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1

A calculation model for liquid-liquid extraction of protactinium by 2,6-dimethyl-4-heptanol

100%

Knight A. W., Eitrheim E. S., Nelson A. W., Schultz M. K.

Nukleonika

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2015

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vol. 60

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issue 4

837-845

EN

Reprocessing of spent nuclear fuel usually employs the solvent extraction technique to recover fissile material, isolate other valuable radionuclides, recover precious metals, and remove contaminants. Efficient recovery of these species from highly radioactive solutions requires a detailed understanding of reaction conditions and metal speciation that leads to their isolation in pure forms. Due to the complex nature of these systems, identification of ideal reaction conditions for the efficient extraction of specific metals can be challenging. Thus, the development of experimental approaches that have the potential to reduce the number of experiments required to identify ideal conditions are desirable. In this study, a full-factorial experimental design was used to identify the main effects and variable interactions of three chemical parameters on the extraction of protactinium (Pa). Specifically we investigated the main effects of the anion concentration (NO3-, Cl-) extractant concentration, and solution acidity on the overall extraction of protactinium by 2,6-dimethyl-4-heptanol (diisobutylcarbinol; DIBC) from both HCl and HNO3 solutions. Our results indicate that in HCl, the extraction of protactinium was dominated by the solution acidity, while in nitric acid the extraction was strongly effected by the [DIBC]. Based on our results, a mathematical model was derived, that describes the relationship between concentrations of anions, extractant, and solution acidity and the expected values of Pa distribution coefficients in both HCl and HNO3. This study demonstrates the potential to predict the distribution coefficient values, based upon a mathematical model generated by a full-factorial experimental design.

2

Application of the design of experiments in the epoxidation process of 1,5,9-cyclododecatriene

100%

Lewandowski G., Ćwirko J.

Polish Journal of Chemical Technology

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2007

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vol. 9

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issue 4

68-71

EN

An influence of the molar ratio of cis, trans, trans-1,5,9-cyclododecatriene to tert-butyl hydroperoxide, the concentration of the catalyst and the reaction time on the performance of the epoxidation process of cis, trans, trans-1,5,9-cyclodecatriene with tert-butyl hydroperoxide at the presence of molybdenum hexacarbonyl Mo(CO)6 was examined. Examinations were performed using statistical methods of the design of experiments. A mathematical model describing the influence of the parameters on conversion cis, trans, trans-1,5,9-cyclododecatriene was obtained. An analysis of the data and rests was performed and an optimal value of conversion of cis, trans, trans-1,5,9-cyclododecatriene was established.

3

Modeling of A Two Stages Electrostatic Air Precipitation Process using Response Surface Modeling

88%

Berrached D., Tilmatine A., Miloua F., Bengrit M.

Archives of Electrical Engineering

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2014

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vol. 63

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issue 4

4

Experimentation and Prediction of the Wear of a Cutting Tool in Turning Process

75%

Merzoug M., Benamara N., Boulenouar A., Bouchouicha B., Mazari M.

Archives of Metallurgy and Materials

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2018

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vol. 63

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issue 2

5

Optimization of the epoxidation process of (1Z,5E,9E)-1,5,9-cyclododecatriene to 1,2-epoxy-(5Z,9E)-5,9-cyclododecadiene withtert-buthyl hydroperoxide - the influence of technological parameters on the hydroperoxide conversion

75%

Lewandowski G., Rytwińska E., Milchert E.

Polish Journal of Chemical Technology

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2007

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vol. 9

|

issue 3

105-107

EN

The optimization studies of the epoxidation process of (1Z,5E,9E)-1,5,9-cyclododecatriene (CDT) with tert-buthyl hydroperoxide (TBHP) over the molybdenum catalyst Mo(CO)6 were performed. The reaction was examined in terms of a uniform-rotatable design. Three factors were analyzed: the reaction time, CDT:TBHP molar ratio, and the molar concentration of the catalyst (Mo(CO)6). According to the design 20 experiments were performed at the constant temperature of 70°C.

