Computational simulation applied to improve fuel bioethanol distillation

2013 ◽  
pp. 645-650
Author(s):  
Fabio R.M. Batista ◽  
Antonio J.A. Meirelles
Keyword(s):  
Experimental Validation ◽  
Computational Simulation ◽  
Industrial Plant ◽  
Careful Study ◽  
Optimal Conditions ◽  
Liquid Equilibrium ◽  
Steam Consumption ◽  
Wine Composition ◽  
Standard Solution ◽  
Central Composite

Experimental validation of the process simulation a typical industrial bioethanol unit was conducted, comparing the obtained results with the information collected in an industrial plant. A standard solution containing water, ethanol and 17 congeners was chosen to represent the fermented must, whose composition was selected according to analyses of samples of industrial wines. A careful study of the vapour-liquid equilibrium of the wine components was performed. An attempt to optimise the industrial plant was conducted considering two optimising approaches: the central composite design (CCD) and the Sequential Quadratic Programming (SQP). The process was investigated in terms of bioethanol alcoholic graduation, ethanol recovery, energy consumption and ethanol loss. The results showed that the simulation approach was capable of correctly reproducing a real plant of bioethanol distillation and that the optimal conditions are slightly different from those used at the industrial plant investigated. Substantial fluctuations in wine composition were easily controlled for the two loop controls preventing an off-specification product. The optimised conditions indicate a distillation process able to produce bioethanol according to the legislation requirements and with appropriate steam consumption and loss of ethanol. However, for the production of alcohols with superior qualities, substantial changes in the production system may be required.

Modeling of supercritical fluid extraction of flavonoids from Calycopteris floribunda leaves

2014 ◽  
Vol 68 (3) ◽  
Author(s):  
Xiong Liu ◽  
Dong-Liang Yang ◽  
Jia-Jia Liu ◽  
Kuan Xu ◽  
Guo-Hui Wu
Keyword(s):  
Supercritical Fluid Extraction ◽  
Supercritical Fluid ◽  
Extraction Process ◽  
Optimal Conditions ◽  
Fluid Extraction ◽  
Pressure Method ◽  
Organic Solvent Extraction ◽  
Drug Lead ◽  
Temperature And Pressure ◽  
Central Composite

AbstractThe aim of this study was to obtain flavonoids extracts from Calycopteris floribunda leaves using supercritical fluid extraction (SFE) with CO2 and a co-solvent. Pachypodol, a potential anticancer drug lead compound separated from the extracts, was examined. Classical organic solvent extraction (CE) with ethanol was performed to evaluate the high pressure method. HPLC analysis was introduced to interpret the differences between SFE and CE extracts in terms of antioxidant activity and the concentration of pachypodol. SFE kinetics and mathematical modeling of the overall extraction curves (OEC) were investigated. Evaluation of the models against experimental data showed that the Sovová model performs the best. The supercritical fluid extraction process was optimized using a central composite design (CCD), where temperature and pressure were adjusted. The optimal conditions of SFE were: pressure of 30 MPa and temperature of 35°C.

scholarly journals OPTIMIZING THE PROCESS OF TRANSFORMING COFFEE HUSKS INTO BIOCHAR BY MEANS OF HYDROTHERMAL CARBONIZATION

2018 ◽  
Vol 54 (4B) ◽  
pp. 138
Author(s):  
Tran Thi Hien
Keyword(s):  
Maximum Yield ◽  
Hydrothermal Carbonization ◽  
Optimal Conditions ◽  
Coffee Husk ◽  
Optimal Value ◽  
Face Centered ◽  
Composite Face ◽  
Temperature Time ◽  
Central Composite ◽  
Water Ratio

The conditions of the hydrothermal carbonization process to produce biochar from coffee husk will be optimized for maximum yield. Besides, response surface methodology (RSM) and central composite face-centered (CCF) method will be used in designing experiments. Also, the optimal value of factors such as temperature, time and biomass: water ratio which can provide a maximum yield of biochar will be worked out using Modde 5.0. As a result, the optimal conditions for maximum yield of biochar was obtained as temperature of 180 oC, 3.5 h and biomass: water ratio of 15 %. It can also be concluded that temperature has greater impact on the transformation of biochar than time and biomass: water ratio.

scholarly journals Pineapple Bark Performance in Dyes Adsorption: Optimization by the Central Composite Design

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Ahlam Fegousse ◽  
Abdelali El Gaidoumi ◽  
Youssef Miyah ◽  
Rabea El Mountassir ◽  
Anissa Lahrichi
Keyword(s):  
Central Composite Design ◽  
Design Methodology ◽  
Brilliant Green ◽  
Optimal Conditions ◽  
Initial Concentration ◽  
Dyes Adsorption ◽  
Experimental Design Methodology ◽  
Central Composite ◽  
Adsorbent Dose ◽  
Scanning Electron

