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Wyszukujesz frazę "intensification" wg kryterium: Temat


Wyświetlanie 1-5 z 5
Tytuł:
Evaluation of the absorbing pervaporation technique for ammonia recovery after the haber process
Autorzy:
Atlaskin, A.
Petukhov, A. N.
Yanbikov, N. R.
Salnikova, M.E.
Sergeeva, M. S.
Vorotyntsev, V. M.
Vorotyntsev, I. V.
Powiązania:
https://bibliotekanauki.pl/articles/184857.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
gas separation
absorbing pervaporation
ammonia
process intensification
membrane
separacja gazów
amoniak
intensyfikacja procesu
membrana
Opis:
A novel absorbing pervaporation hybrid technique has been evaluated experimentally for the recovery of ammonia from the gas mixture in a recycle loop of synthesis plants. This process of hybridization brings together the combination of energy-efficient membrane gas separation based on poly(dimethylsiloxane) poly(diphenylsilsesquioxane) with a high selective sorption technique where a water solution with polyethylene glycol 400 (PEG-400) was used as the liquid absorbent. Process efficiency was studied using the pure and mixed gases. The influence of PEG-400 content in aqueous solutions on process selectivity and separation efficiency was studied. The ammonia recovery efficiency evaluation of an absorbing pervaporation technique was performed and compared with the conventional membrane gas separation. It was shown that the absorbing pervaporation technique outperforms the conventional membrane method in the whole range of productivity, producing the ammonia with a purity of 99.93 vol.% using the PEG 80 wt.% solution. The proposed method may be considered as an attractive solution in the optimization of the Haber process.
Źródło:
Chemical and Process Engineering; 2018, 39, 3; 323--333
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Review on hierarchically microstructured monolithic reactors for high yield continuous production of fine chemicals
Autorzy:
Mrowiec-Białoń, J.
Ciemięga, A.
Maresz, K.
Szymańska, K.
Pudło, W.
Jarzębski, A. B.
Powiązania:
https://bibliotekanauki.pl/articles/184990.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
microreactors
in-flow synthesis
process intensification
nanostructured materials
mikroreaktory
synteza wewnątrzpłynna
intensyfikacja procesu
materiały nanostrukturalne
Opis:
Preparation and properties of hierarchically structured porous silica monoliths have been discussed from the viewpoint of their application as continuous microreactors for liquid-phase synthesis of fine chemical in multi kilogram scales. The results of recent topical papers published by two research teams of Institute of Chemical Engineering Polish Academy of Sciences (ICE) and Department of Chemical Engineering and Process Design, Chemical Faculty, Silesian University of Technology (SUT) have been analyzed to specify the governing traits of microreactors. It was concluded that even enhancement factor of 100 in activity, seen in enzyme catalyzed reactions, can be explained by a proportional reduction of its physical constraints, i.e. huge enhancement of external mass transfer and micromixing. It is induced by very chaotic flows of liquid in tens of thousands of waving connected channels of ca. 25–50 mm in diameter, present in the skeleton. The scale of enhancement in the caseof less active catalysts was smaller, but still large enough to consider the most practical applications.
Źródło:
Chemical and Process Engineering; 2018, 39, 4; 367--375
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computational Fluid Dynamics and Experimental Studies of a New Mixing Element in a Static Mixer as a Heat Exchanger
Autorzy:
Konopacki, M.
Kordas, M.
Fijałkowski, K.
Rakoczy, R.
Powiązania:
https://bibliotekanauki.pl/articles/185462.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mixing
heat transfer process
static mixer
CFD
process intensification
mieszanie
proces przenikania ciepła
mieszalnik statyczny
intensyfikacja
Opis:
The main aim of this work is to study the thermal efficiency of a new type of a static mixer and to analyse the flow and temperature patterns and heat transfer efficiency. The measurements were carried out for the static mixer equipped with a new mixing insert. The heat transfer enhancement was determined by measuring the temperature profiles on each side of the heating pipe as well as the temperature field inside the static mixer. All experiments were carried out with varying operating parameters for four liquids: water, glycerol, transformer oil and an aqueous solution of molasses. Numerical CFD simulations were carried out using the two-equation turbulence k-ω model, provided by ANSYS Workbench 14.5 software. The proposed CFD model was validated by comparing the predicted numerical results against experimental thermal database obtained from the investigations. Local and global convective heat transfer coefficients and Nusselt numbers were detrmined. The relationship between heat transfer process and hydrodynamics in the static mixer was also presented. Moreover, a comparison of the thermal performance between the tested static mixer and a conventional empty tube was carried out. The relative enhancement of heat transfer was characterised by the rate of relative heat transfer intensification.
Źródło:
Chemical and Process Engineering; 2015, 36, 1; 59-72
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Steam Reforming Catalyst Geometry on the Performance of Tubular Reformer – Simulation Calculations
Autorzy:
Franczyk, E.
Gołębiowski, A.
Borowiecki, T.
Kowalik, P.
Wróbel, W.
Powiązania:
https://bibliotekanauki.pl/articles/184862.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
tubular steam reforming
nickel catalyst geometry
process simulation
catalyst coking
process intensification
symulacja procesu
katalizator koksujący
intensyfikacja
Opis:
A proper selection of steam reforming catalyst geometry has a direct effect on the efficiency and economy of hydrogen production from natural gas and is a very important technological and engineering issue in terms of process optimisation. This paper determines the influence of widely used seven-hole grain diameter (ranging from 11 to 21 mm), h/d (height/diameter) ratio of catalyst grain and Sh/St (hole surface/total cylinder surface in cross-section) ratio (ranging from 0.13 to 0.37) on the gas load of catalyst bed, gas flow resistance, maximum wall temperature and the risk of catalyst coking. Calculations were based on the one-dimensional pseudo-homogeneous model of a steam reforming tubular reactor, with catalyst parameters derived from our investigations. The process analysis shows that it is advantageous, along the whole reformer tube length, to apply catalyst forms of h/d = 1 ratio, relatively large dimensions, possibly high bed porosity and Sh/St ≈ 0.30-0.37 ratio. It enables a considerable process intensification and the processing of more natural gas at the same flow resistance, despite lower bed activity, without catalyst coking risk. Alternatively, plant pressure drop can be reduced maintaining the same gas load, which translates directly into diminishing the operating costs as a result of lowering power consumption for gas compression.
Źródło:
Chemical and Process Engineering; 2015, 36, 2; 239-250
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Membrane gas separation module with pulsed retentate for low-permeable component recovery
Autorzy:
Battalov, Stanislav V.
Trubyanov, Maxim M.
Puzanov, Egor S.
Sazanova, Tatyana S.
Drozdov, Pavel N
Vorotyntsev, Ilya V.
Powiązania:
https://bibliotekanauki.pl/articles/185429.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
membrane gas separation
unsteady-state operation
process intensification
separation
efficiency
membrane module
separacja gazów membranowych
operacja niestabilna
intensyfikacja procesu
separacja
wydajność
moduł membranowy
Opis:
The paper presents the experimentalstudy of a novel unsteady-statemembrane gas separation approachfor recovery of a slow-permeant component in the membrane module with periodical retentate with-drawals. The case study consisted in the separation of binary test mixtures based on the fast-permeantmain component (N2O, C2H2) and the slow-permeant impurity (1% vol. of N2)using a radial counter-current membrane module. The novel semi-batch withdrawal technique was shown to intensify theseparation process and provide up to 40% increase in separation efficiency compared to a steady-stateoperation of the same productivity.
Źródło:
Chemical and Process Engineering; 2019, 40, 1; 57--65
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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