PROCESS FOR THE PREPARATION OF A MESOPOROUS ALUMINA FROM A CONTINUOUSLY PREPARED DISPERSIBLE GEL AND WITHOUT GROWING DRYING

摘要

A process for preparing a mesoporous alumina comprising a) at least a first step of precipitating alumina, at least one basic precursor and at least one acid precursor in which at least one of the basic precursors is described. or acid comprises aluminum, at a pH of the reaction medium of between 6 and 10, at a temperature of between 40 and 95 ° C., said step a) being carried out without backmixing, b) a step of heat treatment of the suspension obtained at the end of step a) at a temperature of between 50 and 200 ° C., c) a filtration step of the suspension obtained followed by at least one washing step of the gel obtained, d) a step of removing at least a portion of the water of said alumina gel obtained at the end of step c) at a temperature below 50 ° C e) a step of shaping-extrusion formed with an acid level of between 0 and 4% and a neutralization rate of is between 0 and 100%, f) a heat treatment step at a temperature between 500 and 1000 ° C, in the presence or absence of a flow of air containing up to 60% by volume of water.