scholarly journals Ion Exchange Dialysis for Aluminium Transport through a Face-Centred Central Composite Design Approach

Processes ◽  
2020 ◽  
Vol 8 (2) ◽  
pp. 160 ◽  
Author(s):  
Dennis Asante-Sackey ◽  
Sudesh Rathilal ◽  
Lingham V. Pillay ◽  
Emmanuel Kweinor Tetteh
Keyword(s):  
Ion Exchange ◽  
Central Composite Design ◽  
Desirability Function ◽  
Target Response ◽  
Time Zone ◽  
Feed Concentration ◽  
Counter Flow ◽  
The Face ◽  
Desirability Approach ◽  
Central Composite

An ion exchange dialysis (IED) is used in the recovery of aluminium from residue. In this paper, the face-centred central composite design (FC-CCD) of the response surface methodology (RSM) and desirability approach is used for experimental design, modelling and process optimization of a counter flow IED system. The feed concentration, feed flowrate, sweep flowrate and sweep concentration were selected as the process variables, with the Al transport across a Nafion 117 membrane as the target response. A total of 30 experimental runs were conducted with six centre points. The response obtained was analysed by analysis of variance (ANOVA) and fitted to a second-order polynomial model using multiple regression analysis. The actual R2 and standard deviation of the model are 0.9548 and 0.2932, respectively. Depending on the time zone of reference (24 h or 32 h), the highest enrichment of >1.50 was achieved. The designed variables were numerically optimized by applying the desirability function to achieve the maximum Al transport. The optimised condition values were found to be a feed concentration of 1600 ppm, feed flowrate of 61.76%, sweep flowrate of 37.50% and sweep concentration of 0.75 N for the 80% target response at 32 h. Overall, the model can be used to effectively predict Al recovery using the designed system.

scholarly journals Ion Exchange Dialysis for Aluminium Transport through a Face Centered Central Composite Design Approach

2019 ◽  
Author(s):  
Dennis Asante-Sackey ◽  
Sudeh Rathilal ◽  
Lingham V. Pillay ◽  
Emmanuel Kweinor Tetteh
Keyword(s):  
Ion Exchange ◽  
Central Composite Design ◽  
Desirability Function ◽  
Target Response ◽  
Feed Concentration ◽  
The Face ◽  
Contour Plots ◽  
Desirability Approach ◽  
Face Centered ◽  
Central Composite

An ion exchange dialysis (IED) is used in the recovery of aluminium from residue. In this papers, the face-centered central composite design (FC-CCD) of the response surface methodology (RSM) and desirability approach is used for experimental design, modelling and process optimization of a counter flow IED system. The feed concentration, feed flowrate, sweep flowrate and sweep concentration are selected as the process variables, with the Al-transport across a Nafion 117 membrane as the target response. A total of 30 experimental runs were conducted with 6 center points. The response obtained was analysed by analysis of variance (ANOVA) and fitted to a second-order polynomial model using multiple regression analysis. The actual R2 and standard deviation of the model are 0.9548 and 0.2932 respectively. The influences of significant variables are plotted on 3D surface and contour plots. The designed variables were numerically optimized by applying the desirability function to achieve the maximum Al-transport. The optimised condition values were found to be feed concentration (1600 ppm), feed flowrate (61.76%), sweep flowrate (37.50%) and sweep concentration (0.75 N) for the 80% target response at 32hrs. Overall, the model can be used to effectively predict Al-recovery using the designed system

scholarly journals Effect of ion exchange dialysis process variables on aluminium permeation using response surface methodology

2019 ◽  
Vol 25 (5) ◽  
pp. 714-721
Author(s):  
Dennis Asante-Sackey ◽  
Sudesh Rathilal ◽  
V.L Pillay ◽  
Emmanuel Kweinor Tetteh
Keyword(s):  
Response Surface Methodology ◽  
Ion Exchange ◽  
Response Surface ◽  
Flow Rate ◽  
Statistical Experimental Design ◽  
Feed Concentration ◽  
Counter Flow ◽  
Face Centered ◽  
Rsm Model ◽  
Central Composite

This study investigated aluminum permeation using a counter flow ion exchange dialysis (IED) system. The optimum conditions for permeation were investigated using response surface methodology (RSM). Effect of four factors- feed concentration (100-2,000 ppm, A), feed flow rate (25-85%, B), sweep concentration (0.25-1 N HCl, C) and sweep flow rate (25-85%, D) were studied using face centered central composite (FC-CCD) statistical experimental design. A RSM model was developed based on the experimental permeation data and the response plot was developed. The FC-CCD model predicted permeation correlated with the experimental data. The regression coefficient (R<sup>2</sup>) was found to be 0.9568. The experiment showed the ascending order of the effect of the variables is D < B < C < A. In a counter flow IED for Al permeation, the sweep flow rate is insignificant (p > 0.05). Experimental validation demonstrated for target permeation of 70% was 68.8% ± 2.22%. This suggested that the RSM was a suitable tool in optimizing Al-permeation.

scholarly journals Optimized green extraction conditions of matcha green tea (Camellia sinensis) using central composite design for maximal polyphenol and antioxidant contents

