APPLICATION OF ULTRAFILTRATION AND NANOFILTRATION PROCESSES IN PETROLEUM INDUSTRY

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2022-2-11

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Dizvay, Isin

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Membrane separations become prominent as green techology is taking over. Besides many traditional separation processes being replaced with membrane applications, many potentials are discovered to be transformed. Petrochemical industry is one of the fields with many potentials. This study includes two different membrane applications on different processes in petrochemical industry. Vast amount of produced water from oil fields requires a number of separation processes to be disposed properly or to be reused. As an economic and environmental alternative, membrane separations have been used for a while. Yet, membrane replacement is inevitable due to the fouling. The first part of this study focuses on anti fouling strategies on polyethersulfone (PES) hollow fiber membranes during oil-water emulsion (OWE) filtrations. OWE was filtered on hollow fiber membranes in a cross-flow system at pressures starting from 0,3 bar, at 0,2 bar increments until limiting flux is reached.The effect of hollow fiber geometry, cross-flow velocity, emulsion type and membrane material on fouling were observed. Spiral fiber geometry has a superiority over standart tubular geometry with respect to fouling. Also, cross-flow velocity was found to be reversely related to fouling. More hydrophilic cellulose acetate (CA) membrane fouled less and more reversibly than PES membrane. Emulsion oil droplet size distrubution and oil-surfactant constituents in the emulsions also affected the fouling reversibility. The second part of the studyis on ethylene glycol recovery from a petrochemical stream. Recovery and recycle of organic compounds are necessary in industry due to economic and environmental reasons. Ethylene glycol (EG) is a commercial product as a part of the ethylene oxide production process. A stream containing EG and NaHCO3 was treated to separate NaHCO3 from EG. In order to do this, 3 commercial nanofiltration (NF) membrane (Desal DK, DL, HL) performances were observed in a cross-flow system. It was found that a stream containing 2,2 % NaHCO3 and 2,5 % EG can be desalinated to 0,22 % NaHCO3 and 2,5 % EG with a two stage process using Desal DK membrane.

Subject Keywords

Oil-Water Emulsion, Antifouling, Hydrodynamics, Ethylene Glycol, NaHCO3

URI

https://hdl.handle.net/11511/96707

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

I. Dizvay, “APPLICATION OF ULTRAFILTRATION AND NANOFILTRATION PROCESSES IN PETROLEUM INDUSTRY,” M.S. - Master of Science, Middle East Technical University, 2022.