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    Wyświetlanie 1-5 z 5
    Tytuł:
    Towards a viable method of reusing silicon carbide. Physicochemical analyses in the studies on the industrial application of the material
    Autorzy:
    Niemczyk-Wojdyla, Anna
    Fornalczyk, Agnieszka
    Willner, Joanna
    Zawisz, Rafał
    Powiązania:
    https://bibliotekanauki.pl/articles/2032847.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    silicon carbide
    X-ray spectroscopy
    Acheson process
    węglik krzemu
    spektroskopia rentgenowska
    proces Achesona
    Opis:
    The paper presents an investigation on the feasibility of recovery of the highly valuable silicon carbide (SiC) from the slurry waste generated from silicon wafer production in the photovoltaic and semiconductor industry. Compared to the other techniques of recycling, a facile and low-cost method of waste treatment via heat drying followed by low-energy mixing in a shaker mixer was proposed. As the result of the treatment, the slurry waste was converted into a powdered form with dominant content of SiC. Separated SiC material was characterized by scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray powder diffraction, and sieve analysis. In addition, analyses of the bulk density, moisture content and melting test were carried out. As was confirmed by the physicochemical analyses, the dominant sieve fraction was in the range of 0.1-0.06 mm, the purity level was a minimum 99% mass of SiC, the moisture content - 0.3%, the bulk density - 1.3 g/cm3. The physicochemical characteristics of the material were crucial for understanding the material performance, assessment of the material quality and determining the perspective directions of the industrial application. The studies revealed that the material exhibited a high application potential as abrasive, especially in abrasive grinding and waterjet cutting.
    Źródło:
    Environment Protection Engineering; 2021, 47, 4; 43-52
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Plant nucleoside 5-phosphoramidate hydrolase; simple purification from yellow lupin (Lupinus luteus) seeds and properties of homogeneous enzyme
    Autorzy:
    Guranowski, Andrzej
    Wojdyła, Anna
    Rydzik, Anna
    Stepiński, Janusz
    Jemielity, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/1039966.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    yellow lupin
    Lupinus luteus
    adenosine 5'-phosphoramidate
    purification to homogeneity
    nucleoside 5'-phosphoramidase
    Opis:
    Adenosine 5'-phosphoramidate (NH2-pA) is an uncommon natural nucleotide of poorly understood biochemistry and function. We studied a plant enzyme potentially involved in the catabolism of NH2-pA. A fast and simple method comprising extraction of yellow lupin (Lupinus luteus) seed-meal with a low ionic strength buffer, ammonium sulfate and acetone fractionations, removal of contaminating proteins by heat denaturation, and affinity chromatography on AMP-agarose, yielded homogenous nucleoside 5'-phosphoramidase. Mass spectrometric analysis showed that the lupin hydrolase exhibits closest similarity to Arabidopsis thaliana Hint1 protein. The substrate specificity of the lupin enzyme, in particular its ability to split the P-S bond in adenosine 5'-phosphorothioate, is typical of known Hint1 proteins. Adenosine 5'-phosphofluoride and various derivatives of guanosine 5'-phosphoramidate were also substrates. Neither common divalent metal cations nor 10 mM EDTA or EGTA affected the hydrolysis of NH2-pA. The enzyme functions as a homodimer (2 × 15 800 Da). At the optimum pH of 7.0, the Km for NH2-pA was 0.5 µM and kcat 0.8 s-1 (per monomer active site). The properties of the lupin nucleoside 5'-phosphoramidase are compared with those of its counterparts from other organisms.
    Źródło:
    Acta Biochimica Polonica; 2011, 58, 1; 131-136
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hint2, the mitochondrial nucleoside 5-phosphoramidate hydrolase; properties of the homogeneous protein from sheep (Ovis aries) liver
    Autorzy:
    Bretes, Ewa
    Wojdyła-Mamoń, Anna
    Kowalska, Joanna
    Jemielity, Jacek
    Kaczmarek, Renata
    Baraniak, Janina
    Guranowski, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/1039587.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    Hint1
    Hint2
    histidine triad nucleotide binding proteins
    purification to homogeneity
    nucleoside 5'-phosphoramidase
    Opis:
    Adenosine 5'-phosphoramidate (NH2-pA) is a rare natural nucleotide and its biochemistry and biological functions are poorly recognized. All organisms have proteins that may be involved in the catabolism of NH2-pA. They are members of the HIT protein family and catalyze hydrolytic splitting of NH2-pA to 5'-AMP and ammonia. At least five HIT proteins have been identified in mammals; however, the enzymatic and molecular properties of only Fhit and Hint1 have been comprehensively studied. Our study focuses on the Hint2 protein purified by a simple procedure to homogeneity from sheep liver mitochondrial fraction (OaHint2). Hint1 protein was also prepared from sheep liver (OaHint1) and the molecular and kinetic properties of the two proteins compared. Both function as homodimers and behave as nucleoside 5'-phosphoramidate hydrolases. The molecular mass of the OaHint2 monomer is 16 kDa and that of the OaHint1 monomer 14.9 kDa. Among potential substrates studied, NH2-pA appeared to be the best; the Km and kcat values estimated for this compound are 6.6 μM and 68.3 s-1, and 1.5 μM and 11.0 s-1 per natively functioning dimer of OaHint2 and OaHint1, respectively. Studies of the rates of hydrolysis of different NH2-pA derivatives show that Hint2 is more specific towards compounds with a P-N bond than Hint1. The thermostability of these two proteins is also compared.
