Periodica Polytechnica Chemical Engineering最新文献_第4页

Analysis and Comparison of Gas Chromatographic Columns with Polyethylene Glycol Stationary Phase 气相色谱柱与聚乙二醇固定相的分析与比较

IF 1.3 4区工程技术

Periodica Polytechnica Chemical Engineering Pub Date : 2023-05-15 DOI: 10.3311/ppch.21481

G. Nyerges, Judit Mátyási, J. Balla

{"title":"Analysis and Comparison of Gas Chromatographic Columns with Polyethylene Glycol Stationary Phase","authors":"G. Nyerges, Judit Mátyási, J. Balla","doi":"10.3311/ppch.21481","DOIUrl":"https://doi.org/10.3311/ppch.21481","url":null,"abstract":"Gas chromatographic capillary columns with polyethylene glycol (PEG) stationary phase are very frequently used. Their polar character makes them able to analyze many molecules. Alcohols, ketones, aldehydes, and esters can be measured easily, but also molecules with acidic or alkaline characteristics can be separated. For these components, there are also acidic and alkaline modified PEG phases.When we want to buy a new column, we can choose from many manufacturers. Everyone tells us their column is the best, but we don’t know the real differences between these columns. It is because every manufacturer has its testing method under different circumstances and uses different test molecules. Also, they give us only a couple of information about the column, but that is not helpful in every case.We used an 8-component test mixture to compare the WAX columns of 6 manufacturers. The chromatogram lets us see the retention, resolution, and peak shape. We completed these parameters with the columns' efficiency and the sorption enthalpies and entropies of the analyzed compound. With these similar conditions, we can now compare the columns from different manufacturers and show more information about the columns to help the customer choose the best for the analysis.","PeriodicalId":19922,"journal":{"name":"Periodica Polytechnica Chemical Engineering","volume":"78 8 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2023-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87923011","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

CFD Investigation of Dry Tray Pressure Drop of Perforated Trays without Downcomer 无降管穿孔塔板干式塔板压降的CFD研究

IF 1.3 4区工程技术

Periodica Polytechnica Chemical Engineering Pub Date : 2023-05-12 DOI: 10.3311/ppch.21914

V. Kállai, P. Mizsey, G. Szepesi

引用次数: 0

The Application of Mathematical Modeling Tools in Optimizing the Purification Process of the Substance Oligohexamethyleneguanidine Hydrocitrate 数学建模工具在优化氢柠檬酸低聚亚甲基胍提纯工艺中的应用

IF 1.3 4区工程技术

Periodica Polytechnica Chemical Engineering Pub Date : 2023-05-12 DOI: 10.3311/ppch.21380

D. Shatalov, K. Trachuk, A. Aydakova, Diana Akhmedova, I. Ivanov, D. Minenkov, I. Blazhevich, Daria Kirillova, S. Kedik

引用次数: 0

Dry-column Vacuum Chromatographic Removal of Hg2+ from Wastewater Based on an Acridino-crown Ether-modified Spherical Silica Gel Adsorbent 基于吖啶酮冠醚改性球形硅胶吸附剂的干柱真空色谱法去除废水中的Hg2+

IF 1.3 4区工程技术

Periodica Polytechnica Chemical Engineering Pub Date : 2023-05-09 DOI: 10.3311/ppch.21563

Panna Vezse, János Attila Kalóczkai, D. Ster, L. Bezúr, Ádám Golcs, P. Huszthy, T. Tóth