BioResources ◽  
2021 ◽  
Vol 16 (2) ◽  
pp. 3255-3271
Author(s):  
Nor Hafiza Sayuti ◽  
Ammar Akram Kamarudin ◽  
Norazalina Saad ◽  
Nor Asma Ab. Razak ◽  
Norhaizan Mohd Esa
Keyword(s):  
Central Composite Design ◽  
Green Tea ◽  
Camellia Sinensis ◽  
Desirability Function ◽  
Radical Scavenging ◽  
Antioxidant Compounds ◽  
Green Extraction ◽  
Antioxidant Content ◽  
Optimum Extraction ◽  
Central Composite

Response surface methodology (RSM) was employed to optimize the extraction conditions of phenolic and antioxidant compounds from matcha green tea (Camellia sinensis) using central composite design (CCD). The desirability function was used to find the optimum extraction conditions. The highest polyphenol and antioxidant content yield were reached at a temperature of 80 °C, an extraction time of 20 min, a liquid-to-solid ratio of 100 mL/g, and a desirability value of 0.948. The experimental values for total phenolics under the optimum extraction conditions were 317.62 ± 3.45 mg GAE/g and 29.21 ± 0.38 mg RE/g for the total flavonoids. The antioxidant activity (AA) was evaluated using 2,2 diphenyl-1-picrylhydrazyl (DPPH) and 2,2-azinobis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS), which showed radical scavenging activities at 88.28 ± 0.14% and 90.02 ± 0.14%, respectively. The high performance liquid chromatography (HPLC) analysis at the optimum condition revealed 14 compounds. Among the analyzed compounds, matcha green tea extract (MGTE) had the highest content of epigallocatechin gallate (EGCG) with 95.48 mg/g, followed by epicatechin gallate (ECG) at 74.48 mg/g, and catechin at 28.94 mg/g. The results suggested that the optimized parameters of heat-assisted extraction provide an ideal green extraction method for the extraction of the high polyphenol and antioxidant content in matcha green tea.

scholarly journals Process variable optimization in the cold metal transfer weld repair of aerospace ZE41A-T5 alloy using central composite design

2019 ◽  
Vol 105 (11) ◽  
pp. 4827-4835 ◽  
Author(s):  
O. T. Ola ◽  
R. L. Valdez ◽  
K. M. Oluwasegun ◽  
O. A. Ojo ◽  
K. Chan ◽  
...  
Keyword(s):  
Central Composite Design ◽  
Desirability Function ◽  
Welding Process ◽  
Metal Transfer ◽  
Fusion Welding ◽  
Complete Fusion ◽  
Cold Metal Transfer ◽  
Cold Metal ◽  
Application Specific ◽  
Central Composite

AbstractThe pulsed cold metal transfer (CMT+P) process was evaluated for the repair of aerospace structural components made from ZE41A-T5 magnesium alloy. The choice of welding variables was considered to be unique for the material type, weld design and geometry, and application-specific requirements. A design of experiment (DOE) method based on a rotatable 3D central composite design (CCD) was used to systematically establish relationships between independent welding variables and the resultant output variables of the CMT+P process, including the development of mathematical models based on second-order polynomial. A multiple response desirability function approach was then used for process optimization. The CMT+P process produced high-quality welds in the alloy. Welding process variables were established to produce desired weld penetration and weld reinforcement and complete fusion with minimal weld defects. Optimal domains of the independent variables were achieved; where the welds comply with the application-specific (repair of gearbox housing) requirements and acceptable class A weld quality of the aerospace fusion welding standard AWS D17.1.

scholarly journals Alternative Second-Order N-Point Spherical Response Surface Methodology Design and Their Efficiencies

2016 ◽  
Vol 5 (4) ◽  
pp. 22
Author(s):  
Mary Paschal Iwundu
Keyword(s):  
Response Surface Methodology ◽  
Central Composite Design ◽  
Response Surface ◽  
Second Order ◽  
The Face ◽  
Central Composite Designs ◽  
Face Centered ◽  
Composite Designs ◽  
Central Composite ◽  
Exact Designs

The equiradial designs are studied as alternative second-order N-point spherical Response Surface Methodology designs in two variables, for design radius ρ = 1.0. These designs are seen comparable with the standard second-order response surface methodology designs, namely the Central Composite Designs. The D-efficiencies of the equiradial designs are evaluated with respect to the spherical Central Composite Designs. Furthermore, D-efficiencies of the equiradial designs are evaluated with respect to the D-optimal exact designs defined on the design regions of the Circumscribed Central Composite Design, the Inscribed Central Composite Design and the Face-centered Central Composite Design. The D-efficiency values reveal that the alternative second-order N-point spherical equiradial designs are better than the Inscribed Central Composite Design though inferior to the Circumscribed Central Composite Design with efficiency values less than 50% in all cases studied. Also, D-efficiency values reveal that the alternative second-order N-point spherical equiradial designs are better than the N-point D-optimal exact designs defined on the design region supported by the design points of the Inscribed Central Composite Design. However, the N-point spherical equiradial designs are inferior to the N-point D-optimal exact designs defined on the design region supported by the design points of the Circumscribed Central Composite Design and those of the Face-centered Central Composite Design, with worse cases with respect to the design region of the Circumscribed Central Composite Design.

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