Programme: Chemical Engineering

Permanent URI for this collectionhttps://repository.covenantuniversity.edu.ng/handle/123456789/30806

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A Review of Corrosion Threat in Marine Industry
(Key Engineering Materials, 2025) Odunlami, Olayemi; Fajobi, Muyiwa; Nnaji, Uchenna; Uriah, Abigail; Gawati, Tomisin; Oladimeji, Temitayo E; Adisa, Hassan
Corrosion poses a significant challenge in the marine industry, leading to the deterioration of equipment and structures, and resulting in substantial costs for its management and control. This comprehensive review focuses on how metal structures in marine environments, such as ships, are affected by corrosion. It explores different forms of corrosion and strategies to prevent it, particularly in the context of marine vessels. The review includes real-world examples of ships, highlights the financial impact of corrosion in the marine sector, and examines the factors contributing to its occurrence. Corrosion prevents a significant issue for marine vessels and related equipment due to the potential damage to the metal they are constructed from. However, there are effective methods to mitigate this problem, such as employing corrosion-inhibiting substances and selecting appropriate materials. The susceptibility of materials to corrosion varies depending on their composition, resulting in either widespread deterioration or localized damages. By thoroughly examining the corrosion challenge within the maritime industry, this review provides insights into managing and mitigating its effects more efficiently.
A review on the sustainable energy generation from the pyrolysis of coconut biomass
(Scientific African (Elsevier), 2021) Azeta Osarhiemhen; Ayeni A. O.; Agboola O.; Elehinafe Francis B.
he negative impacts of the extraction and exploration of fossil fuel on the environment and its depletion that has led to environmental degradation have encouraged researchers, stakeholders, and the government to explore alternative and renewable energy sources such as lignocellulosic biomass. Biomass pyrolysis has proven to be a viable energy conversion process over the last decade due to its low carbon footprint on the environment. Pyrolytic products that are bio-char, bio-oil, and bio-gas have several applications and contribute to our society’s industrial, commercial, and economic growth. This paper reviews the different types of pyrolytic processes using coconut biomass as a feedstock while focusing on the biomass properties that make it useful for pyrolysis and the factors affecting the process.
A Simplified Design for Biodiesel Production
(International Conference on Engineering for Sustainable World (IOP Publishing), 2021) Ayoola A. A.; Alagbe E. E.; Agboola O.; Ayeni O. A.; Adeyemi G. A.; Nnabuko D.; Makinwa
Advanced techniques for the capturing and separation of CO2 – A review
(Results in Engineering, 2022) Odunlami, O. A.; Vershima, D. A.; Oladimeji, T. E.; Nkongho, S.; Ogunlade, S. K.; Fakinle, B. S.
The review was carried out to compare the efficiencies of the advanced and modern techniques for the capturing of CO2 and those (technologies) which are already in place. The ever-growing concern for the need to reduce and eliminate the effects of CO2 in the atmosphere has led to major areas of CO2 capture, over the years, to be explored and applied. Several techniques such as adsorption, absorption, cryogenic separation technique, membrane and a combination of two or more of these techniques were explored to determine which was most effective in the carbon capture process. A combination of the principles of these techniques were explored to determine how they can be applied in the advanced techniques of the CO2 capturing and storage processes, within this new age. Absorption stands out as the most commonly used technique for carbon capture. However, it is energy intensive and depending on the solvent used (i.e., ethanol), can be corrosive to the vessel it is utilized in. The review explored advanced methods for carbon dioxide capture such as the use of ionic liquids, zeolites, molten carbonate fuel cell and integration with several other components that enhance, not only their efficiencies, but also other physio-chemical properties that encourage its advancement. These were explored in the course of writing this review paper. From the review, it was discovered that Ionic liquids, integrated with membranes, enhance selectivity towards efficient CO2 capture. Zeolites occur naturally or are produced synthetically. They comprise of metal ions, are porous and made of certain ligands. They apply the principle of adsorption to remove CO2 and store. Molten carbonate fuel cells operate at high temperatures (usually at 600 ◦C) and have CO2 removal efficiencies of up to 60%. The review paper was, successfully, able to identify some of the major advanced technologies in the process of Carbon capture and the principles, efficiencies and costeffectiveness were described, appropriately. From the literature, molten carbonate fuel cells were the best of the three advanced methods, with high efficiency and operations at high (and varying) ranges of temperature
Air quality investigation over Moundou Chad
(International Conference on Energy and Sustainable Environment, 2019) Emetere, M. E.; Oladimeji, Temitayo E
The air quality over Moundou-Chad was examined using satellite dataset. Fifteen years aerosol optical depth (AOD) was obtained from the Multi-angle Imaging Spectro Radiometer (MISR). The AOD dataset is statisticaly stable for further prediction. The highest AOD mean was observed in 2008. The standard deviation, average deviation and coefficient of variation all agrees that the AOD dataset is reliable. It is shown that the aerosol loading over Moundou is high and the size of the aerosol is very tiny to deposit in the human lungs.
