engleski

Testing adsorbents for heat treatment of pipes

Heat treatment of pipes was performed in industrial conditions at 580 °C in a dry protective gas containing a CO2-CO-H2-N2 mixture. A commercial adsorbent (733 kg)used for production of the gas removed 52.7 l of water in five hours and 22.5 minutes. During the annealing of pipes oxidation and decarburization were not observed. The results were confirmed by metallographic analysis. The values of enthalpy of water desorption (36.4 - 40.5 kJ/mol)obtained by DSC and TGA measurements were close to those of water evaporation (44.1 kJ/mol). This suggests that the bonds between the water molecules and adsorbents were not of chemical but of physical nature.

adsorbents ; thermal analysis ; heat tratment ; water adsorption ; water desorption

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