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Energy Valorization by Continuous Pyrolysis of Straight Vegetable Oils (SVOs)

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Green and Sustainable Chemistry 2018年第1期8卷 19-31页

作者： Abollé Abollé konan edmond kouassi Henri Planche Albert Trokourey kouassi Benjamin Yao Ado Ado Gossan Unité de Formation et de Recherche-SFA Université Nangui Abrogoua (UNA) Abidjan Republic of C&#244 te d’Ivoire Unité de Chimie et Procédés Ecole Nationale Supérieure des Techniques Avancées Paris France Unité de Formation et de Recherche-SSMT Université Houphou&#235 t-Boigny (UFHB) Abidjan Republic of C&#244 te d’Ivoire Institut National Polytechnique Félix Houphouë t-Boigny Yamoussoukro Republic of C&#244 te d’Ivoire

Researches have been undertaken to find a form of valorization of the surplus production of vegetable oils in Côte d’Ivoire for their use as a substitute diesel. The first tests of the use of crude oils-diesel blends by the company Palmindustrie faced enormous difficulties. We have therefore undertaken a campaign of pyrolysis of Tropical Straight Vegetable Oils: palm, copra, peanut, cotton, cabbage palm and shea, between 400°C and 600°C under atmospheric pressure. A silica support was used in co-catalysis either with water or with methylcyclohexane, which is a model compound of cetanes contained in gas oil. This compound has the advantage, unlike the gas oil itself, of not masking the peaks of the pyrolysis recombinates of oils in the chromatograms. The condensed organic phase consists mainly of hydrocarbons including paraffins, olefins, alkylbenzenes and styrenes. The yields of liquid hydrocarbons vary between 72% and 86%. A comparative study of coke precursors and gas production was carried out. A discussion on the parameters to be considered for a large-scale implementation was undertaken.

关键词： Straight Vegetable Oils (Palm Copra Peanut Palm Kernel Cotton and Shea) Hydrocarbons Coke

Study of the Viscosity and Specific Gravity of the Ternary Used Frying Oil (UFO)-Bioethanol-Diesel System

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Journal of Materials Science and Chemical Engineering 2024年第4期12卷 53-66页

作者： konan edmond kouassi Abollé Abolle N’guessan Luc Brou David Boa N’guessan Raymond Kre kouassi Benjamin Yao Laboratoire de Thermodynamique et Physico-Chimie du Milieu (LTPCM) UFR-SFA UNA Abidjan C&#244te d&#8217Ivoire Laboratoire de Physiques Fondamentales et Appliqué es (LPFA) UFR-SFA UNA Abidjan C&#244te d&#8217Ivoire Laboratoire des Procé d&#233s Industriels de Synth&#232se de l&#8217Environnement et des Energies Nouvelles (LAPISEN) de l&#8217Institut National Polytechnique F&#233lix Houphou&#235t Boigny de Yamoussoukro Yamoussoukro C&#244te d&#8217Ivoire

Fossil fuels cover around 80% of global energy consumption. However, the problems linked to their use justify the choice of using biofuel. In order to reduce as much as possible, diesel rate, an increase in the number of additives may be considered. Thus, in this work, the study of the used frying oil (UFO), bioethanol and diesel ternary system was undertaken. It emerges from this study that the addition of bioethanol reduces the viscosity and the density of the ternary system and permits a 90% substitution rate for diesel between the UFO and bioethanol. Finally, the percentage of oil becomes 40% after adding alcohol compared to the binary diesel crude vegetable oil mixture where this rate is 30%.

关键词： Biofuel UFO-Bioethanol-Diesel Ternary Density Viscosity

Optimization of Biofuel Formulation by Mixture Design

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Advances in Chemical Engineering and Science 2024年第1期14卷 48-56页

作者： konan edmond kouassi Abollé Abollé Kouamé Olivier-Marc Kouakou David Boa N’guessan Raymond Kré kouassi Benjamin Yao Laboratory of Thermodynamics and Physical Chemistry of the Environment (LTPCM) UFR-SFA University of Nangui ABROGOUA Abidjan C&#244te d’Ivoire Laboratory of Fundamental and Applied Physics (LPFA) UFR-SFA University of Nangui ABROGOUA Abidjan C&#244te d’Ivoire Laboratory of Industrial Processes for the Synthesis of the Environment and New Energies (LAPISEN) of the Félix Houphouë t Boigny National Polytechnic Institute Yamoussoukro C&#244te d’Ivoire