Application of mass transfer in the pulp and paper Industry􀀀 overview, processing, challenges, and prospects
(Results in Engineering (Elsevier), 2023) Odunlami Olayemi A.; Amoo Temiloluwa E.; Adisa Hassan A.; Elehinafe Francis B.; Oladimeji Temitayo E.
This study reviews the mass transfer with a focus on the challenges, benefits, processing and prospects in the pulp and paper industry with a scope limited to Kraft pulping which is the dominant pulping process worldwide. The mass transfer usually occurs in various processes that deal with reactions, separation, and heat transfer. All these aforementioned processes occur in the production of pulp and paper from their raw materials. The application of mass transfer to these processes is of great importance in setting target yields, and specifications and improving efficiency. The major processes where mass transfer principles are applied are drying, chemical washing, pulp digestion and pulp bleaching respectively. Understanding the requirements and targets of each of these processes in combination with the mass transfer principles helps in the development of models and design of equipment that operate based on the developed models in meeting the required targets. Studies have indicated that mass and energy balances cannot be done independently in meeting the required targets and equipment design. The drying and stripping of lignocellulosic components of the feed-in paper manufacture constitute a large part of the challenges faced by the industry. Drying techniques have been considered to be inefficient, and lignocellulosic by-products are known to contain toxic components. Green chemistry production processes and newer drying techniques were indicated as possible solutions. It is expected that researchers and investors would find this article useful.
AReviewonPolymer Nanocomposites and Their Effective Applications in Membranes and Adsorbents for Water Treatment and Gas Separation
(Membrane, 2021) Agboola, Oluranti; Fayomi, O. S. I.; Ayoola, Ayodeji Ayodele; Ayeni, Augustine Omoniyi; Alagbe, Edith E; Sanni, Samuel E; Okoro, Emmanuel E.; Moropeng, Lucey; Sadiku, Rotimi; Kupolati, Kehinde Williams; Oni, Babalola Aisosa
Building Production Management Practice in the Construction Industry in Nigeria
(Engineering Management in Production and Services Volume 12 • Issue 2, 2020) Osuizugbo, Innocent Chigozie; Ojelabi, Raphael Abiodun
A B S T R A C T Growing demands for building projects result from economic development. The building industry is dynamic and multifaceted. Efficient and effective practice of building production management (BPM) is required to successfully execute projects and achieve project goals upon completion as well as functionality aims for the lifespan of a building. This research aims to determine factors that influence the BPM practice in the Nigerian construction industry, particularly; during the project execution phase. A cross-sectional survey used; a questionnaire to identify 73 factors, which were grouped into 12 categories and assessed. A purposive sampling technique was used to identify 20 construction organisations specialising in building production management in Lagos, Nigeria. 114 questionnaires were distributed to the pool of stakeholders, which included 31 clients, 34 consultants and 49 contractors of current and past building production projects carried out by the selected firms in Lagos. The research used a selection of statistical tools for SPSS v.23, including the chi-square test, the Kruskal-Wallis test and Kendall’s coefficient of concordance. The obtained result revealed the factors that mostly influence the BPM practice namely, architectural drawings, the construction programme document, the work breakdown structure, the adequacy of communication and coordination between the parties, the adequacy of raw materials and equipment, the availability of the competent team, the implementation of the safety management system, regular maintenance of project equipment, clear and timely inspections, the availability of funds as planned throughout the project duration, the availability of skilled personnel, and the aesthetics of the completed work. The research resulted in the development of the BPM implementation framework and recommendations for the improvement of the BPM practice in Nigeria.
