SciELO - Scientific Electronic Library Online

 
vol.80 número182INFLUENCE OF THICKNESS ON THE DRYING OF PAPAYA PUREE (Carica papaya L.) THROUGH REFRACTANCE WINDOWTM TECHNOLOGYCOMPARISON BETWEEN RESONANT-COLUMN AND BENDER ELEMENT TESTS ON THREE TYPES OF SOILS índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Artigo

Indicadores

Links relacionados

  • Em processo de indexaçãoCitado por Google
  • Não possue artigos similaresSimilares em SciELO
  • Em processo de indexaçãoSimilares em Google

Compartilhar


DYNA

versão impressa ISSN 0012-7353

Resumo

CORTES, FARID B.; ROJANO, BENJAMÍN  e  CHEJNE JANNA, FARID. ADVANTAGES AND THERMODYNAMIC LIMITATIONS OF THE EXPERIMENTAL SORPTION ISOSTERIC METHOD. Dyna rev.fac.nac.minas [online]. 2013, vol.80, n.182, pp.155-162. ISSN 0012-7353.

A review of advantages and thermodynamic limitations present in the sorption isosteric method (SIM) showed that SIM does not guarantee a constant adsorbed amount. Isosteres computed considering ideal gas behavior show that in SIM the mass of gas in the system dead volume increases as equilibrium pressure increases due to desorbed materials. SIM is useful and effective in obtaining highly accurate thermodynamic data for sorption of gases by microporous and nanoporous materials at low temperatures and pressures. At high temperatures and pressures desorption is not negligible, therefore SIM can not be applied. The errors in the calculation of the isosteric heat using SIM can be reduced using traditional experimental procedures such as adsorption isobars and isotherms to generate isosteres at high temperatures and pressures. Alternatively, corrections by pressure and temperature or an experiment that, after each temperature increase, allows gas dosage to compensate for the amount of mass desorbed would guarantee a constant adsorbed amount and, therefore, isosteric behavior by direct measurements.

Palavras-chave : sorption; isosteric method; isosteres; isotherms; isobars.

        · resumo em Espanhol     · texto em Espanhol     · Espanhol ( pdf )