Research Article Open Access

Upgrading of Light Dewaxed Oil through Hydrofinishing and Additives Blending for Producing Automatic Transmission Fluid

Gamal Abdel-Nasser Gohar1, Mohamed Sherif El-Gayar1, Abd El-Moneim Ibrahim1, Hany1, Marwan1 and Ahmed Aly1
  • 1 , Afganistan
American Journal of Applied Sciences
Volume 3 No. 12, 2006, 2136-2146

DOI: https://doi.org/10.3844/ajassp.2006.2136.2146

Submitted On: 17 August 2006 Published On: 31 December 2006

How to Cite: Gohar, G. A., El-Gayar, M. S., Ibrahim, A. E., Hany, Marwan, & Aly, A. (2006). Upgrading of Light Dewaxed Oil through Hydrofinishing and Additives Blending for Producing Automatic Transmission Fluid . American Journal of Applied Sciences, 3(12), 2136-2146. https://doi.org/10.3844/ajassp.2006.2136.2146

Abstract

Light dewaxed oil was produced through dewaxing process of the light waxy distillate raffinate of crude oil from Western Desert of Egypt using methyl ethyl ketone/toluene mixed solvent. Hydrofinishing process was used to remove the non-hydrocarbon constituents and to improve the physicochemical properties of the produced oils such as color, viscosity index, inhibition responses, oxidation and thermal stability. The operating parameters which affected the quality of the hydrofinished oils were studied separately at different values that including reactor temperature, reactor pressure, liquid hourly space velocity and hydrogen to hydrocarbon ratio. The optimum operating conditions to be adopted for producing high quality automatic transmission fluid base oil were reactor temperature 290 oC, pressure 130kg cmˉ2, liquid hourly space velocity 0.4 hˉ1 and hydrogen/hydrocarbon ratio 800 Nm33. The effect of changing hydrofinishing temperature and liquid hourly space velocity on the hydrodesulfurization (HDS) and hydrodenitrogenation (HDN) reactions as well as their thermodynamic parameters were estimated. Calculations of activation energy (Ea) and free energy of activation (ΔG) indicated that HDS was easier to occur than HDN and these reactions are more faster at higher temperatures. The effect of commercial and formulated additives on the quality of the hydrofinished oil was also studied. Automatic transmission fluid possessing the Dexron IID specification was produced by adding 7 wt% from Infenium T442 additive or by adding 9 wt% from Lubrizol ® 6701 D additive to the hydrofinished light dewaxed oil. Oils with the same efficiency were also produced using a formulated additive containing 4% viscosity index improver, 1.5% anti-oxidant and 1% anti-wear. The effect of increasing Infenium T442, Lubrizol R 6701 D and formulated additive percents on the protection efficiency of the automatic transmission fluid was studied through AC impedance technique. According to this technique, the effect of these additives on the corrosion rate of carbon steel coupons can be negligible.

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Keywords

  • Light dewaxed oil
  • raffinate
  • hydrodesulfurization
  • hydrodenitrogenation
  • automatic transmission fluid