In order to use the alumina as a hydrogenation catalyst carrier, from AICl3 acid solutlon produced at the highpurity hydrogen generation to the laboratory level, aplying precipltation, filtration, whashlng and drying methods they were synthesized two types of products nominated as Alumina(I) and Alumina(II); these products were applied to the treatment of thermal transition phases and the obtained products were characterized by DRX. So, by calcinatlon for 5 h, they were obtained the following results: y-Al203 amorphous was formed from Alumina(I) at 500ºC, y-Al203 crystal structure with 0,9437 A size was produced at 11OOºC, x- Al20 3 was formad by Alumina(ll) calcination at 500ºC and 850ºC , a mixing of k-Al203 and a- Al20 3 phases were formed from Alumlna(II) at 1100ºC. On the other hand, calcinating by second time y-Al203 amorphous at 850 and 1100ºC far 5 h, they were formad y-Al2...

In order to use the alumina as a hydrogenation catalyst carrier, from AICl3 acid solutlon produced at the highpurity hydrogen generation to the laboratory level, aplying precipltation, filtration, whashlng and drying methods they were synthesized two types of products nominated as Alumina(I) and Alumina(II); these products were applied to the treatment of thermal transition phases and the obtained products were characterized by DRX. So, by calcinatlon for 5 h, they were obtained the following results: y-Al203 amorphous was formed from Alumina(I) at 500ºC, y-Al203 crystal structure with 0,9437 A size was produced at 11OOºC, x- Al20 3 was formad by Alumina(ll) calcination at 500ºC and 850ºC , a mixing of k-Al203 and a- Al20 3 phases were formed from Alumlna(II) at 1100ºC. On the other hand, calcinating by second time y-Al203 amorphous at 850 and 1100ºC far 5 h, they were formad y-Al2...

Se han llevado a cabo experimentos para la reacción de intercambio iónico entre soluciones de iones Cr2O7 2- y resina DOWEX 1X4. Se reporta la concentración de Cr+6 en función del tiempo para pesos de resina que varían entre 0.1 a 0.8 gramos, y para concentraciones iniciales de 50, 100 y 200 ppm. Los datos experimentales son correlacionados con los modelos de difusión cuasi homogéneo y de difusión controlada por la resistencia en la película. Los resultados experimentales indican que se requiere como mínimo un peso de resina igual a 0.75 gramos para reducir la concentración de Cr+6 a 1 ppm en un tiempo aproximado de 1 hora.

Experiments were carried-out for exchange reaction between ions dichromate Cr207 2- solution and resín type DOWEX 1X4. It is reported the concentration of Cr+6 versus raaction time for resin wetghts between O.1 to 0.8 grams and for initial concentrations of 50, 100 and 200 ppm. The experimental data are correlations with the models of homogeneous quasi ditfusion and diflusion control1ed by the liquid film resistance, The experiments show that is required a weight of resin equal to O, 75 grams to reduce the Cr+6 concentration to 1 ppm in 1 hours.

They have carried out experiments for the ion exchange reaction between ions Cr2O7 solutions and ion exchange resin in the chloride form. The concentration profile is reported in equivalent amounts of Cr +6 with time, for 0.1, 0.5 and 0.75 gram of resin. The results indicate that longer times are required at 2500 seconds to reduce the concentration to less than 1 ppm of Cr +6 in a volume of 250 ml of solution stirred at 250 rpm, with an initial concentration of 50 ppm and a weight of 0.75 grams resin.

They have carried out experiments for the ion exchange reaction between ions Cr2O7 solutions and ion exchange resin in the chloride form. The concentration profile is reported in equivalent amounts of Cr +6 with time, for 0.1, 0.5 and 0.75 gram of resin. The results indicate that longer times are required at 2500 seconds to reduce the concentration to less than 1 ppm of Cr +6 in a volume of 250 ml of solution stirred at 250 rpm, with an initial concentration of 50 ppm and a weight of 0.75 grams resin.