    Źródło:
    Acta Biochimica Polonica; 2013, 60, 2; 249-254
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Możliwości zastosowania procesów adsorpcyjnych i membranowych do zatężania metanu pochodzącego z powietrza wentylacyjnego kopalń
    Adsorption and membrane processes for the enrichment of methane in mine ventilation air
    Autorzy:
    Tańczyk, Marek
    Janusz-Cygan, Aleksandra
    Pawlaczyk-Kurek, Anna
    Jaschik, Jolanta
    Wojdyła, Artur
    Sołtys, Elżbieta
    Powiązania:
    https://bibliotekanauki.pl/articles/27324063.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Instytut Inżynierii Chemicznej PAN
    Tematy:
    metan z powietrza wentylacyjnego kopalń
    adsorpcja zmiennociśnieniowa
    separacja membranowa
    ventilation air methane (VAM)
    pressure swing adsorption
    membrane separation
    Opis:
    Przeprowadzono analizę metod adsorpcyjnych i membranowych pod kątem zatężania metanu w powietrzu wentylacyjnym kopalń (VAM). Stwierdzono, że możliwe jest zwiększenie stężenia VAM z 0,2-0,3% obj. do co najmniej 1% obj. przy wykorzystaniu obu technik separacyjnych, co powinno ułatwić jego utylizację w reaktorach rewersyjnych lub silnikach na paliwo ubogie.
    Technologies for thermal utilization of ventilation air methane (VAM) require stabilization and/or increasing its concentration. This paper summarizes the results of research conducted at the IICh PAS in the area of adsorption and membrane processes for VAM enrichment. First of all adsorbents and membrane materials were selected and investigated for such processes. They were assessed in terms of CH4/N2 selectivity, as defined by Eqs 1 and 2, as well as adsorption capacity (adsorbents) and permeability (membranes). The properties of activated carbons and ZMS 5A investigated were presented in Table 1 and Fig. 1. In the case of membranes polyimide membranes, used in commercial UMS-A5 and CO-C05 UBE modules, as well as the Matrimid 5218/CMS composite membrane, were selected for membrane VAM enrichment process. The pressure swing adsorption process in two-bed (Fig. 2) and four-bed (Fig. 4) installations for VAM enrichment was also investigated. The process performance was presented in Fig. 3 and Figs 5-6, respectively. It has been found that in the case of the four-bed process with activated carbon G2X7/12 Takeda VAM can be enriched from 0.2 to over 1.2 vol.% with a recovery of at least 80%. The results of membrane VAM enrichment processes were summarized in Table 2. It was found that in the case of commercially available UBE modules UMS-A5 and CO-C05 the concentration of methane in VAM can be increased from 0.3 to 0.43 vol.% with moderate CH4 recovery (50-60%). Higher enrichment (up to 1,8 vol.% in a three-stage system) can be obtained in the case of the hybrid Matrimid 5218/CMS. For an assessment of the energy efficiency of the PSA and membrane enrichment processes two factors were defined: the unit power necessary to generate the pressure ratio pW/pN in the separation process (Eq. 3) and the unit heat output of the ventilation air (Eq. 4). These factors were presented in Fig. 7 along with unit thermal power of the enriched gas for the membrane (triangles) and adsorption (diamonds) VAM enrichment processes. It was found that regardless of the separation method and process parameters, the potential energy gain from the utilization of enriched VAM is much lower than the energy expenditure related to the implementation of the enrichment process, which is primarily due to the low unit thermal power of the ventilation air.
    Źródło:
    Prace Naukowe Instytutu Inżynierii Chemicznej Polskiej Akademii Nauk; 2022, 26; 17--36
    1509-0760
    Pojawia się w:
    Prace Naukowe Instytutu Inżynierii Chemicznej Polskiej Akademii Nauk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Realne możliwości utylizacji metanu z powietrza wentylacyjnego kopalń węgla kamiennego z odzyskiem energii
    Feasible prospect of methane removal from ventilation air of coal mine with energy recovery
    Autorzy:
    Gosiewski, Krzysztof
    Pawlaczyk-Kurek, Anna
    Manfred, Jaschik
    Wojdyła, Artur
    Kleszcz, Tadeusz
    Machej, Tadeusz
    Michalski, Leszek
    Powiązania:
    https://bibliotekanauki.pl/articles/2175685.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Instytut Inżynierii Chemicznej PAN
    Tematy:
    spalanie termiczne
    metan
    reaktor rewersyjny
    thermal combustion
    methane
    reversal reactor
    Opis:
    Omówiono problemy utylizacji niskostężonego metanu emitowanego z powietrzem wentylacyjnym kopalń węgla kamiennego do atmosfery. Dokonano krótkiego przeglądu proponowanych w literaturze metod takiej utylizacji, ze szczególnym uwzględnieniem aspektów realizacji przemysłowej na obiektach w dużej skali. Praca obejmuje doświadczenia IICh PAN w omawianej dziedzinie zarówno eksperymentalne jak i symulacyjne.
    The problems related to the utilization of low-concentration methane emitted with the ventilation air from coal mines into the atmosphere are discussed. A short review of the methods of such utilization proposed in the literature was made, with particular emphasis on the aspects of industrial implementation on large-scale facilities. The work includes the experimental and simulation experiences of ICE PAS in the thermal combustion of methane in a flow reversal reactor.
    Źródło:
    Prace Naukowe Instytutu Inżynierii Chemicznej Polskiej Akademii Nauk; 2021, 25; 75--119
    1509-0760
    Pojawia się w:
    Prace Naukowe Instytutu Inżynierii Chemicznej Polskiej Akademii Nauk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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