COMPARATIVE STUDY OF NON-METALLIC CONTENTS OF SAWDUST OF DIFFERENT WOOD SPECIES AND COAL SPECIES IN NIGERIA
(Petroleum and Coal, 2019) Elehinafe, Francis Boluwaji; Okedere, Oyetunji Babatunde; Odunlami, Olayemi. Abosede; Oladimeji, Temitayo E; Mamudu, Angela Onose; Sonibare, Jacob Ademola
The study assessed the non-metallic contents of sawdust samples by ultimate analysis and compared with those of coal species found in the literature. The results showed that the sawdust of the wood species have: carbon contents ranged from 43.78% for Uapaca heudelotii to 62.95% for Irvingia excels; hydrogen contents ranged from 4.35% for Entada gigas to 7.07% Parkia biglobosa;; sulphur contents ranged from 0.00% for Pterygota macrocarpa to 0.09% Spondias mombin; nitrogen contents ranged between 0.00% for Blighia sapida and 1.70% for Khaya ivorensis, and oxygen contents ranged between 30.08% Macaranga barteri and 50.61% Uapaca heudelotii. It was concluded that utilization of sawdust as energy source has minimal or no environmental concerns, unlike coal.
Construction Quality Management Automation: Building Information Modeling (BIM) and Emerging Technologies (ET): A Review
(EPiCSeries in Built Environment Volume 6, 2025) Ogunrinde, Olugbenro; Burgoon, Jared; Oyeyipo, Opeyemi; Ojelabi, Rapheal
Construction productivity has been nearly stagnant for decades and traditional productivity metrics hinder progress. Addressing these challenges is critical for improving productivity. Emerging technologies like BIM present a viable solution for enhancing performance and productivity. Construction quality management processes (CQM) offer the potential for improving productivity; however, the construction industry is slow to adopt innovation. Manufacturing and other industries have seen productivity growth of 3.6% and 2.8% respectively because of the introduction of cutting edge technology for reducing human errors compared to construction’s that remains at 1% over the last two decades mostly due to conventional approach. Therefore, this paper reviews existing literature and identifies BIM integrative technologies that can enhance the CQM processes to improve productivity and reduce human errors. The study identified visualization modeling and automation systems technologies that can be integrated with BIM to guide stakeholders toward adoption and use for quality evaluation processes. Visualization modeling and automation system technologies that can be applied across various quality management categories are identified, offering insights for construction stakeholders. These technologies are positioned as key tools for improving the industry’s efficiency and guiding stakeholders toward more effective quality evaluation and management practices.
CONTROL OF FOSSIL FUEL GAS OPERATING CONDITIONS ON THE PERFORMANCE OF CARBON DIOXIDE CAPTURE PROCESS
(2021) Letsholo I.; Moropeng M. L.; Mavhungu A.; Agboola O.; Fayomi O. S. I.; Moropeng R. C.
