Thermo-chemical extraction of fuel oil from waste lubricating grease

T.J. Pilusa, E. Muzenda, M. Shukla

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

This study investigated the recovery of oil from waste grease through the process of thermal degradation in an aqueous solution of potassium hydroxide (KOH) followed by solvent extraction. Waste high temperature metal bearing grease was dissolved in a 15w/w% KOH solution at 80°C while being agitated at 2000rpm using a shear action agitator for a period of 15min. Two distinct layers were observed after 8min of settling time. The top layer being of dark brown oil and the bottom layer was a heterogeneous mixture. The two layers were separated by decantation. The bottom layer was cooled down to 45°C followed by slow addition of toluene (C7H8) while agitating at 1200rpm for 15min to prevent solids settling and minimise rapid volatilisation of the organic compounds in the mixture. Two distinct layers were also formed, the top homogeneous mixture of light brown oil-toluene mixture and the bottom sludge layer. The solvent was recovered from the oil for re-use by fractional distillation of the homogenous mixture. It was observed that 15w/w% potassium hydroxide solution can chemically degrade the soap matrix in the grease and extract up to 49w/w% of the fuel oil when subjected to high shear stress at a temperature of 80°C. The 26w/w% extraction of oil in the remaining sludge was obtained by solvent extraction process with mass ratios of sludge to solvent of 2:1. Solvent recovery of 88% by mass was obtained via fractional distillation method. The combined extraction processes brought an overall oil yield of 75w/w% from the waste grease. The fuel oil obtained from this process has similar properties to paraffin oil and can be blended with other oils as an alternative energy source. © 2013 Elsevier Ltd.
Original languageUndefined/Unknown
Pages (from-to)1509-1515
Number of pages7
JournalWaste Management
Volume33
Issue number6
DOIs
Publication statusPublished - 2013

Bibliographical note

cited By 5

Keywords

  • Alternative energy source
  • Extraction process
  • Fractional distillation
  • Heterogeneous mixtures
  • Homogeneous mixtures
  • Homogenous mixtures
  • Potassium hydroxide solution
  • Solvent-extraction process, Fuel oils
  • Fueling
  • Mixtures
  • Paraffin oils
  • Potassium hydroxide
  • Solvent extraction
  • Thermochemistry
  • Toluene, Lubricating greases, fuel oil
  • liquid paraffin
  • lubricating agent
  • organic compound
  • potassium carbonate
  • potassium hydroxide
  • toluene, aqueous solution
  • distillation
  • extraction method
  • flocculation
  • high temperature
  • hydroxide
  • solvent
  • toluene
  • waste management, aqueous solution
  • article
  • cost
  • heat treatment
  • priority journal
  • shear stress
  • sludge
  • solvent extraction
  • volatilization
  • waste minimization, Chemical Fractionation
  • Distillation
  • Fuel Oils
  • Hot Temperature
  • Hydroxides
  • Lubricants
  • Oils
  • Paraffin
  • Potassium Compounds
  • Sewage
  • Solvents

Cite this

Pilusa, T.J. ; Muzenda, E. ; Shukla, M. / Thermo-chemical extraction of fuel oil from waste lubricating grease. In: Waste Management. 2013 ; Vol. 33, No. 6. pp. 1509-1515.
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Thermo-chemical extraction of fuel oil from waste lubricating grease. / Pilusa, T.J.; Muzenda, E.; Shukla, M.

In: Waste Management, Vol. 33, No. 6, 2013, p. 1509-1515.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Thermo-chemical extraction of fuel oil from waste lubricating grease

AU - Pilusa, T.J.

AU - Muzenda, E.

AU - Shukla, M.