{"title":"Dry-column Vacuum Chromatographic Removal of Hg2+ from Wastewater Based on an Acridino-crown Ether-modified Spherical Silica Gel Adsorbent","authors":"Panna Vezse, János Attila Kalóczkai, D. Ster, L. Bezúr, Ádám Golcs, P. Huszthy, T. Tóth","doi":"10.3311/ppch.21563","DOIUrl":"https://doi.org/10.3311/ppch.21563","url":null,"abstract":"Dry-column vacuum chromatographic technique is introduced for remediation of wastewater for the first time. A previously prepared chemically modified silica gel containing covalently immobilized Hg2+-selective acridino-crown ether selector molecules was used as an adsorbent. Removal of Hg2+ from highly contaminated river water was carried out to study practical applicability. Adsorption capacity, preconcentration factor, pH-sensitivity and selectivity in separation were determined. The adsorbent proved to be outstanding in selectivity, only Ag+ and Cu2+ interfered among 29 cations, was inert toward organic contaminants, exhibited regenerability and pH-independency between 3.0 ≤ pH ≤ 7.0. The proposed method showed a moderate efficiency in both adsorption (32 mg Hg2+ / 1 g adsorbent) and preconcentration (preconcentration factor of 100). A maximum 10 L of wastewater / 1 g adsorbent ratio is recommended as an upper limit for applicability. The described method showed a unique robustness and simplicity compared to conventional ion-chromatographic methods and an improved selectivity over physical interaction- or simple functional group-based adsorptions.","PeriodicalId":19922,"journal":{"name":"Periodica Polytechnica Chemical Engineering","volume":"32 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2023-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85388974","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synthesis and Characterization of Biphasic Calcium Phosphate Substituted Cerium as a Potential Osteoporotic Bone Filler 双相磷酸钙取代铈作为潜在骨质疏松性骨填料的合成与表征

IF 1.3 4区工程技术

Periodica Polytechnica Chemical Engineering Pub Date : 2023-03-28 DOI: 10.3311/ppch.21111

T. Windarti, L. Nulandaya, Widjijono Widjijono, N. Nuryono

{"title":"Synthesis and Characterization of Biphasic Calcium Phosphate Substituted Cerium as a Potential Osteoporotic Bone Filler","authors":"T. Windarti, L. Nulandaya, Widjijono Widjijono, N. Nuryono","doi":"10.3311/ppch.21111","DOIUrl":"https://doi.org/10.3311/ppch.21111","url":null,"abstract":"Biphasic calcium phosphate substituted cerium (BCP/Ce) is a potential material for osteoporotic bone filler. Synthesis of BCP/Ce was conducted by the sol-gel method. This work aimed to study the influence of cerium as a precursor on the crystal structures, surface properties, and agglomeration of BCP/Ce. A series of samples were prepared by various Ce percentages (0.5–16%) and a constant molar ratio of (Ca + Ce)/P = 1.2. A structural study by Rietveld refinement calculation confirmed that synthesis without Ce produced BCP that contained hydroxyapatite (HA) and β-tricalcium phosphate (β-TCP) at a ratio of 93:7. The presence of Ce increased β-TCP content to 73% for the use of Ce 8%. None of Ca in the HA structure was replaced by Ce. Otherwise, Ce replaced Ca in β-TCP structure by isomorphic substitution at the Wyckoff site of 6a (0,0,-0.085) or Ca (4) position. As the maximum occupancy of Ca (4) = 43%, about 17% of that was substituted by Ce for the use of 14% Ce. Ce was found in two states as Ce3+ and Ce4+ ions with Ce3+/Ce4+ ratio > 1. The presence of Ce on the particle surface caused a change in the particle shape, from plate-like to spherical. The particle size decreased to <100 nm with the increase of Ce content. The rise of Ce content in BCP decreased the luminescent property due to the increase of oxygen vacancies. The negative value of Zeta potential confirms that BCP/Ce surface can accommodate bone cell proliferation.","PeriodicalId":19922,"journal":{"name":"Periodica Polytechnica Chemical Engineering","volume":"137 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2023-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76743862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synthesis of PET-Magnesium Oxide-Chitosan Nanocomposite Membranes for the Dehydration of Natural Gas 天然气脱水用pet -氧化镁-壳聚糖纳米复合膜的合成

