Hysteresis in the cyclic adsorption of acetone, ethanol and ethyl acetate on activated carbon

• Tipo: Artigo em Revista Científica Internacional
• Data: 2000

Autores

Luis Gales (Autor) ICBAS; Adélio Mendes (Autor) FEUP; Carlos Costa (Autor) FEUP

Revista

Título: Carbon

Vol. 38 Nº 7

Páginas: 1083-1088

ISSN: 0008-6223

Editora: Elsevier

Indexação

ISI Web of Knowledge - 52 Citações

ISI Web of Science

Scopus - 51 Citações

COMPENDEX

Classificação Científica

CORDIS: Ciências Físicas > Química > Química orgânica > Quimica do carbono

Outras Informações

ID Authenticus: P-001-18C

DOI: 10.1016/s0008-6223(99)00224-9

Abstract (EN): This paper describes the adsorption behaviour of three solvents (ethyl acetate, ethanol and acetone) on BASF activated carbon at various temperatures (15-80 degrees C). The adsorption isotherms show hysteresis which persists to very low pressures (Low Pressure Hysteresis, LPH). After prolonged outgassing (<10(-2) mbar) at 473-523 K we found that LPH still remains. This LPH is more pronounced for ethyl acetate at higher temperatures. Due to its importance on Pressure Swing Adsorption (PSA) units design and operation we discuss the adsorption behaviour when adsorption/desorption cycles are applied. We concluded that after approximately five cycles the system reaches what we called 'limiting isotherm' where adsorption and desorption branches cannot be distinguished within experimental error. This isotherm is independent of system history if a sufficiently low pressure and/or a sufficiently high pressure is used for cycling and in these conditions the adsorbent has higher capacity than when fresh. Also the Langmuir equation correlates quite well with the limiting isotherms.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 6