CORROSION INHIBITION BEHAVIOUR OF CALF THYMUS GLAND DNA ON MILD STEEL IN SULPHAMIC ACID
(Covenant University Ota, 2025-04) Ekere Isaac E.; Covenant University Thesis
Inorganic acid cleaners based on sulphamic acid are frequently employed in industrial equipment cleaning, descaling and acidizing. This application of sulphamic acid in industrial cleaning is not entirely without its drawback as the cleaning action usually leads to dissolution and loss of base metals. The addition of corrosion inhibitors is one of the industrial practices employed to minimize equipment corrosion damage. The purpose of this work was to assess the viability of deoxyribonucleic acid (DNA), extracted from calf thymus gland, as an inhibitor for mild steel corrosion in sulphamic acid medium, and in comparison, with salmon Fish DNA and INDION 5489, a commercial inhibitor. The inhibition process was investigated using weight loss, potentiodynamic polarisation, SEM/EDX and FTIR measurements. Response surface method (RSM) and artificial neural network (ANN) were employed to determine the optimum corrosion inhibition conditions. The weight loss measurements obtained the highest inhibition efficiency of 82.71% at 303 K and immersion time of 6 h by addition of 2.5 mg/L of calf thymus DNA, CTGDNA. The corrosion rate was also observed to decrease with an increase in inhibitor concentration. Potentiodynamic polarisation curves showed a shift in Ecorr < 85 mV an indication that CTGDNA is a mixed inhibitor, suppressing both cathodic and anodic reactions. An RSM generated polynomial model obtained an optimum efficiency of 72% at 303 K, 5.5 mg/L after 2.12 h immersion. Estimation by ANN, with minimal errors, and a higher R2 of 0.983 in comparison to 0.925 for RSM were close to the experimental inhibition efficiency. CTGDNA adsorption on mild steel modelled the Langmuir isotherm with a linear regression coefficient of 0.99. The increase in the activation energy from 37.54 kJ/mol to 52.5 kJ/mol after 2 h immersion; with a similar trend for 4 and 6 h demonstrated that addition of CTGDNA favoured physioisorption. The small and negative value of entropy was an indication that the adsorption of CTGDNA was spontaneous. FTIR confirmed the presence of protective film formed by CTGDNA inhibitor on the mild steel surface at various concentration. SEM images showed reduction in the degradation of mild steel surface in the uninhibited solution after addition of CTGDNA. The comparative studies obtained a weight loss of 0.0036, 0.0047, 0.0072 and 0.0086 mg in 10% sulphamic acid in the presence of CTGDNA inhibitor, salmon fish DNA, conventional cleaning solution and blank solution of 10% sulphamic acid without an inhibitor, respectively. This confirmed that the CTGDNA inhibitor enhanced the 10% sulphamic acid cleaning solution as a suitable and viable cleaning agent for mild steel in comparison with INDION 5489.
CORROSION INHIBITION OF A36 MILD STEEL IN ACIDIC MEDIUM USING Citrus paradisi Rind Inhibitor
(Rasayan J. Chem., 15(3), 2022-07) Ayoola, Ayodeji Ayodele; Olulesho, S; Durodola, Bamidee; Agboola, o.; Oladokun, O.; Ayeni, A.; Fayomi, O. S. I.; Babalola, R.
The effectiveness of grapefruit (citrus paradisi rind) peel powder as a green corrosion inhibitor on A36 mild steel in 0.5M H2SO4 was examined. Gravimetric tests, SEM-EDS, and adsorption isotherm techniques were used to determine the corrosion inhibition features of the inhibitor on the surface of A36 mild steel. The tests were carried out with variation in concentration of inhibitor (0–0.4 %w/v), corrosion temperature (301K and 318K), and corrosion time (3 12 hours). The findings demonstrated that citrus paradisi rind powder effectively inhibited the corrosion of A36 mild steel on the surface with maximum corrosion inhibition efficiency of 85% at 0.4 w/v% inhibitor concentration at 310K corrosion temperature. The SEM-EDS analysis established the presence of sulphur, nitrogen, and oxygen (organic constituents), as well as the formation of a protective coating on the mild steel surface. Langmuir adsorption isotherm was found suitable for the prediction of the adsorption of citrus paradisi rind inhibitor on the mild steel surface. The thermodynamic considerations (∆𝐻 and (∆𝑆) indicated that the inhibition of A36 mild steel corrosion (using citrus paradisi rind inhibitor) was an exothermic process and the inhibitor molecules were physically adsorbed on the metal surface.