IF 1.3 4区工程技术

Periodica Polytechnica Chemical Engineering Pub Date : 2023-03-27 DOI: 10.3311/ppch.20729

O. Agboola, Grace Ayomide Oginni, Olagoke Oladokun, V. Efeovbokhan, A. O. Ayeni, A. Ayoola, Adedayo Adeyanju Adedamola, E. Alagbe, O. Fayomi, Lucey Moropeng, S.K. Ogunlade

{"title":"Synthesis of PET-Magnesium Oxide-Chitosan Nanocomposite Membranes for the Dehydration of Natural Gas","authors":"O. Agboola, Grace Ayomide Oginni, Olagoke Oladokun, V. Efeovbokhan, A. O. Ayeni, A. Ayoola, Adedayo Adeyanju Adedamola, E. Alagbe, O. Fayomi, Lucey Moropeng, S.K. Ogunlade","doi":"10.3311/ppch.20729","DOIUrl":"https://doi.org/10.3311/ppch.20729","url":null,"abstract":"Flat thin-film magnesium oxide-chitosan nanocomposite membranes were synthesized with polyethylene terephthalate (PET) and employed for natural gas dehydration. The water vapor permeation was most pronounced with a nanocomposite membrane doped with 0.9 g MgO nanoparticles (NP) as a result of a significant upsurge in the permeability of water vapor in the membrane (0.87). With the increase in MgO NP, large macro-voids are created, substratum pore size, and thickness together with the water vapor permeation were upsurged. The dehydration of natural gas performance of magnesium oxide-chitosan nanocomposite membranes synthesized with PET was enhanced with the increase in MgO NP embedded in the membrane. Though water vapor permeation was restricted by the polyester non-woven material used as a support for the nano composite membranes, as the three membranes did not reach the permeation coefficient of 1. However, the permeation coefficient increased with an increased MgO NP, with three mambrane samples (M1, M2 and M3) having permeation coefficient of 0.763, 0.77 and 0.87 respectively. The gas reduced with an increase MgO NP, with M1, M2 and M3 having 3.46×10−2, 3.17×10−2 and 3.88×10−3 kg/m3 respectively. From the adsorption study, the discrepancy observed between CH4 and vapor with isotherm models was ascribed to the different adsorption behavior of CH4 and vapor on the membrane-active area. The cost of making the membrane cannot be considered as a terminal criterion because most of the cost-effective option is not always the optimum one. The membranes confirmed their suitability for the dehydration of natural gas.","PeriodicalId":19922,"journal":{"name":"Periodica Polytechnica Chemical Engineering","volume":"47 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2023-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76127640","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modified Layered Double Hydroxide Mg/M3+ (M3+ = Al and Cr) Using Metal Oxide (Cu) as Adsorbent for Methyl Orange and Methyl Red Dyes 金属氧化物(Cu)作为甲基橙和甲基红染料吸附剂的改性层状双氢氧化物Mg/M3+ (M3+ = Al和Cr

IF 1.3 4区工程技术

Periodica Polytechnica Chemical Engineering Pub Date : 2023-03-27 DOI: 10.3311/ppch.21608