6

Modeling and Optimization of Phenol Formaldehyde Resin Sand Mould System

75%

Patel M. G. C., Parappagoudar M. B., Chate G. R., Deshpande A. S.

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issue 2

7

Comparative Studies of Electrospinning and Solution Blow Spinning Processes for the Production of Nanofibrous Poly(L-Lactic Acid) Materials for Biomedical Engineering

75%

Wojasiński M., Pilarek M., Ciach T.

Polish Journal of Chemical Technology

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2014

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vol. 16

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issue 2

43-50

EN

Comparative statistical analysis of the infiuence of processing parameters, for electrospinning (ES) and solution blow spinning (SBS) processes, on nanofibrous poly(L-lactic acid) (PLLA) material morphology and average fiber diameter was conducted in order to identify the key processing parameter for tailoring the product properties. Further, a comparative preliminary biocompatibility evaluation was performed. Based on Design of Experiment (DOE) principles, analysis of standard effects of voltage, air pressure, solution feed rate and concentration, on nanofibers average diameter was performed with the Pareto’s charts and the best fitted surface charts. Nanofibers were analyzed by scanning electron microscopy (SEM). The preliminary biocompatibility comparative tests were performed based on SEM microphotographs of CP5 cells cultured on materials derived from ES and SBS. Polymer solution concentration was identified as the key parameter infiuencing morphology and dimensions of nanofibrous mat produced from both techniques. In both cases, when polymer concentration increases the average fiber diameter increase. The preliminary biocompatibility test suggests that nanofibers produced by ES as well as SBS are suitable as the biomedical engineering scaffold material.

8

Uncommon applications of statistical methods of the design of experiments in chemical technology and environment protection

75%

Lewandowski G., Ćwirko J.

Polish Journal of Chemical Technology

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2007

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vol. 9

|

issue 4

63-67

EN

The review of literature related to the applications of statistic methods of design of experiments in chemical technology and environment protection was presented in the work. The research that consists of two stages: a stage of choosing the best variables describing an experimental object and a stage of proper experimental investigation, seems particularly interesting.An interesting example of an application of statistical strategies in environmental protection is the optimization of photoactivity of TiO2/SiO2 mixture, received by a sol-gel technique. TiO2, due to its specific feature, was applied in the photocatalytic methods of removing toxic compounds from water and air. In the experiments there were used two designs - the fractional factorial design 25-1 (as the elimination one) and the central composite design (as the proper one). Following the data analysis from the elimination plan two variables were eliminated, which helped to simplify the research object.Among other uncommon applications of the design of experiments: the optimization of the conditions for the extraction of natural pigments used in dyeing food, the production of fatty acid methyl esters used as diesel oil substitutes (biodiesel) and the optimization of a supercritical fluid extraction methodology for the analysis of castor oil, should be mentioned.

9

The Impact of Laser Processing Parameters on the Properties of Electro-Spark Deposited Coatings

75%

Radek N., Szczotok A., Gądek-Moszczak A., Dwornicka R., Bronček J., Pietraszek J.

Archives of Metallurgy and Materials

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2018

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vol. 63

|

issue 2

Refine search results

A calculation model for liquid-liquid extraction of protactinium by 2,6-dimethyl-4-heptanol

Application of the design of experiments in the epoxidation process of 1,5,9-cyclododecatriene

Modeling of A Two Stages Electrostatic Air Precipitation Process using Response Surface Modeling

Experimentation and Prediction of the Wear of a Cutting Tool in Turning Process

Optimization of the epoxidation process of (1Z,5E,9E)-1,5,9-cyclododecatriene to 1,2-epoxy-(5Z,9E)-5,9-cyclododecadiene withtert-buthyl hydroperoxide - the influence of technological parameters on the hydroperoxide conversion

Modeling and Optimization of Phenol Formaldehyde Resin Sand Mould System

Comparative Studies of Electrospinning and Solution Blow Spinning Processes for the Production of Nanofibrous Poly(L-Lactic Acid) Materials for Biomedical Engineering

Uncommon applications of statistical methods of the design of experiments in chemical technology and environment protection

The Impact of Laser Processing Parameters on the Properties of Electro-Spark Deposited Coatings