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    Wyświetlanie 1-11 z 11
    Tytuł:
    Optimization of production process of epoxidized soybean oil with high oxygen content through response surface methodology
    Autorzy:
    Zhang, Fengyan
    Dong, Yonglu
    Lin, Sudong
    Gui, Xuefeng
    Hu, Jiwen
    Powiązania:
    https://bibliotekanauki.pl/articles/27315650.pdf
    Data publikacji:
    2023
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    soybean oil
    response surface methodology
    epoxidation
    oxirane value
    Opis:
    The epoxidation process of soybean oil (SBO) and peracid produced by 50 wt% hydrogen peroxide (H2O2) and formic acid (FA) was studied with sulfuric acid (H2SO4) as a catalyst. Three reaction parameters, including reaction temperature, FA-to-SBO ratio, and H2O2-to-SBO ratio, were investigated, along with the combined effect on oxirane value (OV). Based on response surface methodology (RSM), the Box-Behnken design (BBD) was used to optimize the process parameters. According to the results, the calculated OV (7.34%) and the experimental OV (7.31%) were significantly in agreement. The product was con firmed as epoxidized soybean oil (ESO) by IR and NMR characterization methods. These results demonstrated the reliability of RSM to optimize the SBO reaction to produce ESO with high oxygen content.
    Źródło:
    Polish Journal of Chemical Technology; 2023, 25, 2; 21--29
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of Response Surface Methodology for Optimization of Permeabilization Process of Baker’s Yeast
    Autorzy:
    Trawczyńska, I.
    Wójcik, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/778342.pdf
    Data publikacji:
    2014
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    permeabilization
    baker's yeast
    response surface methodology
    isopropyl alcohol
    Opis:
    Permeabilization was used for the purpose of transforming the cells of microorganisms into biocatalysts with an enhanced enzyme activity. Baker’s yeast cells were permeabilized with various organic solvents. A high degree of catalase activity was observed upon permeabilization with acetone, chloroform, isopropyl alcohol and ethyl acetate. Response surface methodology was used to model the effect of concentration of isopropyl alcohol, temperature and treatment time on the permeabilization of baker’s yeast cells to maximize the decomposition of H2O2. The optimum operating conditions for permeabilization were observed at 53.7% concentration of isopropyl alcohol, treatment time of 40 min and temperature of 15.6oC. A maximum value of catalase activity was found to be 6.188 U/g wet wt. and was ca. 60 times higher than the catalytic activity of yeast not treated by the permeabilization process.
    Źródło:
    Polish Journal of Chemical Technology; 2014, 16, 2; 31-35
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Removal of benzotriazole by Photo-Fenton like process using nano zero-valent iron: response surface methodology with a Box-Behnken design
    Autorzy:
    Ahmadi, M.
    Rahmani, K.
    Rahmani, A.
    Rahmani, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/779500.pdf
    Data publikacji:
    2017
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    benzotriazole
    Photo-Fenton
    Response surface methodology
    Box-Behnken
    Opis:
    In this paper, the removal of benzotriazole (BTA) was investigated by a Photo-Fenton process using nano zero valent iron (NZVI) and optimization by response surface methodology based on Box-Behnken method. Effect of operating parameters affecting removal efficiency such as H2O2, NZVI, and BTA concentrations as well as pH was studied. All the experiments were performed in the presence of ultraviolet radiation. Predicted levels and BTA removal were found to be in good agreement with the experimental levels (R2 = 0. 9500). The optimal parameters were determined at 60 min reaction time, 15 mg L-1 BTA, 0.10 g L-1 NZVI, and 1.5 mmol L-1 H2O2  for Photo-Fenton-like reaction. NZVI was characterized using X-ray diffraction (XRD), transmission electron microscope (TEM) images, and scanning electron microscope (SEM) analysis.
