Desulfurization of FCC Gasoline by Solvent Extraction and Photooxidation

Abstract

A deep desulfurization process for FCC light gasoline has been investigated. The process is comprised of liquid-liquid extraction with acetonitrile, and photooxidation with ultraviolet light from a high-pressure mercury lamp. After the extraction the sulfurcontaining compounds transfer from the oil to the solvent and then the solvent containing these sulfur compounds was photoirradiated with ultraviolet light from a high pressure mercury lamp 300 W and with 200-300 nm, using strengthen electronic stirrer during the irradiation .The oil from the solvent was recovered with water. An azeotropic mixture (containing 86% acetonitrile and 14% water) was recovered successfully with one distillation column, and can reuse. The total sulfur content in this gasoline decreased from 309 to 68 ppm following 8 h of photo-irradiation .The total yield of the oil vary between 90-96%. The main sulfur compounds of this gasoline are alkyl substituted thiophenes.

Conventional and Upcoming Sulfur‐Cleaning Technologies for Petroleum Fuel: A Review

“…[42] Ther esults indicated the following desulfurization trend:D BT < 4-MDBT < 4,6-DMDBT,w hich is oppositet ot hat observed in the commercial HDS process.O ne more advantagei st hat no organic solventw as needed to clean up the oxidized byproducts. [52][53][54][55] In alengthy OD procedure,H 2 O 2 combined with UV irradiation (4-phenylbenzophenone was added to improve photooxidation) was employed to remove DBT from 2000 mg kg À1 light fuel with 98 %e fficiency. [43]…”

Photochemical and Electrochemical Oxygenation of Thiophenes, Benzo[b]Thiophenes and Dibenzothiophenes; Photochemical and Electrochemical Behaviour of Their Oxygenated Intermediates and Products

“…11 Thiophene itself has been noted to photooxidise with O 2 under UV-irradiation in the presence of Na-ZSM-5 zeolite as a catalyst, although the reaction product has not been characterised. 24 Direct photolytic oxidation of 2,5dimethylthiophene in presence of titanium-pillared montmorillonite has also been found to be viable. 24 Direct photolytic oxidation of 2,5dimethylthiophene in presence of titanium-pillared montmorillonite has also been found to be viable.…”

“…23 Photooxidation of dialkylated thiophenes, as major sulfur-containing components in FCC light gasoline (light gasoline derived from fluid catalytic cracking), with concomitant liquid-liquid extraction of the products with acetonitrile has been used in a 'deep desulfurisation process', typically decreasing the sulfur content of the FCC light gasoline from 309 ppm to 68 ppm. 24 Direct photolytic oxidation of 2,5dimethylthiophene in presence of titanium-pillared montmorillonite has also been found to be viable. Again, the reaction was used in combination with a liquid-liquid oil-acetonitrile extraction process, which proved to be successful in removing 97.4% of the sulfur-containing components from the oil.…”

Model of Fluidized Catalytically Cracked (FCC) Gasoline Photochemical Desulfurization Reactor

“…For these reasons, fluidized catalytically cracked (FCC) gasoline and diesel oil has been desulfurized via the utilization of photochemistry processes, and fine results were obtained at the laboratory at the East China University of Science and Technology (ECUST). , By utilizing a semiconducting light catalyzer, the desulfurizing result was better improved and the residence time was shortened. Currently, most researchers have been focused on studying the light catalyzer and its mechanism and reaction process; however, it is not reported that the mathematical model of the photochemical desulfurization reactor has been applied to petroleum processing techniques.…”