Recebido em 18/5/04; aceito em 13/12/04; publicado na web em 13/4/05 CO 2 SEPARATION BY THE PRESSURE SWING ADSORPTION TECHNIQUE. This paper describes the separation of CO 2 from a gas mixture containing 25% CO 2 , 4% O 2 and 71% N 2 using the pressure swing adsorption (PSA) technique. The adsorbent selected was the zeolite 13X due to its great adsorption capacity for CO 2 and selectivity towards the other components of the gas mixture. The experimental technique was designed to identify the most important variables for the process and to optimize it. It is shown that the PSA technique can be used to separate CO 2 from O 2 and N 2 to obtain an effluent containing 2% CO 2 with 99% separation efficiency.

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The aim of this paper is to determine the effect of adding 0.1 wt% of "synthetic termite saliva" on a fine and clayey sand latosol (76.5% sand) from the region of Bauru, SP (Brazil), stabilized with 1% to 3% of cement. Compacted cylindrical specimens (with standard Proctor energy) were tested to determine their compressive strength and water absorption. The results indicate that the use of the chemical stabilizer increased by at least 35% the compressive strength and reduced by up to 13% the water absorption of the samples. This work contributes to efforts aimed at reducing the consumption of cement through the production of stabilized compressed earth blocks and bricks (CEB) and rammed earth.