With the full growth of energy needs in the world, several studies are now focused on finding renewable sources. The aim of this work is to optimise biofuel formulation from a mixture design by studying physical properties, such as specific gravity and kinematic viscosity of various formulated mixtures. Optimization from the mixture plan revealed that in the chosen experimental domain, the optimal conditions are: 40% for used frying oil (UFO), 50% for bioethanol and 10% for diesel. These experimental conditions lead to a biofuel with a density of 0.84 and a kinematic viscosity of 2.97 cSt. These parameters are compliant with the diesel quality certificate in tropical areas. These density and viscosity values were determined according to respective desirability values of 0.68 and 0.75.

关键词： Biofuel Optimization Mixture Design

Optimization of Rubber Seed Oil Transesterification to Biodiesel Using Experimental Designs and Artificial Neural Networks

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Green and Sustainable Chemistry 2018年第1期8卷 39-61页

作者： konan edmond kouassi Abollé Abolle Abolle kouassi Benjamin Yao David Boa Kopoin Adouby Patrick Drogui Rajeshwar Dayal Tyagi Laboratoire de Procédés Industriels de Synthèse de l’Environnement et des Energies Nouvelles Groupe des Procédés et Environnement Institut National Polytechnique Félix Houphou&#235 t-Boigny Yamoussoukro C&#244 te d’Ivoire Laboratoire de Thermodynamique et Physico-Chimie du Milieu UFR Sciences Fondamentales et Appliquées Université Nangui Abrogoua Abidjan C&#244 te d’Ivoire Institut National de la Recherche Scientifique (INRS-Centre Eau Terre et Environnement) Université du Québec Québec Canada

The development of biofuels is driven both by concern about the greenhouse effect and by interest in the opportunities for exploitation of biomass of agricultural origin. In order to improve the yield and quality of biodiesel through modeling and optimization, several studies are in progress. In this paper, biodiesel produced from rubber seed oil in the homogeneous transesterification is studied using a Plackett-Burman experimental design, a full factorial design, a central composite design and an Artificial Neural Network (ANN) coupled with a Genetic Algorithm (GA).Variables such as temperature, stirring speed, reaction time, type of alcohol, and type of catalyst are studied to obtain the best specific gravity and kinematic viscosity. Type of alcohol and type of catalyst have the greatest effect on the two responses, with ethanol (alcohol) and sulphuric acid (catalyst) producing the best results. The specific gravity and kinematic viscosity changes recorded during the transesterification process followed the first and second order polynomial models, respectively. The ANN coupled with GA was used to optimize the two responses simultaneously. Global optimal values of specific gravity (0.883) and kinematic viscosity (6.76 cSt) were recorded when a temperature of 90°C, a stirring speed of 305 rpm, and a treatment time of 141 min were imposed.

关键词： Rubber Seed Oil Biodiesel Transesterification Specific Gravity Kinematicviscosity

Modeling and Optimization of Two Clays Acidic Activation for Phosphate Ions Removal in Aqueous Solution by Response Surface Methodology

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Journal of Water Resource and Protection 2019年第2期11卷 200-216页

作者： Yao Joseph Adjoumani Pierre Jean Marie Richard Dablé konan edmond kouassi Soumahoro Gueu Alain Stéphane Assémian kouassi Benjamin Yao Laboratoire Thermodynamique Traitement et Sciences des Surfaces et Interfaces Ingénierie et Physicochimie des Procédés et de Mécaniques des Matériaux (L2TSIPM) Institut National Polytechnique Félix Houphou&euml t Boigny INP H-B Yamoussoukro C&ocirc te d’Ivoire Laboratoire des Procédés Industriels de Synthèse et de l’Environnement (LAPISEN) Institut National Polytechnique Félix Houphou&euml t Boigny INP H-B Yamoussoukro C&ocirc te d’Ivoire