This work is concerned with the study of the adsorption in aqueous medium of a three-dye mixture which contains Methylene Blue, Brilliant Green, and Congo Red on the pineapple bark. This adsorbent material has been characterized by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). The experimental design methodology, based on the response surface methodology (RSM) by the central composite design (CCD), has been applied for the optimization of the parameters, namely, the temperature, dose of the adsorbent, and pH. The yield reached 98.91% under optimal conditions (T = 30°C; adsorbent dose = 2.5 g·L−1; pH = 9.8) at an initial concentration of 20 mg·L−1.

scholarly journals Statistical Optimization of Operational Parameters for Enhanced Naphthalene Degradation by Photocatalyst

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Aijuan Zhou ◽  
Jing Peng ◽  
Zhaobo Chen ◽  
Jingwen Du ◽  
Zechong Guo ◽  
...  
Keyword(s):  
Degradation Rate ◽  
Design Method ◽  
Irradiation Time ◽  
Catalyst Loading ◽  
Statistical Experimental Design ◽  
Optimal Conditions ◽  
Operational Parameters ◽  
Excellent Correlation ◽  
Naphthalene Degradation ◽  
Central Composite

The optimization of operational parameters for enhanced naphthalene degradation by TiO2/Fe3O4-SiO2(TFS) photocatalyst was conducted using statistical experimental design and analysis. Central composite design method of response surface methodology (RSM) was adopted to investigate the optimum value of the selected factors for achieving maximum naphthalene degradation. Experimental results showed that irradiation time, pH, and TFS photocatalyst loading had significant influence on naphthalene degradation and the maximum degradation rate of 97.39% was predicted when the operational parameters were irradiation time 97.1 min, pH 2.1, and catalyst loading 0.962 g/L, respectively. The results were further verified by repeated experiments under optimal conditions. The excellent correlation between predicted and measured values further confirmed the validity and practicability of this statistical optimum strategy.

scholarly journals Optimization of nitrogen source for Bifidobacterium bifidum using response surface methodology

2016 ◽  
Vol 20 (1) ◽  
pp. 53-64 ◽  
Author(s):  
He Chen ◽  
Jianbo Kou ◽  
Man Hu ◽  
Guowei Shu
Keyword(s):  
Response Surface Methodology ◽  
Carbon Source ◽  
Central Composite Design ◽  
Liquid Medium ◽  
Nitrogen Source ◽  
Bifidobacterium Bifidum ◽  
Optimal Conditions ◽  
Medium Carbon ◽  
Central Composite ◽  
Mrs Medium

Abstract In order to improve the viable counts of Bifidobacterium bifidum BB01 in the liquid medium, the Central Composite Design (CCD) was used to optimize the nitrogen source in the medium of B. bifidum BB01. The results showed that the nitrogen source composition of B. bifidum BB01 was: peptone 0.9%, yeast extracts 0.3%, beef paste 0.7%. Under the optimal conditions, the viable counts of B. bifidum BB01 reached (2.49±0.06)×109CFU/mL after cultured at 18h, which was 42.97% higher than MRS (lactose), and 12.85% higher than the optimized MRS medium (carbon source and prebiotics were optimized). Therefore, the CCD used in this study is workable for promoting the growth of B. bifidum BB01.

scholarly journals An Efficient Ionic Liquid-Mediated Extraction and Enrichment of Isoimperatorin from Ostericum koreanum (Max.) Kitagawa

Molecules ◽  
2021 ◽  
Vol 26 (21) ◽  
pp. 6555
Author(s):  
Alice Nguvoko Kiyonga ◽  
Gyu Hwan Park ◽  
Hyun Su Kim ◽  
Young-Ger Suh ◽  
Tae Kon Kim ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Crystallization Process ◽  
Raw Material ◽  
Optimal Conditions ◽  
Volatile Organic ◽  
Significant Interest ◽  
Ostericum Koreanum ◽  
One Step ◽  
Central Composite ◽  
Step Crystallization