    Źródło:
    Polish Journal of Chemical Technology; 2017, 19, 1; 104-112
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enzymatic extraction of potato starch: A parametric optimization study using response surface methodology
    Autorzy:
    Hameed, Madsar
    Ahmad, Syed W.
    Ahmad, Sajjad
    Qutab, Haji G.
    Dasih, Muhammad
    Imran, Muhammad
    Powiązania:
    https://bibliotekanauki.pl/articles/779788.pdf
    Data publikacji:
    2020
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    Response Surface methodology (RSM)
    Potato
    Starc
    Optimisation
    Extraction Parameters
    Opis:
    Optimized, effective and efficient methodology has been determined in this research work for the recovery of starch from potatoes. Potato starch extraction experimental results have been utilized for the parametric optimization study by using different statistical techniques. In this research work, starch extraction was conducted by employing cellulase enzyme. Response surface methodology (RSM) was put to use to perform statistical analysis to get optimum results. Five-level central composite design (CCD) consisting of three parameters was implemented to investigate the effect of enzyme concentration, contact time and broth dilution. Experiment results revealed that increment in enzyme concentration and contact time enhanced the starch recovery while dilution showed the inverse relation on the recovery of starch. Optimum starch recovery was achieved upto 89% when enzyme concentration (0.5 g/100 g) of potato meal was diluted with 10 mL of water and mixed for 4 h at 45°C.
    Źródło:
    Polish Journal of Chemical Technology; 2020, 22, 3; 48-54
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Parametric optimization of coal desulfurization through Alkaline leaching
    Autorzy:
    Rehman, F.
    Ahmad, S. W.
    Zafar, M. S.
    Ahmad, S.
    Zia-Ul-Haq, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/779964.pdf
    Data publikacji:
    2018
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    Desulfurization
    Alkaline leaching
    Response surface methodology
    ANOVA
    Central Composite design
    Opis:
    Desulfurization of Pakistani coal has been carried out through alkaline leaching. During present experimental investigation, the effect of operating parameters like alkali concentration, time, temperature and particle size has also been analyzed, graphically represented and critically discussed. Parametric optimization of leaching process has been carried out by using response surface methodology (RSM) based on central composite design (CCD). The analysis of variance (ANOVA) was performed in order to assess the highest level interactions of variables and three way interactions were observed significant. Further, the optimum value of total sulfur removal was observed as 53% when the operatic conditions fixed at 10% W/V, 60 min, 80°C and 140 mesh for alkaline concentration, leaching time, temperature and particle size, respectively.
    Źródło:
    Polish Journal of Chemical Technology; 2018, 20, 3; 103-109
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Parametric optimization of rice bran oil extraction using response surface methodology
    Autorzy:
    Ahmad, S. W.
    Javed, F.
    Ahmad, S.
    Akram, M.
    Rehman, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/778979.pdf
    Data publikacji:
    2016
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    solvent extraction
    rice bran oil
    response surface methodology (RSM)
    central composite design (CCD)
    Opis:
    Use of bran oil in various edible and nonedible industries is very common. In this research work, efficient and optimized methodology for the recovery of rice bran oil has been investigated. The present statistical study includes parametric optimization, based on experimental results of rice bran oil extraction. In this study, three solvents, acetone, ethanol and solvent mixture (SM) [acetone: ethanol (1:1 v/v)] were employed in extraction investigations. Response surface methodology (RSM), an optimization technique, was exploited for this purpose. A five level central composite design (CCD) consisting four operating parameter, like temperature, stirring rate, solvent-bran ratio and contact time were examined to optimize rice bran oil extraction. Experimental results showed that oil recovery can be enhanced from 71% to 82% when temperature, solvent-bran ratio, stirring rate and contact time were kept at 55°C, 6:1, 180 rpm and 45 minutes, respectively while fixing the pH of the mixture at 7.1.
    Źródło:
    Polish Journal of Chemical Technology; 2016, 18, 3; 103-109
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multi-variant Sorption Optimization for the Uptake Of Pb(II) Ions by Jamun Seed Waste
    Autorzy:
    Siyal, A.N.