A. Wijaya, P. M. S. B. Siregar, A. Badri, N. Palapa, Amri Amri, N. Ahmad, A. Lesbani

{"title":"Modified Layered Double Hydroxide Mg/M3+ (M3+ = Al and Cr) Using Metal Oxide (Cu) as Adsorbent for Methyl Orange and Methyl Red Dyes","authors":"A. Wijaya, P. M. S. B. Siregar, A. Badri, N. Palapa, Amri Amri, N. Ahmad, A. Lesbani","doi":"10.3311/ppch.21608","DOIUrl":"https://doi.org/10.3311/ppch.21608","url":null,"abstract":"Mg/Cr-layered double hydroxide (Mg/Cr-LDH) and Mg/Al-layered double hydroxide (Mg/Al-LDH) intercalated metal oxide (Mg/Cr-Cu and Mg/Al-Cu) were synthesized by the co-precipitation method which is indicated by the X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and Brunauer Emmett Teller (BET) analysis. Mg/Cr-LDH intercalated metal oxide increased its surface area from 21.5 to 38.9 m2/g, while the surface area of Mg/Al-LDH from 23.2 to 30.5 m2/g. The adsorption capacity of Mg/Cr-Cu is 64.156 mg/g for methyl orange (MO) and 78.740 mg/g for methyl red (MR), and the adsorption capacity of Mg/Al-Cu is 97.087 mg/g for MO and 108.696 mg/g for MR. Equilibrium time on the adsorption process occurred at 90 minutes with adsorption kinetics followed by pseudo-second-order (PSO). The adsorption isotherm followed the Langmuir isotherm equation. Data of thermodynamic parameters indicate that the adsorption process in this study occurs spontaneously and endothermically. The regeneration results show that Mg/Cr-Cu and Mg/Al-Cu can be used for the 5 cycles regeneration process of MO and MR adsorption process. Interactions that occur between adsorbents and adsorbate include physical interactions, interactions with the involvement of hydrogen bonds, and electrostatic interactions.","PeriodicalId":19922,"journal":{"name":"Periodica Polytechnica Chemical Engineering","volume":"7 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2023-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88829922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Pressurized Liquid Extraction for the Recovery of Carotenoids and Functional Compounds from Green and Orange Dunaliella salina Biomasses 从绿色和橙色盐藻生物质中提取类胡萝卜素及其功能化合物的加压液萃取研究

IF 1.3 4区工程技术

Periodica Polytechnica Chemical Engineering Pub Date : 2023-03-27 DOI: 10.3311/ppch.21386

Hafsa Yaiche Achour, Cristina Blanco Llamero, Sid Ahmed Saadi, N. Bouras, A. Zitouni, J. Señoráns

{"title":"Pressurized Liquid Extraction for the Recovery of Carotenoids and Functional Compounds from Green and Orange Dunaliella salina Biomasses","authors":"Hafsa Yaiche Achour, Cristina Blanco Llamero, Sid Ahmed Saadi, N. Bouras, A. Zitouni, J. Señoráns","doi":"10.3311/ppch.21386","DOIUrl":"https://doi.org/10.3311/ppch.21386","url":null,"abstract":"In recent years, intensive research has been conducted on natural carotenoids extraction using several processes. Conventional extraction methods require high amounts of solvents and a long extraction time. However, pressurized liquid extraction demonstrated to be an interesting method. The extraction efficiencies of pressurized liquid for the recovery of carotenoids, from the green and the orange biomasses of the microalga Dunaliella salina DunaDZ1, are described. Organic solvents were tested including ethanol, n-hexane, ethyl acetate and a mixture of n-hexane:ethanol (3:4). Moreover, three extraction temperatures were used (90, 120 and 150 °C) at constant pressure. Extraction efficiency and extracts characterization were conducted. Results have shown that temperature has a positive effect on extraction yield. HPLC characterization showed that β-carotene is the main carotenoid in the orange biomass, and lutein in the green biomass, with the presence of other minor carotenoids in both biomasses. The highest carotenoid amounts were found in the n-hexane orange biomass extract, with β-carotene isomers as the main carotenoid (138.54 and 357.10 mg/g of dry extract, for cis and trans isomers, respectively). Otherwise, extracts obtained at the lowest tested temperature provided the best carotenoid yields. The best results for the antioxidant activity were obtained at 120 °C for orange biomass ethyl acetate extract.","PeriodicalId":19922,"journal":{"name":"Periodica Polytechnica Chemical Engineering","volume":"9 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2023-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73791735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Development of Dry Walnut Shell Edible Film Plasticized with Glycerol and/or Sorbitol and Incorporated with Aloe Vera Gel and Lemon Essential Oil 用甘油和/或山梨糖醇增塑并掺入芦荟凝胶和柠檬精油的干核桃壳食用膜的研制

