Hydrotreating of waste lube oil by rejuvenated spent hydrotreating catalyst

Sadeek, Sadeek A.; Ahmed, Hoda S.; El-Shamy, Ebaa A.; Sayed, Hussien A. El; Rahman, Asma A. Abd El

doi:10.1016/j.ejpe.2014.02.008

Cited by 22 publications

(12 citation statements)

References 14 publications

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“…Oxalic acid treatment improved the equilibrium HDS activity of the catalyst (nearly close to the equilibrium of fresh), the oxidized 4%oxalic acid solution solvent approached the activity of the spent catalyst about 85 % from the fresh catalyst (21) .…”

Section: Hydrodesulphurization Activity Of Spent and Rejuvenated Catamentioning

confidence: 72%

Rerefining of Waste Lube Oil via Solvent Extraction Followed by Catalytic Hydrotreatment

2015

Egypt. J. Chem.

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ITH increased time of usage, lubricating oil loses its lubrication properties and thus must be evacuated and a fresh one replaced. Recovery of waste oil is environment friendly and economic. The waste lube oil was treated by N-methyl-2-pyrrolidone (NMP) + 1% KOH at different conditions as temperatures from 50 to 70 0 C and solvent feed ratio from 1/1 to 7/1. The best conditions which produce good quality raffinate with high yield at 70 0 C and solvent feed ratio 5/1.The fresh catalyst NiMo\Al 2 O 3 that consists of NiO = 5.2 wt.% , MoO 3 = 23 wt.%, Al 2 O 3 balance was applied for re-refining of the best raffinate at different reaction temperatures range from 320 to 410 0 C, hydrogen pressure ranges from 30 to 50 bars and liquid hour space velocity (LHSV) ranges from 0.3 to 0.7 h -1 . The best conditions of hydrotreating to produce the high quality lube oil are (temperature = 350 0 C, pressure = 50 bar and LHSV = 0.5 h -1 ).The catalytic tests carried out using both spent and rejuvenated catalyst (using 4 % oxalic + Fe(NO 3 ) 3 at continuous modes) under the constant temperature, hydrogen pressure and liquid hour space velocity (350 0 C, 50 bar, 0.5 h-1) respectively, in order to compare the hydrodesulphurization (HDS) activity of fresh, rejuvenate and spent catalyst. The result indicated that oxalic acid treatment improved the equilibrium HDS activity of the catalyst (nearly close to the equilibrium of fresh), and also improved the quality of waste lube oil.

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Section: Hydrodesulphurization Activity Of Spent and Rejuvenated Catamentioning

confidence: 72%

Rerefining of Waste Lube Oil via Solvent Extraction Followed by Catalytic Hydrotreatment

2015

Egypt. J. Chem.

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“…The solvents were n-hexane, oxalic acid, hydrogen peroxide, and ammonium peroxydisulfate, [9], [8], [10], [11], [4] 2.2. Apparatus Three processes were adopted in this work: soluble coke removal, leaching of metals and removal of insoluble coke.…”

Section: B Solventsmentioning

confidence: 99%

Reuse of Spent Hydrotreating Catalyst of the Middle Petroleum Fractions

Abdulqahar¹,

Abdul-Wahab²,

Hummadi³

2019

IJCPE

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Reuse of spent hydrodesulphurization (HDS) of middle petroleum fractions catalyst CoMo/γAl2O3 was accomplished via removal of coke and contaminants such as vanadium, Iron, Nickel, and sulfur. Three processes were adopted; extraction, leaching, decoking. Soluble and insoluble coke was removed. Leaching step used three different solvents (oxalic acid, ammonium peroxydisulfate and oxalic acid + H2O2) in separate in order to remove contaminant metals (V, S, Ni and Fe). The effect of soluble coke removal on leaching step was studied. It was found that the removal of soluble coke significantly enhances the leaching of contaminants and barely affected the removal of active metals (Co and Mo). It was found that the best route (sequence) was soluble coke extraction followed by contaminants leaching then decoking process and the best leaching solvent was oxalic acid. According to this determination, the removed contaminants were 79.9 % for sulfur, 13.69% for vanadium, 82.27 % for iron, and 76.34 % for nickel. The active components loss accompanied with this process were 5.08 % for cobalt and 6.88% for molybdenum. Leaching process conditions (leaching solvent concentration, temperature and leaching time) were studied to determine the best-operating conditions. The rejuvenated catalyst activity was examined by a pilot scale HDS unit of naphtha. Sulfur content removal of naphtha was found to be 85.56 % for single pass operation under typical operating conditions of refinery HDS unit of naphtha which are 1 ml/min feed flow rate, 200 H2/HC ratio, 32 bar operating pressure and 320 °C operating temperature.

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“…Various types of additives in typical lubricating oil composition is shown in Table 1 [4]. Waste lubricating oil is distinctly a stable, almost homogeneous spread of undergirded base oil and additives contaminated with scrapings of metals from bearing surfaces, varnish, gums and other compounds from the degradation of the fresh engine oil [5]. About 50 % of base oil globally are naphthenes containing largely cyclic compounds derived from naphthenic crude stocks.…”

Section: Introductionmentioning

confidence: 99%

“…Sometimes, halogenated substances may results from addition of chlorine and bromine as lead scavengers in leaded gasoline. Polynuclear aromatic hydrocarbons (PAHs) contents made this spent lubricant carcinogenic [5]. Therefore, reclamation of the waste into virgin lubricating oil would be useful alternative to protect the environment.…”

Section: Introductionmentioning

confidence: 99%

Potentials of African Star Apple (<i>Chrysophyllum albidum)</i> Fruit Shell Adsorbent in Recovery of Valuable Hydrocarbons for Spent Engine Oil

Taiwo

Tokede

Sanda

2021

IJET

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Inventory of spent engine oil continuously increase and indiscriminately disposed of at auto-mechanics garages. Adsorptive separation established to be indispensable in recovery of these hydrocarbons was carried out using Chrysophyllum albidum (African star apple) fruit shell – a renewable resource. In this study, clay pretreated spent engine oil was recovered in a fixed bed adsorption processes and the recovered adsorbate components determined by GC-MS analysis. The results showed African star apple fruit shell adsorbent effective in recovering n-hexane solubilized spent lubricating oil. The study concluded that using the developed African star apple fruit shell adsorbent, an agricultural waste adsorbent in the recovery of waste lubricating oil will enhance greatly the nation’s economy.

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Hydrotreating of waste lube oil by rejuvenated spent hydrotreating catalyst

Cited by 22 publications

References 14 publications

Rerefining of Waste Lube Oil via Solvent Extraction Followed by Catalytic Hydrotreatment

Rerefining of Waste Lube Oil via Solvent Extraction Followed by Catalytic Hydrotreatment

Reuse of Spent Hydrotreating Catalyst of the Middle Petroleum Fractions

Potentials of African Star Apple (<i>Chrysophyllum albidum)</i> Fruit Shell Adsorbent in Recovery of Valuable Hydrocarbons for Spent Engine Oil

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