This work deals with phosphate ions removal in aqueous solution by adsorption carried out using two clays, both in activated form. One, non-swelling clay, rich in kaolinite, is associated with illite and quartz. The other, swelling, richer in montmorillonite, is associated with kaolinite, illite and quartz. Seven factors including these two clays were taken into account in a series of experimental designs in order to model and optimize the acidic activation process favoring a better phosphate removal. In addition to the choice of clay nature, the study was also interested in the identification of the mineral acid, between hydrochloric acid and sulfuric acid, which would promote this acidic activation. Response Surface Methodology (RSM) was used for this purpose by sequentially applying Plackett and Burman Design and Full Factorial Design (FD) for screening. Then, a central composite design (CCD) was used for modeling the activation process. A mathematical surface model has been successfully established. Thus, the best acidic activation conditions were obtained by activating the montmorillonite clay with a 2N sulfuric acid solution, in an acid/clay mass ratio of 7.5 at 100°C for 16H. The phosphate removal maximum rate obtained was estimated at 89.32% ± 0.86%.

关键词： Clay Acidic Activation Modeling Optimization Phosphate Removal Response Surface Methodology

Physical and Chemical Characterizations of Rubber Latex Cup Bottom Oil

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Advances in Bioscience and Biotechnology 2024年第9期15卷 511-521页

作者： kouassi konan edmond Abolle Abollé Aketchi Tanoé Lucien konan Affoué Tindo Sylvie Boa David Yao kouassi Benjamin Laboratoire de Thermodynamique et Physico-Chimie du Milieu (LTPCM) Unit de Formation et de Recherche Sciences Fondamentales et Appliques Universit Nangui Abrogoua Abidjan Cte dIvoire Laboratoire des Procds Industriels de synthse de lEnvironnement et des Energies Nouvelles (LAPISEN) de lInstitut National Polytechnique Flix Houphout Boigny de Yamoussoukro Yamoussoukro Cte dIvoire

Rubber latex is an important economic resource. However, the residues from its harvesting are thrown away, even though they contain lipids that can be recycled. This recovery of the residues from the bottom of the cup requires first and foremost their characterization. The aim of this study is therefore to determine the main physical and chemical characteristics of rubber latex cup bottom oil. Oil’s physical parameters determination shows that it has a density of 951 kg∙m−3, a kinematic viscosity of 48.57 cSt and a water content of 0.0845%. Chemical parameters, meanwhile, indicate that this cup bottom residue has a fat content of 95.96%, an acid number of 2.805 mg KOH/g and an iodine number of 92.42 g I2/100g. Therefore, rubber latex cup bottom oil can be used in the formulation of biofuels, biolubricants, paints, varnishes, alkyd resins, polishing oils, soaps, and insecticides.

关键词： Rubber Latex Cup Bottoms Oil Density Viscosity Characterizations

Production of Yam Tubers Using Seed Tubers from Vitroplants Regenerated from Aerial Stems in the Yam Species Dioscorea alata (L.) and Dioscorea cayenensis-rotundata (L. & P.) in Côte d’Ivoire

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Advances in Bioscience and Biotechnology 2024年第3期15卷 184-194页

作者： Koffi Honoré Kouamé Kouakou Marius konan Kouadio Ignace kouassi Kouablan edmond Koffi Assanvo Simon-Pierre N’Guetta Department of des Science and Technology University Alassane Ouattara of Bouaké Bouaké C&#244te d’Ivoire Plant Production Research Unit Department of Natural Sciences University Nangui Abrogoua Abidjan C&#244te d’Ivoire Central Biotechnology Laboratory National Center for Agronomic Research (NCAR) Abidjan C&#244te d’Ivoire Genetics Laboratory of Bioscience Research Unit University Félix Houphou&#235t Boigny (UFHB) Abidjan C&#244te d’Ivoire

The aim of this study is to produce large quantities of yam tubers in the field from seed tubers derived from vitroplants regenerated from aerial stem cuttings and farmers’ tuber seeds. Seed tubers from ten yam cultivars, including five from Dioscorea alata (cDa083, cDa053, cDa115, cDa150 and cDa266) and five from Dioscorea cayenensis-rotundata (cDr015, cDr027, cDr150, cDr206 and cDr148) with distinct agro-morphological characteristics, were used as material. A completely randomized block design with 3 replications was used. In each block, all cultivars and seed types were represented. When put into cultivation, the tubers produced by the vitroplants all germinated and gave 100% healthy plants, compared with 86% to 100% healthy plants for the seed tubers produced by the farmers. Yields per hectare ranged from 10 to 25 tonnes for seed tubers produced by in vitro plants, and from 4 to 9 tons for seed tubers produced by farmers. Seed tubers from vitroplants can therefore be recommended to farmers as a solution to the problem of seed tuber unavailability.