N1 - cited By 5

PY - 2013

Y1 - 2013

N2 - This study investigated the recovery of oil from waste grease through the process of thermal degradation in an aqueous solution of potassium hydroxide (KOH) followed by solvent extraction. Waste high temperature metal bearing grease was dissolved in a 15w/w% KOH solution at 80°C while being agitated at 2000rpm using a shear action agitator for a period of 15min. Two distinct layers were observed after 8min of settling time. The top layer being of dark brown oil and the bottom layer was a heterogeneous mixture. The two layers were separated by decantation. The bottom layer was cooled down to 45°C followed by slow addition of toluene (C7H8) while agitating at 1200rpm for 15min to prevent solids settling and minimise rapid volatilisation of the organic compounds in the mixture. Two distinct layers were also formed, the top homogeneous mixture of light brown oil-toluene mixture and the bottom sludge layer. The solvent was recovered from the oil for re-use by fractional distillation of the homogenous mixture. It was observed that 15w/w% potassium hydroxide solution can chemically degrade the soap matrix in the grease and extract up to 49w/w% of the fuel oil when subjected to high shear stress at a temperature of 80°C. The 26w/w% extraction of oil in the remaining sludge was obtained by solvent extraction process with mass ratios of sludge to solvent of 2:1. Solvent recovery of 88% by mass was obtained via fractional distillation method. The combined extraction processes brought an overall oil yield of 75w/w% from the waste grease. The fuel oil obtained from this process has similar properties to paraffin oil and can be blended with other oils as an alternative energy source. © 2013 Elsevier Ltd.

AB - This study investigated the recovery of oil from waste grease through the process of thermal degradation in an aqueous solution of potassium hydroxide (KOH) followed by solvent extraction. Waste high temperature metal bearing grease was dissolved in a 15w/w% KOH solution at 80°C while being agitated at 2000rpm using a shear action agitator for a period of 15min. Two distinct layers were observed after 8min of settling time. The top layer being of dark brown oil and the bottom layer was a heterogeneous mixture. The two layers were separated by decantation. The bottom layer was cooled down to 45°C followed by slow addition of toluene (C7H8) while agitating at 1200rpm for 15min to prevent solids settling and minimise rapid volatilisation of the organic compounds in the mixture. Two distinct layers were also formed, the top homogeneous mixture of light brown oil-toluene mixture and the bottom sludge layer. The solvent was recovered from the oil for re-use by fractional distillation of the homogenous mixture. It was observed that 15w/w% potassium hydroxide solution can chemically degrade the soap matrix in the grease and extract up to 49w/w% of the fuel oil when subjected to high shear stress at a temperature of 80°C. The 26w/w% extraction of oil in the remaining sludge was obtained by solvent extraction process with mass ratios of sludge to solvent of 2:1. Solvent recovery of 88% by mass was obtained via fractional distillation method. The combined extraction processes brought an overall oil yield of 75w/w% from the waste grease. The fuel oil obtained from this process has similar properties to paraffin oil and can be blended with other oils as an alternative energy source. © 2013 Elsevier Ltd.

KW - Alternative energy source

KW - Extraction process

KW - Fractional distillation

KW - Heterogeneous mixtures

KW - Homogeneous mixtures

KW - Homogenous mixtures

KW - Potassium hydroxide solution

KW - Solvent-extraction process, Fuel oils

KW - Fueling

KW - Mixtures

KW - Paraffin oils

KW - Potassium hydroxide

KW - Solvent extraction

KW - Thermochemistry

KW - Toluene, Lubricating greases, fuel oil

KW - liquid paraffin

KW - lubricating agent

KW - organic compound

KW - potassium carbonate

KW - potassium hydroxide

KW - toluene, aqueous solution

KW - distillation

KW - extraction method

KW - flocculation

KW - high temperature

KW - hydroxide

KW - solvent

KW - toluene

KW - waste management, aqueous solution

KW - article

KW - cost

KW - heat treatment

KW - priority journal

KW - shear stress

KW - sludge

KW - solvent extraction

KW - volatilization

KW - waste minimization, Chemical Fractionation

KW - Distillation

KW - Fuel Oils

KW - Hot Temperature

KW - Hydroxides

KW - Lubricants

KW - Oils

KW - Paraffin

KW - Potassium Compounds

KW - Sewage

KW - Solvents

U2 - 10.1016/j.wasman.2013.02.014

DO - 10.1016/j.wasman.2013.02.014

M3 - Article

VL - 33

SP - 1509

EP - 1515

JO - Waste Management

JF - Waste Management

SN - 0956-053X

IS - 6

ER -