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1
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Przemysł Chemiczny
2006 T. 85, nr 8-9 1092-1094
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Advances in Materials Science
EN This study presents the test results of Ti-46Al-7Nb-0.7Cr-0.1Si-0.2Ni alloy isothermal oxidation with regard to a coating of SiO2 deposited by the sol-gel method. The oxidation test was carried out in air at 900°C. The SiO2 coating is not an effective and stable diffusive barrier, which would consid[...]
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Przemysł Chemiczny
4
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Advances in Science and Technology Research Journal
EN Parameters of heating are understood as the conditions in which heating process is conducted to obtain the required steel properties. During the heating process, on the surface of heated elements, layer of scale is formed as a by-product,. The selection of appropriate heating parameters allows for a[...]
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Ochrona przed Korozją
2011 nr 6 306-307
PL Badano wpływ czasu utleniania na strukturę i skład chemiczny warstw ze stopu kobaltu wytworzonych metodą napawania laserowego. Do napawania użyto proszku o wysokiej zawartości chromu i średniej zawartości wolframu. Utlenianie przeprowadzono w temperaturze 1100°C w czasach od 15 minut do 50 godzin. P[...]
EN The influence of the oxidation time on the microstructure and chemical composition of the cobalt base laser clad layers was investigated. The powder used for cladding process contained high amount of chromium and medium amount of tungsten. The oxidations were carried on at 1100°C for times from 15 m[...]
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Polish Geological Institute Special Papers
2002 Vol. 7 159-168
EN The low temperature oxidation processes which has taken place in lignites and their lithotypes (xylain, humovitrain, semifusain, fusain and liptain) from the East Maritza basin have been studied. The changes occurring in the coals/lithotypes composition and structure during their oxidation have been[...]
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Przemysł Spożywczy
PL W artykule przedstawiono wymagania, jakie muszą spełniać przeciwutleniacze dopuszczone do stosowania w żywności. Omówiono ich skuteczność i zastosowanie w produktach spożywczych. Podano charakterystykę wybranych przeciwutleniaczy syntetycznych: galusanów, tert-butylohydrochinonu (TBHQ), butylohydro[...]
EN Requirements for antioxidants that have been allowed for use in food are presented in this article. Efficacy and application in food products are discussed. Characteristics of the selected synthetic antioxidants: gallates, tertiary--butyl-hydroquinone (TBHQ), butylated hydroxyanisole (BHA), butylate[...]
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Advances in Materials Science
EN Cobalt base clad layer underwent oxidation at 650° C and 750° C and corrosion in exhaust gases. The oxidation processes were run in two different ways; isothermal oxidation for 100 hours and cyc1ic oxidation for 200 hours. Corrosion in exhaust gases were run in a cyclic way for two month and about 2[...]
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Przemysł Chemiczny
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Przemysł Chemiczny
11
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Chemical and Process Engineering
PL Badano proces utleniania NO ozonem w skali laboratoryjnej, używając powietrza jako gazu nośnego dla NO. Ozon wytwarzano z osuszonego powietrza z wykorzystaniem generatora ozonu typu DBD. Temperaturę w reaktorze regulowano w zakresie od 17 stopni C do 170 stopni C, stosunek molowy O3/NO w zakresie 0,[...]
EN The process of NO pre-oxidation with ozone was studied in a laboratory apparatus using air as the carrier gas. Ozone was produced in dry air streams using a dielectric barrier discharge nonthermal plasma reactor. The temperature of the process was varied from 17 to 170 degrees C. The stoichiometric [...]
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Polish Journal of Chemistry
2007 Vol. 81, nr 11 1959-1962
EN A new mild and convenient method of oxidation of H-phosphinic to the corresponding phosphonic acids was developed. Conversion of H-phosphinic acids into trivalent trimethylsilyl esters using hexamethyldisilazane, followed by their oxidation with air and subsequent methanolysis al lowed obtaining the[...]
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Advances in Materials Science
EN Titanium alloys are widely used in various high strength and weight ratio applications, especially at elevated temperatures and increasingly as biomedical components. The formability can be circumvented by superplastic forming at elevated temperature, with its added forming advantages but certain mi[...]
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Polish Journal of Chemistry
EN The kinetics of oxidation of 8-hydroxyquinoline (oxine) by pyridinium dichromate has been studied in 60% acetic acid-water (v/v) medium. The reaction order is one with respect to oxidant, second with respect to the substrate and zero with respect to hydrogen ion concentration. Decrease of the dielec[...]
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Polish Journal of Chemistry
1998 Vol. 72, nr 12 2606-2609
EN During oxidation of n-butane to maleic anhydride on VPO catalysts phosphorus is carried out from the catalyst by gas phase. The transport medium is likely an organic compound of phosphorus. An active role of phosphorus in the n-butane transformation is suggested.
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Polish Journal of Chemistry
1998 Vol. 72, nr 10 2267-2271
EN The reaction between pyridinium chlorochromate and As(III) was studied in hydrochloric acid medium. The reaction was found to be overall second order the added product As(V) was found to decrease the rate. The hydrogen ion was found to catalyse the reaction and it was predicted that both protonated [...]
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Polish Journal of Chemistry
1998 Vol. 72, nr 10 2261-2266
EN The kinetics of oxidation of alpha-hydroxy acids (mandelic, lactic and glycolic) with a recently developed new mild Cr(VI) regent quinolinium fluorochromate (QFC) has been investigated in perchloric acid medium. First-order depedence with respect to [oxidant] is observed. Increase in [substrate] inc[...]
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Bulletin of the Polish Academy of Sciences. Chemistry
EN The oxidation kinetics of diphenyl, dialkyl and methyl phenyl sulphides has been investigated under pseudo-first-order conditions with quinolinium fluorochromate (QFC), a newly developed Cr(VI) reagent in acetonitrile medium. p- Toluene sulphonic acid (TsOH) is used for catalyzing the reaction. Init[...]
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Polish Journal of Chemistry
EN The main purpose of this study was to investigate the segregation and oxidation of phosphorus on the polycrystalline iron surface using the AES and XPS methods. The segregation of phosphorus begins at 600 K and the maximum concentration of phosphorus on the surface is achieved at 720 K, as in the ca[...]
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Polish Journal of Chemistry
1998 Vol. 72, nr 12 2583-2597
EN The electrooxydative polymerization of nickel complex of 1,5-diaminonaphthalene was performed in acetonitrile containing lithium perchlorate, using cyclic voltammetry and controlled potencial electrolysis. The film coated electrode showed an electroactive redox response in acidic solutions only. The[...]
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