"Ultrasound and high-shear mixing-assisted oxidative desulfurization of" by Peniel Jean Alvarado Gildo

Ultrasound and high-shear mixing-assisted oxidative desulfurization of fuel oils over activated carbon-supported phosphotungstic acid

Date of Publication

12-2016

Document Type

Master's Thesis

Degree Name

Master of Science in Chemical Engineering

Subject Categories

Chemical Engineering

College

Gokongwei College of Engineering

Department/Unit

Chemical Engineering

Thesis Adviser

Nathaniel P. Dugos
Susan A. Roces, co-adviser

Defense Panel Chair

Michael Angelo B. Promentilla

Defense Panel Member

Kathleen B. Aviso
Raymond Girard R. Tan

Abstract/Summary

Sulfur content of the prominent crude oil is continually increasing. Sulfur in fuel contributes in the production of sulfur oxides and sulfate particulate matters which has serious effects in the environment and in health. A new method to either assist or replace the existing technology in sulfur removal is gaining significant attention in the research field – Ultrasound Assisted Oxidative Desulfurization (UAOD) and High-Shear Mixing Assisted Oxidative Desulfurization (MOAD) because of its advantages such as the mild operating conditions, non-usage of the expensive hydrogen gas, and better oxidation of the refractory organic sulfur compounds. In this study, it was found that the utilization of ultrasound and high-shear mixing as assistance to oxidative desulfurization was successful and the reactivities of the three compounds are as follows: DBT > BT > T, owing to their electron densities. The most suitable loading of phosphotungstic acid (HPW) on activated carbon (AC) was 10%. The UAOD applied to model fuel was optimized at 9.88 M, 281.56 mg of catalyst, 145.49 mg of PTA, 26.6 mL to 13.4 mL of OP:AP ratio and 18.36 minutes of ultrasonication rendering an oxidation of more than 99% of the 500 ppm sulfur in the form of dibenzothiophene. UAOD and MAOD was applied to simulated fuel – 2800 ppm sulfur in the form of the three sulfur compounds. The UAOD applied to simulated fuel is optimized at 25.52wt% of H2O2, 983.9 mg of catalyst dose, 9.52 mL of AP per 10 mL of OP and 76.6 minutes of ultrasonication rendering a percent oxidation of 94.74%. MAOD applied to simulated fuel is optimized at high levels of parameters: 50°C reaction temperature, and 90 minutes of reaction time rendering 97.52% oxidation. After applying to an actual fuel – kerosene, the desulfurization efficiencies were more than 98%. The basic properties of the fuel produced after desulfurization is near its original value and thus, the desulfurized fuels are viable for use.

Abstract Format

html

Note

Both Bachelor and Master's degree

Language

English

Format

Electronic

Accession Number

CDTG006880

Shelf Location

Archives, The Learning Common's, 12F Henry Sy Sr. Hall

Physical Description

1 computer optical disc; 4 3/4 in.

Keywords

Petroleum—Refining—Desulfurization

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Embargo Period

10-17-2024

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