Corrosion Inhibition on Mild Steel using Zinc Phosphating Modified with Magnesium and Calcium Additives
(Portugaliae Electrochimica Acta 44, 2026) Ayoola, Ayodeji Ayodele; Durodola, M. E.; Babalola, R.; Fayomi, O. S. I.; Okoji, A.; Agbeyegbe, G. A.; Obigwe, C.
MS is a very versatile and useful alloy in metal industry, since it is available and affordable, but it is prone to corrosion. This study investigated MS corrosion inhibition by modifying Zn₃(PO₄)2 bath with MgO and, then, with combined MgO and CaO additives. Different phosphating times (40, 60 and 80 min) and T (65 and 80 °C) were considered. Ct from 0 to 1.8 g/L MgO and combined MgO/CaO additives were added to Zn₃(PO₄)2 bath. SEM analysis of the coated samples was carried out. The specimens were also immersed in 3.5 wt% NaCl, for WL testing. Obtained results showed that the highest IE(%) of 56% was obtained for the MS sample at a phosphating T of 65 °C and Ct of 1.8 g/L MgO additive. For combined MgO and CaO additive, an IE(%) of 32% was obtained, at 65 °C, with a Ct of 0.9 g/L. MgO and CaO adsorption process (separately and combined) onto MS followed Freundlich’s adsorption model. ΔG indicated a physical adsorption process, and ΔH indicated an exothermic adsorption process, while ΔS during coating revealed a decrease in the process randomness degree.
Corrosion inhibitive effects of calcium-modified zinc phosphate coating on A36 mild steel
(Results in Engineering, 2023) Ayoola, Ayodeji Ayodele; Durodola, B. M.; Bablola, R.; Adeniyi, O. D.; Ilobinso C. E.
In this work, the corrosion inhibitive performance of calcium modified zinc phosphate coating on A36 mild steel was studied. Treated A36 mild steel samples were subjected to coating through immersion in phosphating bath containing varied concentrations of calcium oxide (0–2.5 g/L) at different operating temperatures (60–80 C) and immersion time (30–60 min). The coated samples were then subjected to corrosion tests (weight loss and inhibition efficiency determination) in 3.5% NaCl solution, to examine the anticorrosion behaviour of the coated mild steel in NaCl solution. The calcium modified phosphating process which was carried out at 80 ◦ ◦ C with calcium concentration of 2.5 g/L gave a better and more uniform coating on A36 mild steel surface, as confirmed by visual inspection and SEM/EDS analysis. Also, Freundlich adsorption isotherm was found suitable for the prediction of the adsorption of both calcium and zinc particles on A36 mild steel, as indicated by the coefficient of determination (R 2 ) values of approximately one. The adsorption of both the zinc and calcium particles on A36 mild steel was found to be spontaneous and physical process, as revealed by the values of K ads and ΔG ads .
Corrosion mitigating techniques and the mechanisms: Comment
(International Conference on Engineering for Sustainable World (IOP Publishing), 2021) Ayodeji A. I.; Fayomi O.S.I.; Babaremu K. O.; Abioye P. O.; Agboola O.; Daniyan A. A.
A lasting solution is required to curb the corrosion attack because of the very destructive effect it has on engineering materials. Corrosion is a material degrading phenomenon that reduces the significant properties of metallic materials, making them less useful. This paper has been able to highlight the very suitable methods or techniques that help to mitigate the effect of corrosion on metals and other helpful engineering materials. Some of these methods are electrodeposition and protective coatings like organic coatings, inorganic coatings, and metallic coatings.