关键词： Yams Vitroplants Seed Tubers Yields

Determination of a Numerical Analysis Algorithm for the Regulation of Blood Sugar in Diabetics

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Open Journal of Applied Sciences 2021年第8期11卷 908-928页

作者： Kolo Silue Hyacinthe kouassi konan Mamadou Coulibaly Olivier Asseu Laboratoire des Sciences et Technologies de l’Information et de la Communication (LASTIC) ESATIC Abidjan C&#244te d’Ivoire

Acceptable glycemic control when examining the effects of meals was achieved when combining basal insulin therapy and high concentration insulin injection before a meal, when using a PID controller (Proportionality, Integrity and Derivative actions) alone, when using a PID controller with basal insulin therapy and when combining the three methods of insulin delivery. Naturally, a type 1 diabetic must inject himself with insulin in well-measured doses. Thus, the management and control of diabetes become a complex task when one must be considered the disturbance due to nutrition and sports activity. This concern has been at the center of much research through different approaches through mathematical methods and Artificial Intelligence methods. This article simulates a physiological model of glycemic control in type 1 diabetics by a PID regulatory mechanism, in the context of disturbances caused by the patient’s meals and athletic activity.

关键词： System of Differential Equation Solving Algorithm Physiological Model Simulation Glucose Concentrations Diabetic Disturbance Function PID Controller

Anesthesiological Management of Eclampsia in Tropical Africa: Experience of the University Hospital Center of Bouake

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Open Journal of Anesthesiology 2018年第3期8卷 93-99页

作者： Kouadio konan Stéphanie Irié Bi Gohi Serge Pete Yaich Koffi N’Guessan Yao kouassi Christian Ogondon Bernard Nda-Koffi Cinthia Samake Yaya Kouame konan edmond Brouh Yapo Anesthesia-Intensive Care Unit Bouake Hospital Bouake Ivory Coast Pediatric Department Bouake Teaching Hospital Bouake Ivory Coast Obstetrics and Gynecology Department Bouake Teaching Hospital Bouake Ivory Coast

Introduction: Eclampsia is a common cause of maternal mortality in developing countries. The objective of this study is to evaluate the practice of anesthesia for eclampsia in tropical Africa. Patients and Methods: Retrospective descriptive study on the parturients who benefited from eclampsia anesthesia in the operating theaters of the gynecology and obstetrics department, the University Hospital Center (CHU) of Bouake over a two-year period (January 2015 to December 2016). The parameters studied were: anesthetic risk assessment, anesthetic management, immediate anesthetic and post-anesthetic accidents and incidents. Results: Out of a total of 3831 emergency cesarean sections, 65 were for eclampsia, or 1.69% of obstetrical surgical activity. The mean age of the patients was 20.30 ± 3.34 years (range: 14 years and 39 years). Prenatal consultation was not performed in 70% of cases and 85% of patients were primiparous. Patients classified as ASA IIIU accounted for 75% of the population and in 62% of cases, the Glasgow score was between 9 and 12. Induction was achieved with thiopental in 98% of patients and vecuronium was the only muscle relaxant used. The most common fetal complications were hypotrophy (50%), prematurity (30%) and respiratory distress (40%). Postoperative anesthetic complications were agitation (70%) and wake delay (15%). Maternal mortality was 5% and the neonatal death rate was around 7.69%. The elements of poor maternal prognosis were the ASA IVU class (P = 0.015) and the Aldrete awakening score between 3 and 5 awakening (P = 0.001). Conclusion: Anesthesia for eclampsia at CHU of Bouake is difficult. It needs to be improved thanks to better equipment of the health structures.

关键词： Eclampsia Emergency Anesthesiology Ivory Coast