IF 1.3 4区工程技术

Periodica Polytechnica Chemical Engineering Pub Date : 2023-03-27 DOI: 10.3311/ppch.21511

Berika Girgin, N. Tugrul

{"title":"Development of Dry Walnut Shell Edible Film Plasticized with Glycerol and/or Sorbitol and Incorporated with Aloe Vera Gel and Lemon Essential Oil","authors":"Berika Girgin, N. Tugrul","doi":"10.3311/ppch.21511","DOIUrl":"https://doi.org/10.3311/ppch.21511","url":null,"abstract":"Edible packaging films produced from biomaterials are environmentally friendly, promising alternatives against synthetic plastics films. The aim of this study was to produce a low-cost edible film from waste dry walnut shell by casting method. Effects of the plasticizer type and concentration, lemon essential oil (LEO) and aloe vera gel (AVG) addition on edible films properties were investigated. Produced edible films characterization analysis were realized by Scanning Electron Microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FTIR). Moisture content, water vapor transmission rate (WVTR), water solubility, swelling index, thicknesses and color parameters of the produced edible films were investigated. Moisture content of the films was decreased between 23.3–50.6% after LEO and AVG addition, except the moisture content of the film plasticized with 20% sorbitol was increased by 518%. WVTR of the films were increased between 8.7–72.3% after LEO and AVG addition due to the hydrophobic character of LEO. Glycerol plasticized edible films water solubility were decreased between 27.3–75.9%, sorbitol plasticized edible films water solubility were increased between 237.5–100.8% with LEO and AVG incorporation. The swelling index of C1 was reduced by 51.5%, C2 was reduced by 62.4%, C4 was reduced by 36.1%. The swelling index of the C3 was increased by 10.5%, C5 was increased by 21.5%. LEO and AVG addition increased to the film thickness maximum 79.2%. Total color changes (ΔE) of glycerol plasticized films were higher than sorbitol plasticized film. The edible film produced can be used in food packaging due to the appropriate physical and barrier properties.","PeriodicalId":19922,"journal":{"name":"Periodica Polytechnica Chemical Engineering","volume":"3 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2023-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90723712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Robustness Study of a Tensile Modulus Prediction Model for Semicrystalline Polymers 半结晶聚合物拉伸模量预测模型的鲁棒性研究

IF 1.3 4区工程技术

Periodica Polytechnica Chemical Engineering Pub Date : 2023-03-16 DOI: 10.3311/ppch.20991

Ali Zarbali, Balázs Pinke, A. Menyhárd

{"title":"Robustness Study of a Tensile Modulus Prediction Model for Semicrystalline Polymers","authors":"Ali Zarbali, Balázs Pinke, A. Menyhárd","doi":"10.3311/ppch.20991","DOIUrl":"https://doi.org/10.3311/ppch.20991","url":null,"abstract":"This work presents a robustness study of a previously developed empirical model that links Young's modulus to two key parameters of crystalline structure; crystallinity and lamellae thickness. The reliability of this modulus prediction model was tested by using different calorimeters and different polypropylene grades as well. Small samples were fabricated from injection-molded bars from different locations of the specimens in order to check the effect of structural inhomogeneity originated by the dynamic processing conditions. In addition, the standard deviation and consequently the accuracy of the prediction was tested by repeated calorimetric measurements. The crystalline structure and melting characteristics were measured by differential scanning calorimetry (DSC). The tensile properties of studied specimens were evaluated by standardized tensile tests. Although, the accuracy and reliability of the prediction model is dependent on the instrument used for thermal analysis, reasonably good agreement was found between the predicted and measured values in most cases. However, we may note that only well-calibrated calorimeters are suitable for reliable prediction of the modulus.","PeriodicalId":19922,"journal":{"name":"Periodica Polytechnica Chemical Engineering","volume":"28 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2023-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83321786","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0