Ionic liquids (ILs) have attracted significant interest because of their desirable properties. These characteristics have improved their application to overcome the shortcomings of conventional separation techniques for phytochemicals. In this study, several ILs were investigated for their capacity to extract isoimperatorin, a bioactive furanocoumarin, from the roots of Ostericum koreanum. Herein, 1-Butyl-3-methylimidazolium tetrafluoroborate ([Bmim][BF4]) was selected as a promising IL for separating isoimperatorin. A central composite design was applied to optimize the extraction conditions. Under the optimal conditions, the yield of isoimperatorin reached 97.17 ± 1.84%. Additionally, the recovery of isoimperatorin from the [Bmim][BF4] solution was successfully achieved (87.73 ± 2.37%) by crystallization using water as an antisolvent. The purity of the isoimperatorin was greatly enhanced, from 0.26 ± 0.28% in the raw material to 26.94 ± 1.26% in the product, in a one-step crystallization process. Namely, an enhancement of approximately 103-folds was reached. The developed approach overcomes the shortcomings of conventional separation methods applied for gaining isoimperatorin by significantly reducing the laboriousness of the process and the consumption of volatile organic solvents. Moreover, the simplicity and effectiveness of the method are assumed to be valuable for producing isoimperatorin-enriched products and for promoting its purification. This work also confirms the efficiency of ILs as a promising material for the separation of phytochemicals.

scholarly journals Degradation of Oxytetracycline by Electrochemical, Fenton and Electro-fenton Processes Using SS316 and SS316/β-PbO2 Anodes: Process Optimization Using Rsm-ccd, Bioassay Test and Degradation Pathway

2021 ◽  
Author(s):  
Kamal Hasani ◽  
Sama Hosseini ◽  
Heliya Gholizadeh ◽  
Abdollah Dargahi ◽  
Mehdi Vosoughi
Keyword(s):  
Degradation Pathway ◽  
Electrochemical Process ◽  
Fenton Process ◽  
Optimal Conditions ◽  
Optimal Value ◽  
Anode Electrode ◽  
Optimal Values ◽  
Electrochemical Fenton ◽  
And Staphylococcus Aureus ◽  
Central Composite

Abstract The aim of the present study was to evaluate the efficiency of advanced oxidation processes (electrochemical, Fenton and electro-Fenton) in the removal of oxytetracycline using SS316 and SS316/β-PbO2 anodes. This study was performed experimentally on a laboratory scale in a 250 mL reactor. First, experiments were designed for the electrochemical process using a central composite design, and the optimal conditions for the variables pH(3.53), electric current density(3.85mA/cm2), initial concentration of oxytetracycline (20mg/L) and electrolysis time (42.35min) was obtained; then, under these conditions, the efficiency of Fenton process with FeSO4 variable without the presence of electrodes was evaluated, and its optimal value was 0.3 g/L, and then in the presence of optimal values ​​of the above 5 variables, the efficiency of electro-Fenton process with H2O2 changes were investigated and the optimal value of 0.12 was obtained for H2O2. The removal efficiencies of oxytetracycline in electrochemical, Fenton, and electro-Fenton processes were 84.7%, 73.4%, and 98.2%, respectively. Under optimal conditions, the SS316/β-PbO2 anode electrode enhanced the oxytetracycline efficiency by electron-Fenton process to 100%. The results of bioassay with microorganisms showed that the reduction of toxicity of the effluent treated by electro-Fenton process for Pseudomonas aeruginosa and Staphylococcus aureus was 84.5% and 69%, respectively.

scholarly journals The Brazilian Way to Consume acai: Do guarana Extract and Sugar Concentrations Influence on Acceptance?

2013 ◽  
Vol 3 (1) ◽  
pp. 39
Author(s):  
Gabriela Montenegro ◽  
Karen S. Pereira ◽  
Lauro Melo
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Critical Value ◽  
Consumer Acceptance ◽  
Central Composite Rotatable Design ◽  
Optimal Conditions ◽  
F Test ◽  
Sensory Acceptance ◽  
Amazon Estuary ◽  
Central Composite

<p class="Normal1"><em>A</em><em>c</em><em>a</em><em>i</em> is a palm widely distributed in the Amazon estuary floodplains. The edible pulp of acai fruits is commonly macerated with water to produce a thick, purple beverage of creamy texture, oily appearance, and characteristic flavor. Depending on the Brazilian region, the acai based-product is prepared adding sugar and <em>guaran</em><em>a</em> extract, but their ideal proportions have never been determined in order to optimize consumers’ sensory acceptance. This research investigated these concentrations using response surface methodology (RSM) based on a five-level, two variable central composite rotatable design (CCRD). Dependent variable was consumer acceptance (flavor, texture and overall liking) and results were analyzed by multivariate regressions. Analyses of Variance (ANOVAs) showed significant models – F-test values (29.3 for flavor, for texture 37.8 and 30.4 for overall liking) higher than the critical value of 4.35 (d.f. = 3; p &lt; 0.05; R<sup>2</sup> of 0.926 for flavor, 0.942 for texture and 0.929 for overall liking). Acceptance models are presented (significant parameters). Results showed that guarana extract has a stronger influence (negative) on acceptance compared to sugar (positive), both not on optimal conditions yet. Therefore, more studies are needed in order to optimize acai acceptance.</p>

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