No abstract

No abstract

Adsorption isotherms of toluene on activated carbon were measured by time integration of the breakthrough curves at 298.15 K and 308.15 K using an apparatus developed for this purpose. Isotherms were also measured at 318.15 K and 333.15 K using a microbalance. Activated carbon was used as the adsorbent because it typically exhibits high adsorption capacities and shows potential as an adsorbent to effectively remove volatile organic compounds (VOCs) such as toluene. The experimental data were correlated with the following adsorption isotherms: Langmuir, Freundlich, Toth, and Dubinin. All these models except the Langmuir model were able to correlate our data.

Re´sume´-Cine´tique du dioxyde de carbone avec les amines -I. É tude par stopped-flow en solution aqueuse. Une revue -Il est possible de trouver de nombreuses informations sur la cine´tique de re´action amine-CO 2 dans la litte´rature. Toutefois, comme il existe plusieurs techniques expe´rimentales et plusieurs me´canismes re´actionnels possibles, on observe parfois une grande dispersion des re´sultats expe´rimentaux avec diverses interpre´tations. Dans cet article, une me´thode qui permet de comparer les constantes cine´tiques obtenues par diffe´rents auteurs est propose´e. D'abord nous pre´sentons les diffe´rentes techniques expe´rimentales et justifions de comparer les donne´es obtenues par la technique d'e´coulement a`flux bloque´. Ensuite nous repre´sentons les donne´es cine´tiques des diffe´rentes amines e´tudie´es dans la litte´rature a`partir d'une de´pendance en loi puissance en fonction de la concentration. Cette repre´sentation illustre certaines relations structure-proprie´te´et permet de confronter les donne´es expe´rimentales aux diffe´rents me´canismes propose´s. Les avantages et limites de chaque me´canisme sont discute´s. Finalement nous justifions l'utilisation d'un mode`le termole´culaire pour comparer les donne´es obtenues par diffe´rents auteurs. Ce mode`le conduit a`l'observation d'un phe´nome`ne de compensation qui est un argument en faveur du me´canisme correspondant.Abstract -Kinetics of Carbon Dioxide with Amines. I. Stopped-Flow Studies in Aqueous Solutions. A Review -It is possible to find plenty of information about kinetics of reaction between amine and carbone dioxide in the literature. However, there are several experimental techniques and several possible mechanisms which lead to observe sometimes high dispersion of experimental results with various interpretations. A method which enables to compare kinetic constant got by different authors is proposed in this work. First, we present experimental techniques and justify comparison of data obtained by stopped-flow technique. Then, we plot kinetic data for all amines studied in the literature by a power law dependency with the concentration. This representation illustrates some structureactivity relationships and enables to confront experimental results with the different mechanisms. Advantages and limits of each mechanism are discussed. Finally, we justify the choice of the termolecular model to compare data got by different authors. This model leads to a compensation effect which is an argument in favour of this mechanism.