sažetak Benzin dobiven procesom fluid katalitičkog krekinga jedan je od najvećih izvora sumpora u proizvodnji motornih benzina Rafinerije nafte Rijeka. Trenutačno primjenjivi standardi dopuštaju maksimalni sadržaj sumpora od 150 ppm, dok će u 2005. godini biti primjenjiv standard s dopuštenih maksimalnih 50 ppm sumpora u motornim benzinima. Budući da se izgradnja postrojenja koje rješava problem sumpora u rafineriji ne očekuje prije 2006. grupa stručnjaka Rafinerije nafte Rijeka predložila je prijelazno rješenje korištenjem postojećih postrojenja rafinerije u svrhu frakcionacije i uklanjanja sumpora u FCC benzinu. U tu svrhu postavljeni su matematički modeli sekcije postrojenja atmosferske destilacije, te postrojenja Unifining i HDS. Istraživani su i proučeni optimalni radni uvjeti procesa simuliranjem, te je predloženo optimalno rješenje s obzirom na raspoloživu procesnu opremu, zahtijevane kapacitete, zahtijevano smanjenje količine sumpora uz kriterij minimalnog gubitka oktanskog broja benzina kao i raspoložive količine energenata.Abstract Gasoline obtained through the process of fluid catalytic cracking is one among the largest sources of sulphur in gasoline production of the Rijeka OIl Refinery. Currently applicable standards allow for maximum sulphur content of 150 ppm, whereas the standard applicable as of 2005 will allow for the maximum of 50 ppm of gasoline sulphur content. Since the construction of units resolving the problem of sulphur is at the refinery not expected before 2006, a group of the refinery’s experts has suggested a transitory solution through the use of the existing units for fractionation and desulphurization of FCC gasoline. To this end, mathematical simulation models of the atmospheric distillation, unifining and HDS units have been set up. Researched and studied through simulation were the optimal operating conditions of the process, after which an optimal solution was suggested given the available process equipment, required capacities and required sulphur content reduction, as well as given the criteron of minimal loss of the gasoline octane number and the available volume of energents

IMPROVING GASOLINE QUALITY BY REDUCING THE FCC GASOLINE SULPHUR CONTENT

Sažetak Benzin dobiven procesom fluid katalitičkog krekinga jedan je od najvećih izvora sumpora u proizvodnji motornih benzina Rafinerije nafte Rijeka. Trenutačno primjenjivi standardi dopuštaju maksimalni sadržaj sumpora od 150 ppm, dok će u 2005. godini biti primjenjiv standard s dopuštenih maksimalnih 50 ppm sumpora u motornim benzinima. Budući da se izgradnja postrojenja koje rješava problem sumpora u rafineriji ne očekuje prije 2006. grupa stručnjaka Rafinerije nafte Rijeka predložila je prijelazno rješenje korištenjem postojećih postrojenja rafinerije u svrhu frakcionacije i uklanjanja sumpora u FCC benzinu. U tu svrhu postavljeni su matematički modeli sekcije postrojenja atmosferske destilacije, te postrojenja Unifining i HDS. Istraživani su i proučeni optimalni radni uvjeti procesa simuliranjem, te je predloženo optimalno rješenje s obzirom na raspoloživu procesnu opremu, zahtijevane kapacitete, zahtijevano smanjenje količine sumpora uz kriterij minimalnog gubitka oktanskog broja benzina kao i raspoložive količine energenata.Abstract Gasoline obtained through the process of fluid catalytic cracking is one among the largest sources of sulphur in gasoline production of the Rijeka OIl Refinery. Currently applicable standards allow for maximum sulphur content of 150 ppm, whereas the standard applicable as of 2005 will allow for the maximum of 50 ppm of gasoline sulphur content. Since the construction of units resolving the problem of sulphur is at the refinery not expected before 2006, a group of the refinery’s experts has suggested a transitory solution through the use of the existing units for fractionation and desulphurization of FCC gasoline. To this end, mathematical simulation models of the atmospheric distillation, unifining and HDS units have been set up. Researched and studied through simulation were the optimal operating conditions of the process, after which an optimal solution was suggested given the available process equipment, required capacities and required sulphur content reduction, as well as given the criteron of minimal loss of the gasoline octane number and the available volume of energents