    Memon, S.Q.
    Amanullah, M.
    Pirzada, T.
    Parveen, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/779346.pdf
    Data publikacji:
    2013
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    optimization
    Pb(II) ions removal
    Jamun seed waste
    response surface methodology
    Factorial Design Approach
    Opis:
    In the present study, jamun seed waste has been explored for the removal of Pb(II) ions from aqueous solution. The multi-variant sorption optimization was achieved by the factorial design approach. 99.91% of Pb(II) ions was removed from aqueous solution. The results predicted by the model were in good agreement with the experimental results (the values of R2 and R2 adj. were found to be 99.89% and 99.95%, respectively). Langmuir and D-R isotherm studies were carried out to fi nd adsorbent's capacities (183.9 š 0.31 mg/g and 184.5 š 0.16 mg/g respectively), sorption free energy 13.17 š 0.16 and RL values in the range of 0.05-0.77, suggested the favorable chemical and/or ion exchange nature of the sorption process. The FT-IR study was carried out for unloaded and Pb(II) ions loaded jamun seed, indicated, Pb(II) ions associated with nitrogen and oxygen of jamun seed containing moieties during the adsorption process. The proposed method was successfully validated and applied for the treatment of Pb(II) ions contaminating drinking water.
    Źródło:
    Polish Journal of Chemical Technology; 2013, 15, 1; 15-21
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Novel Calix[4]arene network resin for Cr(VI) ions Remediation : A Response Surface Approach
    Autorzy:
    Siyal, A. N.
    Memon, S. Q.
    Powiązania:
    https://bibliotekanauki.pl/articles/779157.pdf
    Data publikacji:
    2012
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    modified amberlite XAD-2
    calixarene
    cavities
    network
    optimization
    remediation
    removal
    chromium
    response surface methodology
    factorial design
    isotherms
    Opis:
    Novel Calix[4]arene Netwok (NCN) resin has been synthesized using Amberlite XAD-2 as the starting material. Hydroxyl groups have been introduced onto the para position of alkylated phenyl ring of Amberlite XAD-2 followed by the condensation to NCN by reacting it with formaldehyde. The NCN resin has been used for the remediation of Cr(VI) contaminated water using factorial design approach. A face-centered Draper-Lin composite design predicted ~100% removal effi ciency at optimum variables (the initial concentration of Cr(VI) ion 10 mg/l sorbent dose 200 mg, agitation time 136 min and pH 2). The accuracy and the fi tting of the model were evaluated by ANOVA and R2 (0.9992) values. The 99.5% removal effi ciency has been achieved experimentally at the optimum values of the variables. The Langmuir and D-R isotherm models were applicable to the sorption data with the value of RL and the sorption free energy 0.0057-0.1 and 7.93 kJ/mol respectively, suggesting favorable and physical/ion-exchange nature of the sorption. The calculated sorption capacity was 176.1š2.4 mg/g. The recycling studies of NCN resin showed that the multiple use of resin is feasible. Effect of concomitants has also been studies and proposed method was applied successfully for removal (98.7%) of Cr (VI) from electroplating wastewater.
    Źródło:
    Polish Journal of Chemical Technology; 2012, 14, 3; 21-28
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of process parameters using response surface methodology for the removal of phenol by emulsion liquid membrane
    Autorzy:
    Balasubramanian, A.
