Residue Oil Desulfurization Using Oxidation and Extraction Method

Abstract

This study successfully improved the performance of oxidative desulfurization method to reduce sulfur content from residue oil (condensate) with modifications of oxidation and extraction steps which was repeated for several stages. Residue oil used in this study contain 386.2 ppm of initial sulfur content. In oxidation process, H2O2 as oxidizer and acid as catalyst were used within temperature range of 30–60 °C and time interval from 30 to 120 min. In extraction process, various alcohol solvents (methanol, ethanol, and propanol) were used with the temperature of 30 °C in 30 min for every residue oil ratio to solvent (v/v). The best reducing sulfur result achieved was 35.9 ppm or 90.7% desulfurization. This result was achieved after 4 recursively extractions using ethanol as solvent. This study successfully reduced sulfur content in residue oil to meet the international standard (< 50 ppm).

Oxidative Desulfurization of Heavy Oils with High Sulfur Content: A Review

“…Mohammed et al [31] performed oxidation of crude oil containing 1.494 wt.%S at 90 • C. After 15 min of reaction using a mixture of acetic acid and hydrogen peroxide with a oxidant/catalyst volume ratio of 1 and a catalyst/sulfur mass ratio of 8, followed by solvent extraction using n-heptane, the total sulfur content was reduced to 0.318 wt.%S. Several publications (Farshi & Shiralizadeh, 2015;Tetrisyanda et al, 2017;Toteva et al, 2009) [13,26,30] focused on the effect of temperature on ODS reaction. In most studies, increasing temperature from 35 • C to 90 • C enhanced sulfur reduction but above 90 • C, the increase in temperature had a reverse effect mainly due to the degradation of oxidant used and the formation of resins and asphaltenes [13].…”

“…The effect of this ratio was extensively studied [13,23,26,30,32]. In many cases, oxidation reaction of petroleum mixture was performed using a molar ratio of oxidant:sulfur of 2.…”

Key Factors Affecting the Development of Oxidative Desulfurization of Liquid Fuels: A Critical Review

“…Some ILs can act as both extractant and catalyst such as [Omim]­[HSO 4 ], [BPy]­[BF 4 ], and [EimC 4 SO 3 H]­NTf 2 . Some ILs can be applied as only catalysts such as [Cn­(mim) 2 ]­Cl 2 /mFeCl 3 , [EMIM]­[NiCl 2 ], [EMIM]­[CoCl 2 ], [EMIM]­[MnCl 2 ], [PW 12 O 40 ], − …”

“…Tetrisyanda et al 93 desulfurized residue oil using H 2 O 2 in the presence of formic or acetic acid as catalysts. They found that peracetic acid is more reactive and has high oxidizing ability compared to performic acid.…”