Data on the corrosion Inhibition Property of Rosemary on High Carbon Steel in dilute sulphuric acid, citric acid and sodium chloride solution
(Chemical Data Collections (Chemical Data Collections ), 2021) Odunlami, Olayemi; Loto, R. T.; Fajobi, Michael Ayobami; Olomukoro, O. T.; Akande, I. G.; Oke, M. A.; Oladimeji, Temitayo E
The data of electrochemical analysis of Rosmarinus officinalis (RO) essential oil effect on high carbon steel (HCS) in three different corrosive environment of sodium chloride, sul- phuric acid and citric acid solution was achieved via weight loss method. Results revealed that Rosmarinus officinalis (RO) organic compound performed excellent well on high carbon steel samples with the optimum inhibition value occurring in NaCl solution with 97.87% after 504 h. The corrosion rate values were significantly high at 0 ml RO organic com- pound for all the three (3) corrosive environments as the time of immersion moves down to 504 h. It was clearly observed that time of immersion and concentrations of RO are the main determinant factor for the excellent adsorption performance of RO organic compound within the range of 504 h. Also, Rosmarinus officinalis (RO) organic compound retarded the severe corrosion rate of high carbon steel samples in other corrosive solutions with aver- age range inhibition values between 40 and 78% after 504 h.
Data on the effect of Ibruprofen drug derivative on 430T1 stainless steel in acid solutions
(International Conference on Engineering for Sustainable World (IOP Publishing), 2021) Sanni O.; Fayomi O. S. I.; Popoola A. P. I.; Agboola O.
Demulsification of a Nigerian crude emulsion using ethoxylated-resoles and their xylene modified blends
(International Conference on Recent Trends in Applied Research, 2021) Efeovbokhan, Vincent E.; Chibuzor, Chukwuebuka C.; Babalola, Rasheed; Abatan, Olubunmi G; Oladimeji, Temitayo E
Demulsification is a method used to reduce or disrupt the water - crude oil emulsion system without uttering the initial composition of the crude oil. This process is done by the introduction of chemicals called demulsifiers, which break the emulsion into aqueous and organic phases. In this study, the demulsifier formulated was the base-catalyzed phenol formaldehyde resin known as the resoles, with the ratios of phenol to formaldehyde, varied between 1.0:1.2 and 1.0:2.0. The different samples of resoles where then ethoxylated to make them more hydrophilic using different weights (10, 15 & 20 g) of polyethylene glycol (PEG). Screening of the ethoxylated demulsifiers was done using the established bottle test procedure, at 70 °C, the concentration of 50 ppm, and 20 minutes of residence or separation time, in order to select the most effective demulsifier, based on the amount of water removed from the emulsion. The best chemical-demulsifier produced was the ethoxylated resole, which was then blended with xylene at varying percentages (0, 20, 40, 50, and 80 % weight/weight) and was further screened, using the bottle test method. From the analysis, it was obtained that the most effective ethoxylate-xylene demulsifier blend was sample DR3, and made of formaldehyde to phenol ratio of 1.8:1, 20 g of PEG 400 blended with 20 % xylene. The demulsifier gave a water separation efficiency of 85.7 %, compared with the commercial demulsifier, which yielded 72.7 %. The result indicates the practical significance of solvent modified demulsifiers for separating crude oil emulsions in the petroleum industries.
Emissions of CO and SO2 from solvent extraction treatment of used lubricant
(4th International Conference on Science and Sustainable Development, 2021) Oladimeji, Temitayo E.; Sonibare, Jacob A.; Omoleye, James A.; Emetere, Moses, E.; Odunlami, Olayemi, A.
Emissions fromused lubricant could have adverse effect on man and its environment due to the presence of degraded additives and contaminants. Different treatment methodshas been developed with few check on its pollution aspect. This study investigated the emissions of two major criteria pollutants - carbon monoxide (CO) and sulphur dioxide (SO2) from the solvent extraction treatment of used lubricant. CO was found to be the highest emitting pollutant with mean emission concentration of 85.85 mg/m3 which has exceeded the set NAQS standard while SO2 falls within the standard limit. Therefore,there is a great need to give attention to the control of CO emissions around the treatment plant. However, CO emission can be controlled by employing a CO converter to convert the poisonous gas to a less poisonous gas or substituting the existing process in solvent extraction with a more environmentally friendly one.