37 research outputs found
Evaluation of possibility of microwave heating utilization for dehydration of glycols used in natural gas mining
W pracy om贸wiono absorpcyjne sposoby osuszania gazu ziemnego z wykorzystaniem glikoli oraz problematyk臋 regeneracji nasyconych wod膮 glikoli, kt贸rej celem jest przywr贸cenie im pierwotnych w艂a艣ciwo艣ci sorpcyjnych. Podj臋to pr贸b臋 odwadniania glikoli w polu promieniowania mikrofalowego. Wyniki wst臋pnych bada艅 wskazuj膮, 偶e przy w艂a艣ciwym doborze parametr贸w procesu (moc promieniowania, czas i temperatura procesu) mo偶liwe jest osi膮gni臋cie wysokiej skuteczno艣ci regeneracji. Celowe wydaj膮 si臋 dalsze prace nad optymalizacj膮 procesu i dostosowaniem ogrzewania tego typu do warunk贸w przemys艂owych z uwzgl臋dnieniem uwarunkowa艅 ekonomicznych procesuMethods of regeneration of glycols from natural gas dehydration were analysed. The aim of experiment was an application of microwave radiation for used glycols dehydration. Microwave radiation is a promising method for introducing energy into reactive systems. Liquids can be heated by converting electromagnetic energy into thermal energy. Microwave heating offers many advantages over conventional one such as: non-contact rapid and volumetric heating; selective heating; heating start from interior of the materia
Improvement of Commercial Active Carbon for Use in an Adsorption Cooling System
Of the various gas/solid adsorption processes, the adsorption of methanol on active carbon seems to be most interesting for use in thermodynamic systems such as heat pumps and transformers, as well as in cooling systems. The porous structures of two series of active carbons modified by the successive removal of the external layers from the particle surface, one by abrasion in a spouted bed and the other by subsequent demineralization of the abraded particles, were evaluated on the basis of nitrogen and methanol adsorption data. The porous structure parameters for these two sorbate series agreed reasonably well and allowed the D鈥揜 approach to be usefully applied for the characterization of these systems. The methods for calculating the heat effects associated with methanol adsorption over wide ranges of temperature and pressure are discussed
Preformed Zeolite Products to be Used in Adsorption Heat Pumps. Part 1. Preparation Methodology and Adsorption Measurements
Recent results on adsorption heat pumps have indicated the technical feasibility of these types of systems, although the problems related to the inefficient thermal transmission between the external energy vector and the solid adsorbent still remain. In order to solve these problems, a prefixed-shaped form of the solid adsorbent has been prepared by a patented procedure developed in this Institute. In the present paper the preparation methodology, the material and the adsorption measurements are described
Adsorption Characteristics of Powders of Nanometric Gallium Nitride and Aluminium Nitride
The results of studies on new precursors for the preparation of gallium nitride and aluminium nitride were presented. The samples obtained were characterised by argon adsorption at 77 K. The variation of the porous structure parameters with the pyrolysis temperature was discussed. The adsorption of water vapour and the selectivity of adsorption with respect to some gases at 298 K were also investigated
Struktura porowata w臋gli aktywnych z odpadowych tworzyw sztucznych
Activated carbons are widely used in gas purification and separation, solvent recovery, wastewater treatment, etc. It is recognized that the pore structure is the most important property of activated carbons for their application in adsorption processes. Many investigations have been performed to explore novel raw materials (such as waste polymers) and to optimize the preparation conditions to obtain activated carbons with the desired porous properties. In this paper the preparation and characterization of activated carbons from poly(ethylene terephtalate), poly(methylene methacrylate), phenol/formaldehyde resin and coal-tar pitch was studied. The influence of the mass ratio pitch/polymer, carbonization conditions, as well as the activation agent used (steam, carbon dioxide, potassium hydroxide) on the characteristics of the samples were considered. The textural characteristics were studied by adsorption of gases and vapors. These allow to establish the influence of the experimental treatment parameters in the porous network of the samples. Moreover, the analysis of the adsorption data has been carried out by BET and Dubinin-Radushkevich (DR) equations as well as by the Monte Carlo (MC), Density Functional Theory (DFT) and Barrer-Joyner-Halenda鈥檚 methods. The results of these analysis were very consistent and permuted to determine the porous structure of the samples and also to identify the individual adsorption mechanism.Zwi臋kszaj膮ca si臋 ilo艣膰 odpadowych tworzyw sztucznych stwarza wiele istotnych problem贸w technicznych, ekologicznych i ekonomicznych. Konieczno艣膰 rozwi膮zywania powy偶szych problem贸w narzucaj膮 tak偶e obowi膮zuj膮ce przepisy prawne. Interesuj膮cym z poznawczego i utylitarnego punktu widzenia kierunkiem zagospodarowania niekt贸rych odpad贸w polimerowych jest wytwarzanie z nich adsorbent贸w w臋glowych. Wysokie ceny i zmniejszaj膮ca si臋 dost臋pno艣膰 tradycyjnych 藕r贸de艂 surowcowych do produkcji adsorbent贸w w臋glowych powoduj膮 zainteresowanie mo偶liwo艣ciami produkcji adsorbent贸w w臋glowych z surowc贸w ta艅szych lub odpadowych (drewno, 偶ywice jonowymienne, zu偶yte opony samochodowe, tworzywa sztuczne). Produkcja adsorbent贸w w臋glowych w powi膮zaniu z udoskonalaniem metod karbonizacji, aktywacji i modyfikacji mo偶e stanowi膰 alternatywn膮 drog臋 utylizacji tego typu odpad贸w. W pracy podj臋to pr贸b臋 wykorzystania odpadowego poli(tereftalanu etylenu), poli( metakrylanu metylu) i 偶ywicy fenolowo-formaldehydowej oraz paku w臋glowego do otrzymywania adsorbent贸w w臋glowych. Seri臋 kompozycji pakowo-polimerowych o r贸偶nym stosunku masowym pak/polimer poddawano karbonizacji w r贸偶nych warunkach (szybko艣膰 ogrzewania, ko艅cowa temperatura karbonizacji, czas utrzymywania pr贸bki w ko艅cowej temperaturze karbonizacji), a nast臋pnie aktywacji przy u偶yciu r贸偶nych czynnik贸w aktywuj膮cych (para wodna, ditlenek w臋gla, alkalia). Tekstur臋 porowat膮 uzyskanych pr贸bek scharakteryzowano na podstawie pomiar贸w izoterm adsorpcji i desorpcji par azotu (77 K) oraz izoterm adsorpcji ditlenku w臋gla (273 K), wyznaczaj膮c wielko艣膰 powierzchni w艂a艣ciwej BET, parametry struktury mikroporowatej (obj臋to艣膰 i rozk艂ad obj臋to艣ci mikropor贸w metod膮 Monte Carlo i Density Functional Theory), rozk艂ad obj臋to艣ci i powierzchni mezopor贸w wg Barrera-Joynera- Halendy. Wykazano, 偶e rodzaj surowca, warunki karbonizacji i aktywacji oraz rodzaj czynnika aktywuj膮cego umo偶liwiaj膮 otrzymanie adsorbentu w臋glowego o po偶膮danym z punktu widzenia potencjalnych zastosowa艅 rozk艂adzie por贸w