Browsing by Author "Ogunleye, Oladipupo O."

Now showing 1 - 4 of 4
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    Kinetic Modelling of Oil Extraction from Neem Seed
    (2014) Ogunleye, Oladipupo O.; Adewoye, Tunmise L.; Salawudeen, Taofeeq O.
    The suitability of three different types of extraction kinetic models (one- step, two –step and three – step models) for neem oil was investigated in this study. Solvent extraction using n-hexane at temperatures range between 303K and 323 K ; 360minutes of extraction time were experimented and the oil yield calculated. The three models were fitted to the experimental data obtained. The oil yield increased from 31.80 % to 41% at 303K and 323 K, respectively and the equilibrium was reached at 300 minutes. The saturation extraction capacity (Cs) increased from 35.0631 gL-1to 42.9698 gL--1303K and 323 K, respectively for one step model and the R2 ranged between 0.9874 and 0.9998. The washing mass transfer coefficient (CeW) of oil yields at equilibrium accounts for about 60% of the extraction in the two-step model and the R2 ranged between 0.9840 and 0.9960. The first coefficient of diffusion (wed1) in the three-step model had is higher value than the second (wed2) and R2 ranged between 0.9920 and 0.9980. The three-step model best fitted the experimental data.
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    MODELLNG AND OPTIMISATION OF OIL EXTRACTION FROM LOOFAH (LUFFA CYLINDRICA) SEEDS USING BINARY SOLVENT MIXTURE
    (Turkish Chemical Society, 2019) Eletta, Omodele A. A.; Adewoye, Latifat T.; Mustapha, Sherif I.; Adeniyi, Adewale G.; Ogunleye, Oladipupo O.; Aladerokun, Oladimaji E.; Tijani, Idowu A.
    Toxicity and safety concern coupled with the recent increase in its price has necessitated the need for finding alternative solvents to n-hexane. In this study, the effect of binary solvent (ethanol/n-hexane) composition at various extraction temperatures and times on the oil yield was investigated using response surface methodology (RSM). Artificial neural network (ANN) was used as a modelling tool for predicting the oil yield and the performance of both ANN and RSM models was compared. The optimum oil yield (27.67%) was obtained at extraction temperature (40 °C), extraction time (151.9 min) and binary solvent composition (98% ethanol /2% n-hexane). The predicted oil yield values from ANN model was more accurate than that of RSM when compared with experimental values. The fatty acid profile revealed that the refining process promoted saturation of the extracted oil with 67.75% of palmitic acid present in refined loofah seed oil (RLSO). This study demonstrated the feasibility of using a binary mixture of ethanol and n-hexane as a suitable replacement to the commonly used toxic n-hexane solvent for the extraction of oil from loofah seeds.
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    Optimization of the adsorption of total organic carbon from produced water using functionalized multi-walled carbon nanotubes
    (Elsevier, 2021-01) Adewoye, Tunmise L.; Ogunleye, Oladipupo O.; Abdulkareem, Ambali S.; Salawudeen, Taofeeq O.; Tijani, Jimoh O.
    This study investigated the removal of Total Organic Carbon (TOC) from produced water by batch adsorption process using adsorbents developed from Multi-Walled Carbon Nanotubes (MWCNTs). The MWCNTs, synthesized by catalytic chemical vapour deposition method using kaolin-supported tri-metallic (iron-cobalt-nickel) catalyst were purified by H2SO4/HNO3 and then functionalized with 1-pyrenebutanoic acid N-hydroxyl succinimidyl ester (PSE). The raw, purified and functionalized MWCNTs were characterized by High Resolution Scanning Electron Microscopy (HRSEM), High Resolution Transmission Electron Microscopy (HRTEM), Brunauer–Emmett-Teller (BET) and Fourier Transform Infrared Spectroscopy (FTIR). In the results, HRSEM/HRTEM revealed the structure, purity and also confirmed the attachment of the PSE molecule onto the nano-adsorbent(s). The BET surface areas of MWCNTs, PMWCNTs and FMWCNTs were 970.17, 869.25 and 831.80 m2/g, respectively while the FTIR established the existence of surface functional groups. The functionalized MWCNTs (FMWCNTs) nano-adsorbent showed superior performance efficiency (93.6%) than the purified MWCNTs (PMWCNTs) (79.2%) as examined under the same batch adsorption condition: 0.02 g adsorbent dosage, 10–90 min contact time and 30 °C solution temperature probably, due the improved wettability resulted from incorporation of PSE. Subsequently, Central Composite Design (CCD) was applied to optimize the process parameters for the sorption of TOC onto FMWCNTs. The CCD in the response surface methodology predicted 260 mg/g adsorption capacity of FMWCNTs in the removal of TOC at the optimum condition of 49.70 min contact time, 34.81 °C solution temperature, and 0.02 g adsorbent dosage. The kinetics data were best described by pseudo-second-order model and thermodynamic parameters suggested that the process was feasible, spontaneous and exothermic. It can be inferred from the various analysis conducted that the developed FMWCNTs nano-adsorbent is effective for removal of TOC from oil-produced water and may be explored for removal of organic contaminants from other industrial wastewater.
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    PROCESS OPTIMISATION AND CHARACTERISATION OF FRAGRANCE SUITED MECHANICALLY EXPRESSED NIGERIAN LIME SEED OIL
    (2018-04) Adeniyi, Adewale G.; Adewoye, Latifat T.; Eletta, Omodele A. A.; Ogunleye, Oladipupo O.; Olukotun, Kenneth
    This study determined the optimal process parameters for the extraction of Lime (Citrus aurantifolia) Seed Oil (LSO) for fragrance production. A Box Behnken Design (BBD) of Response Surface Methodology (RSM) was used to design the LSO extraction using hydraulic press. The effect of various combinations of temperature, heating time and pressing time on oil yield, specific gravity, acid value, saponification value, FFA, Iodine and peroxide values were investigated. The oil produced was analysed using Gas Chromatography – Mass Spectrophotometer (GC-MS). The R2 - values of models ranged between 0.998 and 0.999 and adjusted R2 between 0.994 and 0.998. A maximum of 29.21 % of LSO yield was obtained with specific gravity (0.861), acid value (2.86 mg KOH/g); saponification value (185.3 mg KOH/g), FFA (≤ 1.43 %), Iodine value (107.8 g I2/100 g) and peroxide value (15meq/kg) at the optimal process parameters of 83oC, 8 min and 7 min temperature heating and pressing time respectively. The physico-chemical analysis of the lime seed oil indicated that the oil could be used for fragrance.