Wyniki wyszukiwania - BazTech

Ograniczanie wyników

1 2004

Znaleziono wyników: 1

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: rozdział gazów

Sortuj według:

Ogranicz wyniki do:

Dobór węglowych sit molekularnych do rozdziału wybranych mieszanin gazowych

Bałys M., Buczek B., Ziętkiewicz J.

Inżynieria i Ochrona Środowiska

2004

T. 7, nr 3/4

305-316

Porównano produkowane przemysłowo i wytwarzane laboratoryjnie węglowe sita molekularne pod kątem możliwości ich zastosowania do wydzielania metanu z mieszanin CH4/N2 w procesach kontrolowanych przez równowagę adsorpcyjną oraz sita molekularne do wydzielania metanu z mieszanin CH4/CO2 oraz azotu z powietrza w procesach kontrolowanych przez kinetykę adsorpcji. Badania obejmowały charakterystyki adsorpcyjne, badania izoterm adsorpcji metanu i azotu przy podwyższonych ciśnieniach, badania izoterm i kinetyk adsorpcji CO2 i metanu. Przeprowadzono także testy dynamiczne w laboratoryjnej aparaturze przepływowej. Na ich podstawie wytypowano adsorbenty o największej przydatności dla otrzymywania metanu w procesach adsorpcji zmiennociśnieniowej.

Selection of Carbon Molecular Sieves for Separation of Gas Mixtures Methane recovery from gaseous mixtures has both economical and ecological aspect. Methane from different waste gases like mine gases, nitrogenated natural gases and biogases can be treated as the local source for production electric and heat energy. And also occurs the problem of atmosphere pollution with CH4 that shows over 20 times more harmful environmental effect in comparison with CO2. One of the ways of utilisation such gases is enrichment in methane in the PSA process, which requires appropriate adsorbents. Carbon molecular sieves (CMSs) produced in industrial and laboratory scale were selected in terms of their application to the process of methane recovery: i) from mixtures CH4/N2 - in the process controlled by adsorption equilibrium; ii) from CH4/CO2 in the process controlled by kinetic of sorption. Additionally CMSs were used for separation N2 and O2 in the air mixure. For the first group of CMSs porous structures from isotherms of sorption of N2 at 77 K were calculated. Also isotherms of sorption of methane and nitrogen at elevated pressure and ambient temperature were measured. In the result the separation coefficient was calculated. Dependence of that coefficient on the microporous structure of adsorbents was discussed. For the second CMSs group investigation of isotherms and kinetics of CH4 and CO2 sorption were carried out. In the case of carbon molecular sieves separation process is controlled by two main factors stronger adsorption and faster diffusion of CO2. Separation abilities of the CMSs were checked in test apparatus in dynamic conditions. Methane concentration was measured in outflow gas during the step of constant pressure, cocurrent flow. Gas with 95% content of methane was obtained. Time in which concentration of methane in outlet rapidly decreases can be used as the parameter which differentiates adsorbents usability for separation processes.