    Venkatesan, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/778338.pdf
    Data publikacji:
    2012
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    emulsyjna membrana ciekła
    metodologia powierzchni odpowiedzi
    fenol
    środki powierzchniowo-czynne
    emulsion liquid membrane
    response surface methodology
    phenol
    surfactant
    Opis:
    Emulsion liquid membrane technique (ELM) was used for the extraction of phenol from synthetic and industrial effluents. In this study, the liquid membrane used for phenol removal was composed of kerosene as the solvent, Span-80 as the surfactant and Sodium hydroxide as an internal reagent. Statistical experimental design was applied for the optimization of process parameters for the removal of phenol by ELM. The effects of process parameters namely, Surfactant concentration, membrane or organic to internal phase ratio (M/I) and emulsion to an external phase ratio (E/E) on the removal of phenol were optimized using a response surface method. The optimum conditions for the extraction of phenol using Response surface methodology were: surfactant concentration - 4.1802%, M/I ratio: 0.9987(v/v), and E/E ratio: 0.4718 (v/v). Under the optimized condition the maximum phenol extraction was found to be 98.88% respectively.
    Źródło:
    Polish Journal of Chemical Technology; 2012, 14, 1; 46-49
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of central composite design for the optimization of photodestruction of a textile dye using UV/S2O82- process
    Autorzy:
    Khataee, A.R.
    Powiązania:
    https://bibliotekanauki.pl/articles/778871.pdf
    Data publikacji:
    2009
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    planowanie doświadczeń
    metodologia powierzchni odpowiedzi
    dekoloryzacja
    experimental design
    response surface methodology
    decolorization
    C. I. Basic Red 46
    K2S2O8
    Opis:
    The photooxidative destruction of C. I. Basic Red 46 (BR46) by UV/S2O82- process is presented. Central Composite Design (CCD) was employed to optimize the effects of operational parameters on the photooxidative destruction efficiency. The variables investigated were the initial dye and S2O82- concentrations, reaction time and distance of the solution from UV lamp. The predicted values of the photodestruction efficiency were found to be in good agreement with the experimental values (R2 = 0.9810, Adjusted R2 = 0.9643). The results of the optimization predicted by the model showed that the maximum decolorization efficiency (>98%) was achieved at the optimum conditions of the reaction time 10 min, initial dye concentration 10 mg/l, initial peroxydisulfate concentration 1.5 mmol/l and distance of UV lamp from the solution 6 cm. The figure-of-merit electrical energy per order (EEo) was employed to estimate the electrical energy consumption and related treatment costs.
    Źródło:
    Polish Journal of Chemical Technology; 2009, 11, 4; 38-45
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization and equilibrium studies of Pb(II) removal by Grewia Asiatica seed: a factorial design approach
    Autorzy:
    Siyal, A. N.
    Memon, S. Q.
    Khaskheli, M. I.
    Powiązania:
    https://bibliotekanauki.pl/articles/778329.pdf
    Data publikacji:
    2012
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    optymalizacja
    usuwanie Pb(II)
    odpady nasion Grewiii
    metodologia powierzchni odpowiedzi
    badania równowagi
    biosorpcja
    optimization
    Pb(II) removal
    Grewia seed waste
    response surface methodology
    factorial design
    equilibrium studiem
    biosorption
    Opis:
    This study aims to explore the efficiency of an agro waste material for the remediation of Pb(II) contaminated water. A factorial design approach is adopted to optimize removal efficiency and to study the interaction between effective variables. A face-centered Draper-Lin composite design predicted 100% removal efficiency at optimum variables; pH 8, initial concentration of Pb(II) ion 12mg/L, sorbent dose 200mg and agitation time 110 min. Regration coefficient (R2 = 99.9%) of a plot of the predicted versus the observed values and p value (>0.05) confirms the applicability of the predicted model. Langmuir and Dubinin-Radushkevich (D-R) isotherm models were applicable to sorption data with the Langmuir sorption capacity of 21.61š0.78 mg/g. The energy of sorption was found to be 13.62š0.32 kJ/mol expected for ion-exchange or chemisorption nature of sorption process. Characterization of Grewia seed suggested a possible contribution of carboxyl and hydroxyl groups in the process of biosorption. The present study shows that Grewia seeds can be used effectively for the remediation of Pb(II) contaminated water.
    Źródło:
    Polish Journal of Chemical Technology; 2012, 14, 1; 71-77
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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